Reducing nitrogen fertilizer combined with biochar amendment improves soil quality and increases grain yield in the intensive rice cultivation system

Vu Van LONG; Tran Van DUNG

doi:10.18393/ejss.1260911

Reducing nitrogen fertilizer combined with biochar amendment improves soil quality and increases grain yield in the intensive rice cultivation system

Authors : Vu Van LONG, Tran Van DUNG

Pages : 222-228

Doi:10.18393/ejss.1260911

View : 64 | Download : 27

Publication Date : 2023-07-02

Article Type : Research Paper

Abstract :Intensive rice cultivation for a long time resulted in increasing soil degradation and less yield. This study aimed to evaluate effects of the combining reducing nitrogen fertilizer insert ignore into journalissuearticles values(N); with biochar amendment on soil chemical properties, rice growth parameters, and grain yield in the rice cultivation system in the Mekong Delta region, Vietnam insert ignore into journalissuearticles values(VMD);. Field experiment was designed in the split-plot design with two factors, including N fertilizer insert ignore into journalissuearticles values(main plot); and biochar insert ignore into journalissuearticles values(sub-plot);. Two N fertilizer rates were: insert ignore into journalissuearticles values(N50);—50 kg N ha–1 and insert ignore into journalissuearticles values(N100);—100 kg N ha–1, which is the farmer\`s practice. Biochar was amended with three rates: no applied biochar insert ignore into journalissuearticles values(B0);, 5 t ha–1 insert ignore into journalissuearticles values(B5);, and 10 t ha–1 insert ignore into journalissuearticles values(B10);. The results indicated that reducing N fertilizer by 50% combined 5–10 t biochar ha–1 resulted in maintaining soil pH, soil electrical conductivity, soil organic carbon, cation exchange capacity, and rice biomass. Applying biochar at a rate of 5–10 t ha–1 significantly increased the available N, available P, and rice height compared to the treatment with no applied biochar insert ignore into journalissuearticles values(B0);. Rice yield in the treatments applied with 5–10 t ha–1 was significantly higher than the treatment without the use of biochar by 11.6–14.7%. The findings of this study confirmed that reducing 50% N fertilizer combined with 5 t ha–1 or 10 t ha–1 of biochar could improve soil available N, available P, rice growth, and grain yield in intensive rice cultivation systems in the VMD region.
Keywords : Biochar, nitrogen, Oryza sativa L, paddy soil, phosphorus, soil fertility

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