| The research results of major strip farmland systems in the Xingdian irrigation zone displayed that in various farming modes, the accumulative amounts of dry matter, the equivalent yields, and the yield of crude protein generally high, ranging between 1213.7 kg/hm2 and 2840.89 kg/hm2, 15734.7 kg/hm2 and 33198.2 kg/hm2, 1794.3 kg/hm2 and 2283.2 kg/hm2, respectively; the inputs and output of energy ranged between 1.6359×1011 J/ hm2 and 2.3942×1011 J/ hm2, respectively, which were higher than the national averages in the mid-yield region with the same type of strip farmland, but the output-input ratios of energy were not high, only ranging between 1.27 and 1.28, and the reason for this was high input of electricity power among the inputs of inorganic energy; the temporal efficiencies of the utilizations of ≥0 ℃ accumulative temperature, rainfall and solar radiation ranged between 90.0% and 93.1%, 90.7 and 94.0%, and 83.8% and 87.5%, respectively; The use efficiencies of solar energy in biomass and kernels ranged between 0.53% and 1.05% and 0.24% and 0.45%, respectively; the production values and net incomes of the six systems varied between 10314.75 yuan/hm2 and 12682.34 yuan/ hm2, and 5497.50 yuan / hm2and 8061.75 yuan/ hm2, respectively; the high-profit farming modes for stripe farmland were benne/soybean, corn/pea and corn/horsebean ones; wheat/soybean, corn/pea, corn / horsebean had relatively high productive superiorities but poor stability and thus the realizations of their yield-increasing potentials needed the concerted combination of other farming practices. |