论文部分内容阅读
本试验探讨了 666.7m2 产皮棉 1 50 kg水平下氮磷钾三要素的配比效果及其优化施用技术。建立了 y=1 52 .8+7.9778x1+3.62 2 3x2 +4.62 97x3+0 .41 2 5x1x2 +0 .862 5x1x3- 0 .4375x2 x3- 3.5963x12- 5.6643x2 2 - 5.6996x32 的回归方程。经对回归系数分析 ,b0 、b1达极显著 ,b3、b2 .2 、b3.3达显著 ,其他均不显著。进行模拟选优 ,求得 666.7m2 追肥量为7.78kg纯氮、 1 .94kg五氧化二磷和 3.2 2 kg氧化钾时可获得最高皮棉产量 1 61 .3kg。再对模型分析 ,在追肥量为 7.57kg纯氮、 1 .92 kg五氧化二磷和3.1 0 kg氧化钾时 ,边际产量为 1 59.2 kg。进一步将皮棉单价与化肥成本代入后进行最佳经济效益分析 ,在每 666.7m2追施 7.1 8kg纯氮、 1 .88kg五化二磷、 3.0 6kg氧化钾时 ,每 666.7m2 最佳经济产量为 1 59kg,产值 1 71 7.2元 ,最佳经济效益 1 61 4.0 4元。这时的全程化肥施用量即为尿素 40 .75kg、过磷酸钙 76.74kg和硫酸钾 2 3.1 1 kg。
The experiment discussed the effect of the three factors of NPK and N, P and K under the level of 666.7m2 lint cotton and optimized application technology. The regression equation for y = 1 52 .8 + 7.9778x1 + 3.62 2 3x2 +4.62 97x3 +0 .41 2 5x1x2 +0 .862 5x1x3-0.4375x2 x3- 3.5963x12- 5.6643x2 2 -5.6996x32 was established. After the regression coefficient analysis, b0, b1 reached a very significant, b3, b2. 2, b3.3 significant, the other were not significant. The optimum yield of 666.7m2 top dressing was 7.78kg of pure nitrogen, 1.94kg of phosphorus pentoxide and 3.2.2kg of potassium oxide, and the highest lint yield was 161.13kg. Then the model analysis showed that the marginal product was 159.2 kg when the dressing amount was 7.57 kg of pure nitrogen, 1.92 kg of phosphorus pentoxide and 3.1 kg of potassium oxide. Further analysis of the best economic benefit after replacing the unit price of lint with the cost of fertilizers showed that the optimum economic yield per 666.7 m2 was 1 per 666.7 m2 when topdressing 7.18 kg of pure nitrogen, 1.88 kg of pentasulfide and 3.06 kg of potassium oxide 59kg, the output value of 1 71 7.2 yuan, the best economic benefit of 1 61 4.04 yuan. At this time the full amount of chemical fertilizer is urea 40 .75kg, 76.74kg of superphosphate and potassium 2 3.1 1kg.