论文部分内容阅读
为了分析低产原因,我们抽调了资料比较完整的122块条田,累计面积为20746亩(占总面积的41. 4%),进行单因子的二次回归分析和多因子的逐步回归分析.分析的因子有:1、亩施标准氮肥量(kg),2、亩施标准磷肥量(kg),3、中耕次数,4、化调次数,5、叶面喷肥次数,6、浇水次数;7、植株高度(cm),8、收获密度(株/亩),9、单株平均成铃数,10、籽棉铃重(g).这10个因子分别以X_1—X_(10)代表之.籽棉产量(kg/亩)以Y来代表.经过一元二次回归分析,95年一三三团棉花生产中,实际实施的水平与应该达到的最佳值(极值点)的差距是比较大的.如标氮每亩少施27.2kg,标磷每亩少施12.8kg,中耕少0.3次,化调少0.9次,叶面喷肥少1.1次,浇水少0.8次,株高差9.3cm,密度缺2350株/亩,单株成铃少1.7个,铃重轻0.8g,亩产籽棉223.4kg,减产216.1kg/亩.从理论上讲减产将近一半.
In order to analyze the causes of low yield, we have drawn 122 pieces of field with relatively complete data, with a total area of 20746 mu (41.4% of the total area), carrying out the quadratic regression analysis of single factor and the stepwise regression analysis of multiple factors. The factors are as follows: 1, standard fertilizer amount of nitrogen per mu (kg), 2, standard fertilizer amount of fertilizer per mu (kg), 3, cultivating times, 4, the number of tune, 5, foliar fertilizer times, 6, ; 7. Plant height (cm); 8. Harvest density (strain / acre); 9. Average number of bolls per plant; 10, Seed boll weight (g) .These 10 factors are represented by X_1-X_ The seed cotton yield (kg / acre) is represented by Y. After a one-time second-order regression analysis, the difference between the actual implementation level and the optimal value (extreme point) If the standard nitrogen per acre less 27.2kg, standard phosphorus per mu less Shi 12.8kg, cultivating less 0.3 times, the transfer less 0.9 times, 1.1 times less foliar spray, watering less 0.8 times, plant height Poor 9.3cm, lack of density 2350 plants / mu, plant boll less 1.7, boll weight 0.8g, seed cotton 223.4kg, cut 216.1kg / mu. Theoretically speaking, about half the yield reduction.