论文部分内容阅读
近年来,我们对上海郊区早稻产量和氮肥使用量之间的关系进行了研究。结果表明,在上海郊区早稻施肥有一个极值,若再增大施肥量,产量反而下降,不会继续上升。因此,早稻施肥生产函数的基本模型选二次回归方程或平方根回归方程比较合理,能同时反映出施肥过量时的产量减少情况。 (一)方程对肥量与产量关系的运用性几年来,我们做了不同氮肥量与产量间关系的田间试验,通过采用不同次方的回归方程,拟合成一元二次回归方程,预测产量和了解早稻不同施肥量的产量变化过程,效果较好。但试验的施肥水平变化范围要大,模拟整个肥料与产量的关系才比较正确。
In recent years, we have studied the relationship between the output of early rice and the amount of nitrogen fertilizer in the suburbs of Shanghai. The results showed that in the suburbs of Shanghai, there was an extreme value of fertilization in early rice. If we further increase the amount of fertilization, the output will drop but will not continue to rise. Therefore, the basic model of the fertilization production function of early rice selection quadratic regression equation or square root regression equation is more reasonable, can also reflect the decline in yield when fertilization excess. (A) the use of equations on the relationship between fertilizer and yield In recent years, we have done a field experiment of the relationship between different nitrogen and yield, through the use of regression equations of different power, fitting into a quadratic regression equation to predict the yield And to understand the different fertilization amount of early rice yield change process, the effect is better. However, the range of fertilization applied to the experiment should be large. It is only right to simulate the relationship between the whole fertilizer and the yield.