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• Research on Using Endophytic Bacteria Isolated from Different Ecosystems

  Nguyen Hai Van, Nguyen Thi Minh

  Date Received: 03-05-2017 / Date Accepted: 14-06-2017

   Abstract PDF (VIETNAMESE)

  The aim of this study was to select and use the endophytic microorganism strains from different ecosystems for the production of multifunctional biofertilizer formulation for crop plants. The endophytic microorganisms were selected for their IAA and hydrolytic enzyme production, phosphorus solubilization, and antagonism to pathogenic microorganims. Six endophytic bacterial strains, 3TDG1, 3TDG4, 3TDG5, 3LC2, 3LDQ2 and 3CL2, with high bioactivity were selected from 32 endophytic bacteria strains. These strains were used for adding into the nutrient liquid obtained from treatment of livestock waste for the production of multifunctional biofertilizer formulation. These strains were 99% homologous with Klebsiella pneumoniae strain PSB1, Klebsiella oxytoca strain ALK033, Aeromonas caviae strain J5; Pseudomonas putida strain E1-4, Pantoea rodasii strain Y36 and Bacillus subtilis strain QB5413, respectively. The yield of Basella alba L. in tetsting experiment fertilized with multifunctional formulation increased by 89.51% as compared with the use of NPK fertilizer.

• Efficacy of Biofertilizers Containing Phosphorus Solubilizing Bacteria on Growth And Yield of Maize Cultivated on Alluvial Soil in Dyke Collecting from Chau Phu District, An Giang Province in Greenhouse

  Tran Ngoc Huu, Le Thi My Thu, Nguyen Hong Hue, Le Vinh Thuc, Tran Chi Nhan, Nguyen Minh Chau, Nguyen Quoc Khuong

  Date Received: 16-04-2021 / Date Accepted: 09-07-2021

   Abstract PDF (VIETNAMESE)

  Objective of this study was to determine the effects of three biofertilizers containing P-solubilizing bacterial strainson growth and yield of maize cultivated on alluvial soil in dyke collecting from Chau Phu district, An Giang province. The pot experiment was arranged in a completely randomized design, with 13 treatments, 4 replications. Treatments included (i) 100% P, (ii) 75% P, (iii) 50% P, (iv) 25% P, (v) 75% P + Biofertilizer-1, (vi) 50% P + Biofertilizer-1, (vii) 25% P + Biofertilizer-1, (viii) 75% P + Biofertilizer-2, (ix) 50% P + Biofertilizer-2, (x) 25% P + Biofertilizer-2, (xi) 75% P + Biofertilizer-3, (xii) 50% P + Biofertilizer-3 and (xiii) 25% P + Biofertilizer-3. The results showed that application of 25-75% P combined with biofertilizer-1 containing mixture of Enterobacter cloacaeAG-VR-B-15, AG-VR-B-56 and AG-VR-B-43 or biofertilizer-2 containing mixture of Burkholderia vietnamiensisAG-VR-B-21, AG-VR-B-08 and AG-VR-B-10 and biofertilizer-3 containingmixture of E. cloacae AG-VR-B-15, AG-VR-B-56 and AG-VR-B-43, B. vietnamiensis AG-VR-B-21, AG-VR-B-08and AG-VR-B-10contributed to maintain plant growth as plant height, number of leaves and plant diameter as compared to 100% P. Application of biofertilizers CPVS-BL-1, or CPVS-BL-3 with 25-75% P reduction also resulted in higher yield in comparison with 100% P application without biofertilizer.