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肥料推荐通常是以获得单位面积最大效益的最高经济施肥量为基础。在投资有限时,其肥料用量显然不可能满足所有作物。在这种情况下,需有一种计算每种作物最大效益肥料用量的方法。本研究的目的就是为了发展这种方法,以计算在同一年间种植两种不同作物或同一种作物种植在不同季节而它们的需肥量不同时的氮肥施用数量。作物1(S_1)和作物2(S_2)氮肥的分配经济用量(SR)可用下列公式计算:S_1=(P_2A_2b_2-P_1A_2b_1+2P_2c_2k)/2(P_1A_1c_1+P_2A_1c_2)和S_2=(k-A_1S_1)/A_2式中 S_1和 S_2是作物1和作物2的氮素分配量(公斤/公顷);P_1和 P_2是作物1和作物2的产品价格(美元/公斤):A_1和 A_2是作物1和作物2的种植面积(公顷),k 是对 A_1和 A_2总的有效氮量(公斤);b_1,b_2,c_1和 c_2是作物1和作物2二次产量函数的回归系数(Y=a+bN+cN~2,式中 Y 是预计产量,N 是施入 N公斤/公顷)。
Fertilizer recommendations are usually based on the highest economic fertilizer that maximizes the benefit per unit area. With limited investment, it is clearly not possible to meet all of the crop’s fertilizer use. In this case, there is a need for a method of calculating the maximum benefit of fertilizer for each crop. The purpose of this study was to develop this method to calculate the amount of nitrogen fertilizer applied when two different crops were planted or the same crop was planted in different seasons in the same year with different amounts of fertilizer needed. The economic distribution (SR) of nitrogen fertilizer allocation for crop 1 (S_1) and crop 2 (S_2) can be calculated using the following formula: S_1 = (P_2A_2b_2-P_1A_2b_1 + 2P_2c_2k) / 2 (P_1A_1c_1 + P_2A_1c_2) and S_2 = (k-A_1S_1) / A_2 Where S_1 and S_2 are the N allocations (kg / ha) for Crops 1 and 2; P_1 and P_2 are the product prices for crop 1 and crop 2 (US $ / kg): A_1 and A_2 are crop 1 and 2 Planting area (hectare), k is the total available nitrogen (kg) for A_1 and A_2; b_1, b_2, c_1 and c_2 are the regression coefficients of the secondary yield functions for crops 1 and 2 (Y = a + bN + cN ~ 2, where Y is the projected production and N is the application of N kg / ha).