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按照Meta分析原理,汇集近年来的玉米田间试验数据共722组,进行稳健统计、梯度和等值线分析。氮、磷、钾、水和二氧化碳共5个数据集的玉米产量中位数变化在7.91~10.61 t/hm2之间,生产百公斤玉米子粒N、P2O5、K2O、CO2、H2O的资源需求量分别为1.98、0.85、2.12、298.8 kg和44.2 m3。产量偏导数比值(资源利用效率的偏导数/积累量的偏导数)有3种表现,水与氮归为一类,产量偏导数比值大多数都在1/2以下,少数值为1,说明在大多数情况下,积累量的增产作用是资源利用效率的2倍以上,少数情况下二者作用相当;钾与磷为一类,产量偏导数比值以1最多,1/2和2次之,说明以资源利用效率和积累量的作用相当为主,但是,也有不少利用效率的作用是积累量的2倍以上,或者相反;二氧化碳绝大多数产量偏导数比值在2以上,较少部分的值为1,说明在绝大多数情况下资源利用效率的增产作用是积累量的2倍以上,少数情况下二者作用相当。当代玉米百公斤子粒的资源需求量明显下降,资源积累(消耗)量和利用效率对产量的相对重要性因二者组合所处的区域而异,不同资源因子对产量的作用格局不同。
According to the principle of Meta analysis, a total of 722 groups of corn field trials in recent years were collected, and robust statistics, gradient and contour analysis were performed. The median yield of maize in 5 datasets of nitrogen, phosphorus, potassium, water and carbon dioxide varied from 7.91 to 10.61 t / hm2. The resource requirements for producing 100 kg of maize N, P2O5, K2O, CO2 and H2O 1.98, 0.85, 2.12, 298.8 kg and 44.2 m3. Yield partial derivative ratio (partial derivative of resource use efficiency / partial derivative of accumulated efficiency) has three kinds of performance, water and nitrogen are classified into one category, most of the partial derivative yield ratio is below 1/2, a small value of 1, indicating In most cases, the cumulative production increase effect is more than 2 times of resource utilization efficiency, in a few cases, the two are equivalent; K and P are a class, and the partial derivative yield ratio is 1, 1/2 and 2 times , Indicating that the role of resource utilization efficiency and accumulation of considerable considerable, but there are a number of the role of efficiency is the accumulation of more than 2 times, or vice versa; most of the output of carbon dioxide partial derivative ratio above 2, a smaller part A value of 1, indicating that in most cases the efficiency of resource use is more than double the cumulative amount of accumulation, in a few cases the role of the equivalent. The demand for resources of contemporary 100 kilograms of corn decreased significantly. The relative importance of resource consumption and consumption efficiency to production was different due to the combination of the two areas. The effect of different resource factors on the yield was different.