Preliminary research on fertilizer effects in high fertile cotton field

Result of this study indicated that potassium fertilization has no effect on increasing yields in (380 mg·kg~(-1)) available potassium soil. Available nitrogen 126 mg·kg~(-1) and available phosphorus, effective equation between the cotton yields and N,P fertilization quantities are as follows:Y=1195.6+1.11N+1.96P-0.001534N~2-0.007359P~2+0.003396NP,then the best economical fertilization quantities could be made:urea was 560.3 kg·hm~(-2),tri-phosphate was 178.8 kg·hm~(-2),the best economical yield of cotton was( 1 792.1 kg·hm~(-2)。)