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• Effect of Fertilizer Doses on Winter-grown Soybean on Alluvial Soils in Trieu Son District, in Thanh Hoa Province

  Doan Van Luu, Vu Dinh Chinh, Vu Quang Sang

  Date Received: 30-10-2017 / Date Accepted: 09-01-2018

   Abstract PDF (VIETNAMESE)

  The effect of fertilizer doses on soybean was evaluated todetermine optimal fertilizer levelfor growth and yield of soybean grown in winter cropping season in Thanh Hoa province. Theexperiments were performed on two soybean varieties D140 and ĐVN5using two factor split - plotdesignwith 3 replications Research results of experiments showed thatfertilizer levelsaffectedthe leaf area, mass and number of nodules, dry matter accumulation, total podson plants and grain yield of winter grown soybean. Optimal dose of fertilizer to achieve high yieldandnet income for both soybean varieties D140 and ĐVN5 in Thanh Hoa provincewass 30 kg N + 90 kg P2O5+ 60 kg K2O/ha.

• Effect of Microbial-Organic Fertilizer and Plant Density on Growth, Development and Yield of Black Sticky Rice Variety ĐH6

  Nguyen Thi Hao, Dam Van Hung, Nguyen Giao Ho, Vu Van Liet

  Date Received: 22-09-2014 / Date Accepted: 15-09-2015 / Date Published: 13-06-2025

   Abstract PDF (VIETNAMESE)

  A study was conducted to assess the effect of organic fertilizerand plantingdensity and their interaction on physiological characteristics and yield of black sticky rice variety DH6. It was found that different levels of organic fertilizerdid not affect plant heightand growth duration. The fertilizerlevel-planting density interaction clearlyinfluenceleaf area index (LAI) and dry matteraccumulationat allgrowth stages. At eachorganic fertilizerlevel and plant density, there was no correlation between productivity and LAI at the maximum tillering stage, but closecorrelation between productivity and LAI at anthesis and ripening stages. At dough grainstage, planting density of 40 seedlings/m2yieldedhighest dry matter accumulation in all organic fertilizer compost levels. Application of of 700 - 900 kg and 900kgorganic fertilizer per spring and autumn crop, respectively, gave highest grain yields.

  DOI: https://doi.org/10.31817/tckhnnvn.2015.13.6.