农田合理投能区域与最优投能配比的研究

研究表明，农田代辅助能投入有一个合理的投区域，在该区域内增加水肥投能可增加产出能和产投比，总产出能的合理投能区域大于产投比的合理投能区域；低产农田的合理投区域大小高产农田，通过人工辅助能的增加，可能低产农田与高产农田一样达到作物的最高产量水。在合理投能区域内存在水分投 效线和肥料投入高效线，在两条线上相应的水分和肥料投入效益最高；也存在最优投能配比线和最优经济投入配比线，在两条线上的水肥投入，其能

Rational range and optimum proportion of energy input in farmland

There exists a rational range of artificial supplemental energy inputs in fields.In the range,the inputs can improve the yield and the output/input ratio.The rational range of energy input in total energy output is bigger than that in the output/input ratio.It is bigger in low yield fields than high yield fields,which suggests that increasing artificial supplemental energy input can increase the production of low yield fields as same as high yield fields.In the rational range of energy input,there exist high efficient lines in water and fertilizer inputs.The highest efficiency occurs when the rational inputs of water and fertilizer occur in these two lines.There also exist optimum lines of energy and economy input proportions.In the two lines,the proportions of energy and economy output/input of water and fertilizer inputs are the highest,which are the optimum of water and fertilizer inputs.Water and fertilizer may replace each other for equal yields,but would result in a decrease in the output/input ratio.