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Effect of Foliar Fertilizer Application on Growth, Development and Yield of Mugwort (Artemisia vulgaris L.) and Talinum paniculatum (Jacq.) in Hanoi

Ninh Thi Phip, Ta Quang Kiet, Nguyen Thi Thanh Hai, Nguyen Phuong Mai

Date Received: 22-09-2020 / Date Accepted: 19-10-2020
Two experiments were designed to identify the effect of foliar fertilizer application on growth, development and yield of mugwort and Talinum paniculatum. Each experiment was arranged with 4 treatments (control; applying Komix; Dau trau 501; and growmore), the experiments were arranged in RCBD with 3 replications. The results showed that: spraying of foliar fertilizer increased the growth, development and yield of mugwort and T. paniculatumcompared to the control treatment. In particular, spraying of foliar fertilizer Dau trau 501 increases the height, number of leaves, the ability to branch, the net yield in both 2 plants (mugwort and T. paniculatum). At the 2ndcuttings of Mugwort, the leaf area index was the highest (3.9 m2leaf/m2of ground); individual leaves yield (19.3 g/plant) real leaves yield (23.9 quintal/ha), followed by spraying Komix and growmore reached 19.4 quintal/ha. For T. paniculatum, spraying Dau trau 501 obtained the shortens of harvesting time, the number of leaves, branches, leaf area index, the yield was much higher than that in the others in both 2 cutting times. In the first harvesting, the leaf area index reached 1.1 m2of leaves/m2of ground, the individual yield 19.5 g/plant and the real leaves yield reached 25.3 quintals/ha. In terms of aroma and taste, foliar fertilizer application increased the smell but less affected the taste of mugwort and T. paniculatum.
Effect of N, P, K Levels and Timing of Topdressing on Growth, Yield and Economic Efficiency of Mungbean Grown in Thanh Hoa Coastal Sandy Soils

Nguyen The Anh, Vu Dinh Hoa, Nguyen Thi Chinh

Date Received: 18-07-2017 / Date Accepted: 30-08-2017
Identifying optimal fertilizer rate and frequency and timing of nitrogen and potassium split application presents one of the nutrient management measures for improvement of mungbean yield on sandy soil in general and on coastal sandy soil in Thanh Hoa province in particular. In the present study, the effect of three NPK rates (LL1, LL2, and LL3) and frequency and timing of NK split applications (TD1, TD2, and TD3) on plant growth, grain yield and economic efficiency of two mungbean varieties were studied. Mungbean cultivars ĐX208 and ĐX16 were grown on coastal sandy soils in the districts of Nga Son and Hoang Hoa and Tinh Gia, respectively, in 2012 and 2013 summer cropping seasons. Plant growth and yield were influenced by the level of fertilizer, timing and frequency of nitrogen and potassium top dress application. For cv. ĐX208, highest fertilizer rate (LL3) resulted in high yield although not significant compared with the control. Fertilizer rate LL3 with TD3 split application resulted in better growth and significantly higher yield as compared with the control (TD1). However, LL2 with TD2 split application brought about highest yield and economic return for ĐX 2008, while for shorter growth duration cv. ĐX16, LL2 with TD2 split applcation resulted in highest yield and economic return.
Physiological Responses of Some Groundnut Cultivars to Salinity

Nguyen Thi Thanh Hai, Bui The Khuynh, Bui Xuan Suu, Vu Dinh Chinh, Ninh Thi Phip, Dinh Thai Hoang

Date Received: 21-03-2013 / Date Accepted: 24-06-2013 / Date Published: 13-06-2025
The pot experiment was conducted in net house to evaluate the effects of two salinity levels (NaCl 2‰ and 4‰) on the growth and yield of 6 local groundnut cultivars. The six groundnut cultivars are Sẻ Quảng Ngãi, Lạc, Lạc Quảng Trị, Mỏ két Tây Ninh, Giấy Tây Ninh, Đỏ Thái Bình. Results showed that salinity affected significantly growth and yield of groundnut. Increase in NaCl concentration decreased main stem height, dry matter weight, CO2 assimilation rate and triggered proline production in leaves of all cultivars. Besides, increase in level of salinity resulted in decrease of yield and yield components of groundnut. Among cultivars, Mo ket Tay Ninh obtained the highest pod yield at all salinity levels. In NaCl 4‰ treatment, the highest pod yield was found at Mỏ Két Tây Ninh (3.12g/plant), followed by Lạc Quảng Trị (3.04g/plant), Giấy Tây Ninh (3.03g/plant), Đỏ Thái Bình (2.79g/plant), Lạc (2.75g/plant) and Sẻ Quảng Ngãi (2.73g/plant), respectively. Among 6 varieties studied, Mo Ket Tay Ninh and Lac Quang Tri were believed to have good growth and yield performance and can be used as parental lines for salinity tolerance breeding in groundnut.
DOI: https://doi.org/10.31817/tckhnnvn.2013.11.3.
Evaluation of Growth, Biomass Potential and Seed Yield of Introduced Sunflower Accessions

Dinh Thai Hoang, Nguyen Thi Thanh Hai

Date Received: 07-11-2023 / Date Accepted: 26-01-2024 / Date Published: 12-06-2025
The study aimed to evaluate the growth, potentials of biomass, and seed yields of 40 s introduced sunflower accessions. The experiment was conducted in the Spring cropping season of 2023 at Gia Lam, Hanoi in a non-replicated field experiment. The result showed that the potential accessions for biomass yield belonged to medium and late maturity groups. Biomass yield had a positive correlation with leaf area. Seed yield correlated negatively with the number of heads/plant, and positively with head diameter, total seed numbers/head, and 1000-seed weight. The accessions “CA sunflower” (87.5 tons/ha), “Red Sun” (83.1 tons/ha), and “Roshia” (77.3 tons/ha) had higher biomass yield compared to the control “Aguara” 6 (76.3 tons/ha). “Sono” accession had a high biomass yield (73.9 tons/ha) and the highest seed yield (6.54 tons/ha).
DOI: https://doi.org/10.31817/tckhnnvn.2024.22.2.
Effects of Planting Density and Planting Pattern on Weed, Growth and Yield of Baby Corn

Trần Thị Thiêm, Nguyen Thi Loan, Thieu Thi Phong Thu

Date Received: 15-01-2025 / Date Accepted: 19-03-2025 / Date Published: 28-03-2025
This study was conducted to evaluate the effects of planting density and planting pattern on weed species, weed density and weed biomass, growth and cob yield of baby corn. The field experiment was conducted in 2020 spring in Gia Lam, Ha Noi using a split-plot design with three replications. The main plot was planting densities with four levels: 138,888 plants ha-1, 111,111 plants ha-1, 92,593 plants ha-1, and 79,365 plants ha-1. The sub-plot factor was two planting patterns: quadrate planting and triangular planting. The results showed that increasing planting density suppressed weed growth while increasing corn yield. However, the planting patterns did not affect the weed growth as well as the growth and yield of corn. With the same planting pattern, increasing planting density significantly reduced weed density and weed biomass, and increased yield of baby corn. The highest corn yield (1.69-1.77 tons/ha) was obtained at the planting density of 111,111-138,888 plants/ha combined with quadrate planting or triangular planting
DOI: https://doi.org/10.31817/tckhnnvn.2025.23.3.01
Comparison of Growth, Yield and Quality of Newly Hybrid Mulberry (Morus alba L) Combinations

Ha Thi Huong, Tong Thi Sen, Do Van Nguyen, Nguyen Thi Min, Phan Thi Thuy, Nguyen Hong Hanh

Date Received: 07-02-2025 / Date Published: 21-02-2025
The research was conducted to evaluate the morphological characteristics, growth, yield and quality of mulberry leaves of four new hybrid mulberry combinations in 2023 spring and autumn season. The field experiment was arranged in a Randomized Complete Block Design (RCBD) and included four newly hybrid mulberry combinations (THL1, THL2, THL3, THL4) and a control variety (GQ12) with three replications. The monitored indicators for mulberry included leaf morphology, leaf size, pest and disease status, and leaf yield. The quality of mulberry leaves was evaluated by rearing silkworms (Bombyx mori L.) in the laboratory. The laboratory experiment was arranged in a Completely Randomized Design (CRD), in which the leaves of each mulberry variety were equivalent to a silkworm rearing treatment. The silkworm evaluation parameters included the cocoon formation rate, single cocoon weight, cocoon shell weight, and cocoon yield per 300 silkworms. The results showed that THL1 had early germination time, and the level of damage caused by stem borers and powdery mildew disease of THL1 was equivalent to the control variety GQ12, but the leaf yield was 27.9% higher than that of the control variety in the autumn season. Silkworms fed mulberry leaves of THL1 had higher cocoon shell weight and cocoon yield from 3.3-13.8 % than those feeding mulberry leaves of GQ12. The results provide a basis for continuing to evaluate and develop THL1 to diversify sources of quality mulberry varieties to serve the sustainable and effective development of the mulberry industry.
DOI: https://doi.org/10.1234/g8k8r386
MUTAGENIC INDUCTION OF AGRONOMICAL AND YIELD CONTRIBUTING TRAITS IN SOYBEAN (GLYCINE MAX(L.)MERRILL) WITH GAMMA IRRADIATION

Vu Dinh Hoa, Nguyen Van Giang

Date Received: 14-05-2012 / Date Accepted: 21-09-2012 / Date Published: 13-06-2025
The effects of different doses of gamma rays (0, 15, 18, 21 kR) on mutagenic induction in soybean (Glycine max (L.) Merill) cv ĐVN6, ĐT12 and ĐT20 were investigated. The sensitivity response of soybean to gamma radiation was determined based on seed germination, plant survival and growth reduction in the M1 generation. The mutation changes were observed on the morphological and agronomic characters and yield components, including leaf color and shape, maturity, plant height, branching habit, number of branches per plant, pods/plant, 1000 seed weight and yield/plant in the M2, M3 and M4 generations. In general, the reduction of phenotypic expression in M1 generation is proportional with the dose of gamma irradiation. Although cultivars responded slightly different, the critical dose for inducing mutation was established at 21 kR. In M2 generation high proportion of chlorophyll and agro-morphological mutations were observed, indicative of effectiveness of mutagenic treatment. With regard to quantitative traits, both negative and positive shifts in mean values as well as increased phenotypic variation were recorded in M2, M3 and M4 generation as a result of mutagenic treatment. Moderate to high broad-sense heritabilities in the M3 generation were found for plant height, number of branches, number of pods per plant and seed weight, but rather low for grain yield per plant, suggesting possibility for improvement through selection of yield components. A total of 15 M4-lines possessing agronomic and yield contributing traits similar to or better than the parents were selected and they offer good scope for improvement of soybean.
DOI: https://doi.org/10.31817/tckhnnvn.2012.10.4.
EVALUATION OF PURPLE WAXY CORN LINES FOR HYBRID VARIETY DEVELOPMENT

Vu Van Liet, Pham QuangTuan, Nguyen TheHung, Nguyen Viet Long, Nguyen ThiNguyetAnh

Date Received: 01-12-2015 / Date Accepted: 20-03-2016 / Date Published: 12-06-2025
This study was carried out to evaluate and select superior purple waxy corn lines derived from self-pollination (S3to S6generation) with high grain yield, marketable fresh cob yield, anthocyanin content, good eating quality and desirable agronomical characteristics. These lines were extracted from exotic and domestic germplasm. Phenotypic data collected included growth and developmental characteristic, yield and yield components, marketablefresh cob yield, total anthocyanin content, eating quality, pericarp thickness, sugar content,tenderness and taste.. Eighteen purple waxy corn lines out of 45 lines were selected based on selection index computed from ideotype plant analysis with 12 traits. These lines had high anthocyanin content (22.4 to 260.10 µg/L), acceptable grain yield (2.0 to 3.5 t/ha) and marketable fresh cob yield (3.8 to 6.4 t/ha), good eating quality and suitable agronomical characteristics. These lines were recommended for further purple waxy corn inbred line and hybrid development.
DOI: https://doi.org/10.31817/tckhnnvn.2016.14.3.
Using Compositional Regression Models to Analyze the Relationship Between Weather and Provincial Rice Yield in Vietnam

Trinh Thi Huong

Date Received: 10-05-2024 / Date Accepted: 28-05-2024 / Date Published: 12-06-2025
Rice yield in Vietnam is heavily influenced by climate change, particularly weather patterns. This study aimed to examine the relationship between weather and provincial rice yield in Vietnam from 1987 to 2016. The weather data considered in this analysis included the maximum daily temperature for each province or cityand the total annual rainfall. The Red River Delta and Mekong Delta regions exhibited the highest levels of rice yield. To represent the temperature patterns across a given year, a compositional vector consisting of 28 dimensions was utilized. Using a compositional regression model, the highest daily temperatures with the greatest impact on rice yield fall within the range of 28°C-30°C. More specifically, the frequency of days within the year that temperatures fall within 28°C-29°C and 29°C-30°Chad the most significant effect on increasing rice yield in Vietnam. Under the climate change scenario RCP2.6, the projected rice yields for all ecological regions in the year 2099 are estimated lower than those in 2016. The climate scenarios RCP4.5, RCP6.0, and RCP8.5 showedheterogeneous impacts on the difference in rice yield in 2099 and 2016.
DOI: https://doi.org/10.31817/tckhnnvn.2024.22.5.
Studying some Technical Measures to Improve the Yield and Quality of Van Ban Pear Variety in Lao Cai Province

Vu Ngoc Lan, Nguyen Huy Duc, Tran Anh Tuan, Nguyen Thi Phuong Dung

Date Received: 31-10-2023 / Date Accepted: 07-03-2024 / Date Published: 12-06-2025
The Van Ban pear is a fruittreethat brings high economic efficiency to local peoplein Lao Cai province which was at risk of eroding precious genetic resources due to the traditional farming practices of mountain people. Aims to effectively exploit and sustainably develop this pear variety, 3 experiments were conducted, including (1) Study on the effects of fertilization treatmentson growth, yield and quality of Van Ban pear variety; (2) Study on pruning combined with pulling branches techniques on growth, yield and quality of Van Ban pear variety; (3) Study on the effects of some soil moisture retention measures on growth, yield and quality of Van Ban pear variety. Research results indicatedthat applying 1,200 kg/ha of Viet Nhat synthetic NPK fertilizer (15 : 15 : 15 + TE) gavea high fruiting rate (4.47%); large fruit (353.1 g/fruit), high yield (213.9 kg/tree. Pruning branches three times a year combined with pulling branches once increasedfruit setting rate, number of fruits/tree, productivity, fruit setting rate (4.73%), fruit size (349.9 g/fruit) andthe actual yield reached190.3 kg/tree.The most optimal treatment to retain moisture was plant matter’s addition to the soil, combined with applying AMS-1 moisturizing agent at an amount of 0.1kg/tree. Fertilizing and moisturizing as above had enhancd fruit quality (increased dry matter content, total sugar, brix and vitamin C content) of Van Ban pear variety.
DOI: https://doi.org/10.31817/tckhnnvn.2024.22.3.
Studying some Technical Measures to Improve the Yield and Quality of Van Ban Pear Variety in Lao Cai Province

Vu Ngoc Lan, Nguyen Huy Duc, Tran Anh Tuan, Nguyen Thi Phuong Dung

Date Received: 31-10-2023 / Date Accepted: 07-03-2024 / Date Published: 12-06-2025
The Van Ban pear is a fruittreethat brings high economic efficiency to local peoplein Lao Cai province which was at risk of eroding precious genetic resources due to the traditional farming practices of mountain people. Aims to effectively exploit and sustainably develop this pear variety, 3 experiments were conducted, including (1) Study on the effects of fertilization treatmentson growth, yield and quality of Van Ban pear variety; (2) Study on pruning combined with pulling branches techniques on growth, yield and quality of Van Ban pear variety; (3) Study on the effects of some soil moisture retention measures on growth, yield and quality of Van Ban pear variety. Research results indicatedthat applying 1,200 kg/ha of Viet Nhat synthetic NPK fertilizer (15 : 15 : 15 + TE) gavea high fruiting rate (4.47%); large fruit (353.1 g/fruit), high yield (213.9 kg/tree. Pruning branches three times a year combined with pulling branches once increasedfruit setting rate, number of fruits/tree, productivity, fruit setting rate (4.73%), fruit size (349.9 g/fruit) andthe actual yield reached190.3 kg/tree.The most optimal treatment to retain moisture was plant matter’s addition to the soil, combined with applying AMS-1 moisturizing agent at an amount of 0.1kg/tree. Fertilizing and moisturizing as above had enhancd fruit quality (increased dry matter content, total sugar, brix and vitamin C content) of Van Ban pear variety.
DOI: https://doi.org/10.31817/tckhnnvn.2024.22.3.
Effects of Combining Soil and Foliar Fertilization on Growth, Developmentand Yield ofEggplant

Thieu Thi Phong Thu, Tran Thi Thiem, Phung Xe Pa

Date Received: 06-12-2022 / Date Accepted: 27-03-2023
The experiment aimed to determine the suitable types of organic fertilizer for the growth, development and yield of eggplant in Gia Lam, HaNoi.Atwo-factor experiment was laid out in randomized complete block design comprising 8treatments with three replications. The first factor wassoil fertilization withP1 - Chicken manure, P2 - Minori fertilizer, P3 - Inorganic fertilizerandP4 - Vermicompost. The second factor wasfoliar organic fertilization with C1 - O-MIC and C2 - HB101 (plant vitalizer). Research results showed that vermicompost exhibitedthe best effectson the growth and yield of eggplant. Foliar application of HB101 brought better effectson the growth and yield of eggplant compared to application of O-MIC. Combined use of vermicompost and HB101 foliar vitalizer gave the highest eggplant yield of 14.05 tons/ha, 2.89 tons/ha higher than the yield in combination ofinorganic fertilizerandO-MIC and 2.39 tons/ha higher than the yield inthe combination ofinorganic fertilizerand HB101.
Effect of Biochar on Growth, Physiology and Yield ofGroundnut cv. L27under Saline Conditions

Ngo Thi Bich Hang, Le Thi Nga, Vu Ngoc Thang

Date Received: 29-11-2021 / Date Accepted: 05-04-2022
The research was conducted to evaluate the effect of biochar on growth, physiological traits and yield of groundnut cv. L27 under saline conditions. The two-factor experiment was arranged in a split-plot design. Factor 1 consisted of 4 rates of biochar (0, 5, 10, and 15 tons ha-1); factor 2 consisted of salinity and non-salinity conditions. The saline stress was imposed every three days for 30 days with 200 ml of 100mM NaCl solution at the flowering stage. The results showed that salinity significantly reduced growth and physiological parameters. Besides, salinity significantly increased the relative ion leakage and the water saturation deficit in the leaves resulting in reduced yield components and individual yield. The application of biochar improved growth and physiological parameters, yield components, and individual productivity in both salinity and non-salinity conditions. Comparison among biochar rates showed that the highest values of growth, physiological parameters, yield components, and individual productivity were observed in 10 tons biochar ha-1.
Influence of Nitrogen Fertilizer Rate on the Growth and Yield of Ly Son Garlic (Allium sativumL.) Plants in Sandy Soil at Quang Dien Commune, Thua Thien Hue Province

Phung Thi Bich Hoa, Pham Thanh

Date Received: 26-02-2020 / Date Accepted: 22-06-2020
Ly Son garlic (Allium sativumL.) is a high economic value crop. This is one of the first reports to evaluate the effect of nitrogen fertilizer application rate on the growth, development and yield of Ly Son garlic grown on the sandy soil inThua Thien Hue, Viet Nam. Four nitrogen fertilizer levelwere selected and tested in this study: 230kg N ha-1, 55kg N ha-1, 115kg N ha-1, 165kg N ha-1. Theresults showed that A. sativumwas suitable for growing and developing under the natural conditions of Thua Thien Hue. The growing duration of A. sativumranged from 120 to 145 days. Furthermore, the traditional fertilizer dosage (230kg N ha-1) gave the lowest yield;while, the nitrogen fertilizer level of 115kg N ha-1was the best treatment,which resulted inhigh yield and good growth in terms ofthe number of leaves per plant (6.1 leaves), pseudostem height (12.1cm), the weight of fresh bulb (5.73g), the weight of dry-bulb (0.45g) and the yield of A. sativum(6.03 t/ha), respectively. This result also demonstrated that the agro-biological characteristics, yield parameters such as bulb diameter and length, number of cloves per bulb of A. sativumplanted in that area have not been different comparing with the originally planted garlic grown in the areas of Ly Son, Quang Ngai province.
Effect of Planting Density and Fertilizer Level on Growth and Yield of the Potato Variety KT4 in Thanh Tri, Hanoi

Nguyen Thi Thu Huong, Tran Thi Thiem

Date Received: 26-08-2019 / Date Accepted: 10-10-2019
This study was conducted to evaluate the effects of planting density and fertilizer level on the growth and yield of the potato variety KT4 grown in Thanh Tri, Hanoi. The field experiment was a split-plot designwith three replications. Plant density was main factor with3 levels: 4 tubers/m2(M1), 5 tubers/m2(M2) and 6 tubers/m2(M3); the sub-factor consisted of three fertilizer levels(kg/ha): 120N: 120P2O5: 120K2O (P1); 150N: 150P2O5: 150K2O (P2); 180N: 180P2O5: 180K2O (P3). Theresults showed that there weresignificant differences(P≤0.05)in plant height, leaf area index, dry matter, yield components and tuber yield when plant density increased from M1 to M2 and fertilizer application level increased from P1 to P2. However,there was no significant differencesin the above parameters between M1 and M2 as well as between P2 and P3. In addition, the effect of interaction between plant density and fertilizer level was significant for tuber yield. The highest tuber yield (26.21-27.44 tons per ha-1)was found at M2 and M3 density combining with P2 and P3 fertilizer leves.
The Affect of Nitrogen Concentrations Applied and Plant Density onSome Physiological, Yield Trait of Waxy Maize HUA518

Duong Thi Loan, Vu Thi Bich Hanh, Nguyen Van Ha, Tran Thi Thanh Ha, Hoang Thi Thuy, Vu Van Liet

Date Received: 02-03-2016 / Date Accepted: 28-07-2016
This experiment was conducted to evaluate the effect ofnitrogen ratesand plant densities on physiological and yield characteristics of waxy maize cv. HUA518using two-factorial design. Nitrogen rates and plant densities did not clearly affect plant height, growth durations and ear height, except the case withoutnitrogen application. The posiste effect ofnitrogen ratesapplied and plant density, however, on leaf area index (LAI) and dry matter accumulation was apparent. These characteristics were closely correlated with yield atmilking stage in all nitrogen treatmentsduring both 2013 autumn -winter and 2014 spring seasons. Yield was affected most by density and fertilizer treatments.The nitrogen rate of 190 kg N/haplus90 kg P2O5and70 kg K2O/ha and the density at 57,000 -61,000 plants/ha gave the highest yield (yield 11-11.8 tons of fresh waxy maize/ha).
Nghiên cứu sinh trưởng, năng suất và ưu thế lai của các tổ hợp ngô bao tử

Nguyen Viet Long

Date Received: 06-01-2016 / Date Accepted: 22-05-2016
Nghiên cứu được tiến hành trong hai vụ ngô xuân năm 2014 và 2015 nhằm đánh giá sinh trưởng, năng suất và chất lượng của các dòng ngôbố mẹvà tổ hợp ngô bao tử và ưu thế lai một số tính trạng năng suất. Năm dòng bố mẹ và 07 tổ hợp lai cùng với 02 giống đối chứng (LVN23 là giống ngô bao tử lai được trồng phổ biến tại Việt nam và Lao 450 là giống ngô bao tử lai nhập nội của Lào) được bố trí theo khối ngẫu nhiên với 3 lần nhắc lại. Kết quả nghiên cứu chỉ ra rằng LAI, SPAD và khả năng tích luỹ chất khô tại các thời điểm 7-9 lá và trỗ cờ có mối tương quan thuận và chặt với năng suất bắp bao tử và năng suất bắp thương phẩm. Đây là những tính trạng quan trọng có thể sử dụng trong chọn tạo giống ngô bao tử lai. Tổ hợp lai D7xD10 được đánh giá là ưu tú có tổng năng suất tương đương và chất lượng cao hơn LVN23 đồng thời có ưu thế laidương cao về tính trạng năng suất bắp bao tử và năng suất chất xanh (sau thu bắp bao tử), đây là tổ hợp lai có triển vọng để phát triển ngoài sản xuất.
Effect of Organic Mulching on Yield and Quality of Mulberry Leaves UnderRain-Fed Condition

Nguyen Hong Hanh, Vu Van Tuan, Hoang Thi Lan

Date Received: 22-01-2015 / Date Accepted: 08-06-2015
The experiment was conducted in two seasons in 2014 to determine the effects of 4 organic mulching materials: rice straw, rice husk, sawdust, groundnut residue on leaf yield and leaf quality of mulberry (Morus alba L)under rain-fed condition. The field experiment with mulchingwas arranged in randomized complete block designwhileindoor feeding experiment of silkworm determine the quality of leaf mulberry was laid out using completely randomizeddesign with 3 replecations.The results showed thatorganic mulching materials increased growth of mulberry plant, yield and quality of mulberry leaves. Leaf yield inorganic mulching treatments was higher than control (no muching) from 31.5% to 51.8% in spring and from 8.3% to 54.2% in autumnand thecocoon yield increased from 9.2 - 15.2% and 5.1 - 16.8% in spring and autumn, respectively. Among organic materials, groundnut residue had the highest value in the total length of branch per plant, leaf thickness and leaf yield; silkworms were feed mulberry leavesfrom groudnut residue mulching treatment exhibited ncreased vitalityand brought about highercocoon weight in both seasons. The results also indicated that soil moisture content, soil organic matter content were improved by mulching with organic materials.
Effect of Shading and Mulching on Growth and Medicinal Material Yield of Polyscias fruticosa (L). Harms in Ha Noi

Ninh Thi Phip, Vu Thi Hoai, Nguyen Mai Thom, Nguyen Thi Thanh Hai, Nguyen Phuong Mai

Date Received: 21-08-2025 / Date Accepted: 02-12-2025 / Date Published: 23-01-2026
This study aimed to evaluate the effects of mulching methods (straw, plastic) and shading (25%, 50%) on the growth and yield of cultivar VT- ĐL2.1 of (Polyscias fruticosa (L.) Harms in Hanoi. The experiment was arranged in a randomized complete block design with three replications from 2020 to 2023. Observed parameters included plant height, number of branches, stem diameter, leaf number, SPAD index, dry matter accumulation, and medicinal material yield. The results showed that straw mulching significantly enhanced plant growth and root productivity. After three years, root yield reached 6.3 tons/ha, higher than by nilon mulching (5.2 tons/ha) and no mulching (5.7 tons/ha). Shading at 25% in the first year of planting was most suitable in terms of dry matter accumulation and 3 years after planting, the root dry weight and medicinal material yield obtained were 301.8 g/plant and 6.4 tons/ha, respectively.
DOI: https://doi.org/10.31817/tckhnnvn.2026.24.1.01
Effect of Water Stress on Growth and Yield of Mungbean under Nethouse Condition

Vu Ngoc Thang, Nguyen Thu Huyen, Nguyen Ngoc Quat

Date Received: 06-02-2012 / Date Accepted: 12-04-2012 / Date Published: 13-06-2025
This study was carried out to examine the effect of water stress on growth and yield of two mungbean cultivars DX22 and VN5 in the pot experiment under nethouse condition in comparison with full irrigation. For water stress treatments, irrigation was withheld at three developmental stages: beginning of flowering, full bloom and pod flling. Water stress was imposed until 70% of plants or 75% of leaves per plants withered and afterward the plants were rewatered for recovery, growth and yield assessment. Under water stress conditions, the rate of photosynthesis, rate of transpiration, pods per plant, and individual grain yields were all adversely affected. Grain yield reduction (weight of 100 seeds and seed yield) was greatest when water deficit occurred at the pod filling stage.
DOI: https://doi.org/10.31817/tckhnnvn.2012.10.2.
Effect of Slow-Released Nitrogenous Fertilizer with Polymer Coating on Growth and Yield of Maize in Spring Season in Gia Lam - Hanoi

Nguyen Van Phu, Nguyen The Hung, Nguyen Tat Canh, Dinh Thai Hoang

Date Received: 12-01-2012 / Date Accepted: 19-04-2012 / Date Published: 13-06-2025
This experiment was carried out in 2011 Spring season to evaluate the effect of polymer-coated, slow-released nitrogen fertilizer on growth and yield of maize grown on Red River alluvial soil at Gia Lam, Hanoi. Four doses of slow-released fertilizer, viz. 150 kg N/ha, 120 kg N/ha, 90 kg N/ha and 60 kg N/ha were used to compare with the conventional broacasting practice as control (150 kg N/ha). The results showed that doses of 90 – 150 kg N ha-1 of slow-released N fertilizer resulted in better growth and higher yield (yield increase by 4.8 – 10.8%). It was suggested that for maize cultivar LVN4 90 kg of slow-released N formulation be applied for in spring season for highest yield and economic efficiency.
DOI: https://doi.org/10.31817/tckhnnvn.2012.10.2.
Influence of Nitrogen Dose on Growth and Tuberous Root Yield of Mondo Grass on Feralit Soil at Hạ Hòa District, Phu Tho Province

Nguyen Dinh Vinh, Nguyen Thi Thanh Hai

Date Received: 03-10-2011 / Date Accepted: 08-01-2012 / Date Published: 13-06-2025
The application nitrogen fertilizer aim to define sensible nitrogen dose for tuberous root yield of mondo grass on Ferralic Acrisols at Phu Tho province. The application nitrogen dose change from 30 to 50 kgN/ha + 10 tons organic fertilizer + 30kg P2O5 + 30kgK2O/ha. Mondo grass was researched on growth of foliate, root and tuberous root yield. Results showed that: the dose of nitrogen fertilizer applying on 30kg N + 10 tons organic fertilizer + 30kg P2O5 + 30kgK2O/ha achieved the max tuberous root yield and economic effectivity. The tuberous root yield of mondo grass achieved 33,08 ton/ha. The income achieved 850,792 million VND/ha/3 years and investable effectivity of nitrogen fetilizer - 38,52 fold.
DOI: https://doi.org/10.31817/tckhnnvn.2012.10.1.
Effect of Water Deficit Level at Different Growth Stages on Photosynthesis, Yield and Water Use Efficiency of Sticky Maize (Zea mays L. sinensis Kulesh)

Chu Anh Tiep, Li Fu-sheng

Date Received: 01-11-2011 / Date Accepted: 07-02-2012 / Date Published: 13-06-2025
A pot experiment was carried out to study effect of four water deficit levels, viz. serious water deficit (SD, 35% ~ 45% θf, θf field water capacity), medium water deficit (MD, 45% ~ 55% θf), mild water deficit (LD, 55% ~ 65% θf) and normal irrigation (CK, 65% ~ 80% θf) at the seedling – early joining stage, later joining – booting stage and booting – flowering stage of maize crop, on the photosynthetic rate, yield and water use efficiency of sticky maize. The results showed that water deficit decreased photosynthetic rate, transpiration rate, dry matter accumulation and grain yield at all growth stages of corn plant. In comparison with the well-watered control, SD significantly decreased both dry matter accumulation and yield. However, LD and LD did not significantly decrease yield but reduced total water consumptions by 10.75~19.85%.
DOI: https://doi.org/10.31817/tckhnnvn.2012.10.1.
Effect of Eggshell Powder Application and Mulching on Growth and Yield of Spring-Grown Groundnut cv. MD7 in Phu Xuyen - Ha Noi

Tong Van Giang, Tran Thi Huong, Vu Ngoc Lan, Vu Ngoc Thang

Date Received: 15-01-2025 / Date Accepted: 18-04-2025 / Date Published: 30-04-2025
The experiment was conducted to evaluate the effect of eggshell powder application rates and transparent plastic mulchingon growth and yield of MD7 groundnut variety in spring season in Phu Xuyen, Hanoi. A two factor experiment was laid out in a split-plot design with three replications. The main factor consisted of three rates of eggshell powder application (200, 300, and 400 kg/ha) and the sub-factor included plastic mulching and non-mulching. The results showed that higher values of growth and yield parameters of MD7 groundnut variety were observed under plastic mulching. Comparing among the rates of eggshell powder indicated that the highest values of growth and yield parameters of MD7 groundnut variety were observed at the rate of 300 kg eggshell powder/ha, except for plant height. Briefly, the results indicated that the rate of 300kg eggshell powder/ha under plastic mulching was suitable for MD7 groundnut variety interms of growth and yield in the spring season in Phu Xuyen, Hanoi.
DOI: https://doi.org/10.31817/tckhnnvn.2025.23.4.01
Effect of Seeds on Different Umbel Positions to Growth, Development and Yield of Angelica dahuricaBenth. Et Hook. F. at Gia Lam Ha Noi

Ninh Thi Phip, Nguyen Huu That

Date Received: 06-08-2012 / Date Accepted: 15-09-2012 / Date Published: 13-06-2025
“Bach Chi” is a medicinal plant and an essential constituent in traditional medicine. The plant has abundant flowers and fruits distributed on the different umbels. Time of flowering, number of umbels, umbel size, seed size and seed yields are different on each umbel position. Seed yield is highest on the secondary umbels (149.5 gr), but lowest on the central umbels. The aims of this paper are to determine whether the seed quality varies with umbel position and any effect of umbel position on growth, development and yield of Angelica dahurica Benth. Et Hook. F (Apiaceae) exists. Seeds were collected at five umbel types (center, primary, secondary, teriary and posterior umbels uppermost). Characteristics of individual umbels (duration of flowering, size) and plants (reproductivity, age, height, basal diameter) were recorded. The results showed that plants obtained from fruits on primary and secondary umbels grew much better (i.e. plant height, root diameter and yield) than those in collected from other umbels. The highest of root yield (3.16 ton/ha) and grade I percentage of roots (94.32%) were obtained from plants derived from seeds harvested on secondary umbels. The fruits on the primary, secondary and tertiary umbels are recommended for high quality of seeds to produce high quality of Bach Chi roots.
DOI: https://doi.org/10.31817/tckhnnvn.2012.10.6.

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