Study on Activating Effect of Soil Available P and K through Application of Cotton Stalk Biochar

【Objective】 The study focuses on the effect of cotton stem biochar(BC) applied on changing available P and K in grey desert soil and sand irrigated soil.【Method】Two types of soil were taken as trial materials,and four treatments were set,which were 0%biochar(CK),and 0.5%biochar,1.0%biochar and 2.0%biochar,respectively.Indoor incubation experiment was conducted to investigate pH value,and available P,and K,and cation exchange capacity(CEC).【Result】PH value,CEC,available P and K was increased by dosage of BC applied in soil;High dosage of BC(2%) applied would lead to soil available P,and K improvement in short term(P 0.05).The increasing rates were 25.21%- 45.79%.10.24- 28.05%.23.34%-101.17%and 38.95%-62.36%,respectively.【 Conclusion】It was inferred that soil available P and K could be activated through application of cotton stalk biochar,and the applied biochar could improve soil fertility to a certain extent.