关中灌区棉花高产高效规范化栽培技术研究

Study on Standard Cultural Technique for High Yield and High Profit of Cotton in Guanzhong Irrigated Area

本试验采用五元二次正交旋转回归设计方法 ,对影响棉花产量、品质及效益的密度、播期、底施二铵、追施尿素和化控等主要农艺措施进行了综合研究 ,并建立了相应的数学模型。通过模拟 ,筛选出霜前皮棉 >1 5 0 0 kg/hm2 、产投比 >8的最佳农艺措施组合方案为 :密度 765 3 0～ 781 5 0株 /hm2 ,播期 4月 8～ 1 0日 ,底施二铵 82 .5～ 99.0 kg/hm2 ,追施尿素 73 .5～ 94.5 kg/hm2 ,喷 DPC 5 0～ 69g/hm2 。反馈试验表明 ,优化组合方案平均增产 1 2 .1 % ,效益显著。

Regression method of orthogonal conic substitution with 5 factors was employed in this paper to study comprehensive effects of density,sowing time,Base P fertilizer, topdressing N fertilizer and spraying DPC on the yield,quality, benefit of cotton.According to the result of experiment,the mathematical model for yield and benefit was set up.Through the model based on simulation and sieved by computer,the optimum compehensive agronomic measures were selected for pre front lint yield over 1 500 kg/hm 2 and yield/invest over 8.The result of the measures was density 76 530～78 150 plant/hm 2 ,sowing time 4/8～4/10,base P fertilizer 82.5～99.0 kg/hm 2 ,topdressing N fertilizer 73.5～94.5 kg/hm 2 ,spraying DPC 50～ 69 g/hm 2 . Using the optimum plan,the multiple plot experiments showed that the cotton lint yield increased 12.1%,the econmic benefit was notable.