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五项农艺措施采用五元二次正交旋转回归设计组合试验,建立产量、投资效益和亩纯利的数学模型并电脑模拟预测表明:在保证土壤磷钾不缺情况下,油菜要亩产250公斤以上,需在10月1日前播种,亩施纯氮18公斤,施硼砂0.6公斤,每亩密度9千至1万株,初花至盛花期防病1～2次,亩产200～250公斤,需在10月6日左右播种,亩施纯N15公斤以上,施硼砂0.4公斤,每亩密度1.2万株左右,初花至盛花期防病1～2次。主因素效应以施N量,播期对产量、投资效益和亩纯利的影响最为显著,交互效应则以密度和施氮量的交互影响较大。适时早播以及合理增加密度,配合适当,降低氮肥用量能在不增加或减少投资的情况下,提高产量增加经济效益。增加氮肥的投资,所获纯利仍显著。
The five agronomic practices using five yuan quadratic orthogonal rotation regression design combination test to establish the mathematical model of yield, investment returns and net profit and computer simulation showed that: to ensure that the soil phosphorus and potassium are not missing, the rape should produce 250 kg per mu Above, need to sow before October 1, Mushi Shi 18 kilograms of pure nitrogen, borax 0.6 kg, density of 9 thousand to 10,000 per acre, early flowering bloom disease prevention 1 or 2 times, 200 to 250 kg per mu , Need to sow about October 6, Mushu pure N15 kg, borax 0.4 kg, density of about 12,000 acres per acre, early flowering bloom disease prevention 1 or 2 times. The effects of main factors on the yields, investment benefits and net profit were the most notable in terms of N rate and sowing date, while the interactive effects had a greater impact on the interaction of density and N rate. Timely early sowing and reasonable increase in density, with appropriate, reduce the amount of nitrogen fertilizer without increasing or decreasing investment, increase production and increase economic efficiency. Increasing the investment of nitrogen fertilizer, the net profit is still significant.