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玉米高产田(亩产700～770公斤)与一般生产田(亩产500～530公斤)相比较。经济效益:亩化肥投入费用由58.53元增加到87.08元时,亩纯收益下降;选用高产品种,能明显增加纯收益;改进耕种、施肥技术,也能增加纯收益;适量的化肥投入与品种、耕种、施肥技术相结合,亩纯收益可大幅度增加。高产田光能利用率明显地高于一般生产田。能量效益:高产田的能量产、投比,以及亩绝对能量产出均都明显地高于一般生产田,增加无机能(化肥)投入、改进栽培技术,特别是选用高产品种,都能增加亩绝对能量产出。养分效益:N素,亩施22.5公斤,亩产765～770公斤时,产出<投入;亩施17.5公斤,产量为710～736公斤时,产出>投入,产量为523公斤时,产出<投入。P_2O_5,亩施7.0～7.5公斤,高产田和一般田均都是产出<投入。K_2O,高产田和低产田都是产出>投入。
High yield fields of maize (700-770 kg per mu) are compared with those of general production (500-530 kg per mu). Economic Benefit: When the input cost per mu of chemical fertilizer increased from 58.53 yuan to 87.08 yuan, the net income of the mu decreased; the high-yielding varieties could obviously increase the net income; the improvement of cultivation and fertilization technology could also increase the net income; the proper amount of fertilizer input and variety, Cultivation, fertilization technology combined, net income per acre can be substantially increased. The utilization of light energy in high-yield fields is obviously higher than that in general production fields. Energy efficiency: The energy yield, the input ratio and the absolute energy output per mu in the high-yielding fields are obviously higher than those in the general producing fields. Increasing the input of inorganic fertilizers and improving cultivation techniques, especially the selection of high-yielding varieties, can increase Mu absolute energy output. Nutrient Benefit: N Vegetarian, 22.5 kg per acre, 765-770 kg per acre, output 710-736 kg, output> input, output of 523 kg input.