Effects Of Application Of Biochar-Based Fertilizer On Rice Yield And Quality Under Applying Chinese Milk Vetch

In order to study the effect of nitrogen reduction and bio-char fertilizer on rice yield and quality under applying Milk vetch.In this study,the red soil of paddy field was taken as the research object from 2018 to 2019,field experiment and pot experiment were carried out.The experiment set Milk vetch 1500kg/mu to return to the field,and 50% chemical fertilizer was applied with different amounts of carbon-based fertilizer(10,20,30 kg/Mu),which were expressed as(BF-10,BF-20,BF-30).Through the determination of rice biomass,N,P,K Nutrient Index and rice quality index,the main results are as follows:1.The effect of different bio-char fertilizer on rice yield(1)with the increase of bio-char fertilizer,rice grain yield and yield of rice straw increased first and then decreased,and the best performance was when BF-20 was treated.2.Effects of different bio-char fertilizer rates on nitrogen and phosphorus uptake by Rice(1)the accumulation of nitrogen and phosphorus nutrients in rice stems and leaves increased firstly and then decreased with the advance of growth period,and reached the maximum value at full heading stage.(2)with the increase of bio-char fertilizer application,the accumulation of N and P in rice leaves increased first and then decreased,and all showed the best performance when BF-20 was treated.3.The effects of different bio-char fertilizers on the appearance and quality of Rice(1)the appearance quality roughness,milled rice rate and head rice rate increased first and then decreased with the increase of bio-char fertilizers;All treatments reached the maximum value when dealing with BF-20.(2)with the increase of bio-char fertilizer,the chalkiness rate of grain quality increased,and it was the best when treated with BF-10,and the amylose content decreased first and then increased,and it was the best when treated with BF-20.To sum up,under applying Milk vetch to the field,bio-char fertilizer can replace some fertilizers to stabilize rice yield,promote the accumulation of nitrogen and phosphorus nutrients in rice leaves,and improve rice quality.In addition,the model of replacing 50% fertilizer with 20kg/mu bio-char fertilizer has the best comprehensive performance,and this model of fertilization has a wide range of promotion value.