农田能量投入产出规律的研究

A study on farming energy inputs and outputs

农田人工辅助能投入与能量产出或能量产投比之间都遵循一元二次回归模型，随着辅助能投入增加，产投比和总产出都会出现一个最大值，两个最大值对应的投能水平之间为合理投能区间。半干旱生态条件下，水的增产作用相对大于肥的增产作用，水分条件对投肥水平有重要制约作用，直接影响投肥效果。自然辅助能与人工辅助能在作用上有互补性。

The relationship between the farm artificial supplemental energy inputs and the energy outputs or the ratio of energy outputs to input accords with the monquadratic regression model. With the increasing of supplemental energy inputs, the ratio of energy outputs to inputs and the total outputs will appear a peak respectively, The region between the energy input levels corresponding the two peaks is the reasonable region for energy inputs. under semiarid condition ,water is more effective to increase the production than fertilizer. The effect of fertilizer on the yield become conditioned by water and the natural and the artificial supplemental energy compensate each other in function.