Effects of long-term application of straw biochar on soil nutrient and crop growth
Long-term field experiments were carried out from 2011 to 2020 with four treatments of without fer-tilizer(CK),without fertilizer plus biochar only(CK+B),nitrogen,phosphorus,and potassium fertilizer(NPK),and NPK fertilizer plus biochar(NPK+B).Maize and sorghum were rotated.This experiment was con-ducted to study the influences of organic carbon continuous application with 5 years and 10 years on soil organic matter,total N,available P and available K contant,as well as soil sucrase,urease,alkaline phosphatase,and catalase enzyme activities in 0～20 cm soil layer,along with changes in biomass,nutrient accumulation and yield.The result showed that:(1)Compared with CK,CK+B enhanced soil organic matter by 46.3％and 61.2％after biochar applying 5 and 10 years,respectively;meanwhile they were increased by 67.8％and 77.7％induced by NPK+B relative to NPK,respectively.10-year biochar application resulted in a higher soil total N content when fertilizer was withdrawn,whereas no difference was noticed under conditions of fertilization.Soil available K con-tents were enhanced significantly by 86.4％and 46.6％for CK+B and NPK+B,compared with CK and NPK,re-spectively.(2)Biochar applying continuous for 10 years significantly increased the activities of sucrase by 11.4％～11.9％and alkaline phosphatase by 7.9％～16.2％,but had no effect on soil urease,catalase,and available P.(3)The positive effect of biochar on accumulative P and K uptake both at heading and maturity was observed,but there was no effect on N accumulative uptake at the maturity after 10-year's application.Biochar did not enhance grain yield irrespective fertilization treatment.Obviously,long-term application of straw biochar promoted soil organ-ic matter and soil available K significantly whereas there were relative low influences on soil total N and available P.Biochar application improved the uptake both P and K.Therefore,when biochar was applied,N should be supplied to maintain crop growth,and decrease K dose.
straw biocharlong term applicationsoil nutrient contentcrop nutrient absorptioncrop yield
万方数据
维普
