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本研究对两种耕作方式下不同氮肥施用率,对玉米产量和氮吸收情况的三年试验结果进行分析对比。三年中玉米产量有二年受到水分不足的影响。在不施用氮肥时,免耕玉米三年平均产量明显低于耕作玉米的平均产量;但在氮肥施用量为150公斤/公顷和200公斤/公顷时,免耕玉米的平均产量则高于耕作玉米的平均产量。在水分不影响玉米收成的年份中,在不施氮肥的处理中免耕玉米产量低于耕作玉米;但两种耕作方式下玉米的最高产量相同。试验证明,干早年份免耕玉米产量较高的原因是其具有较多的植物有效水分。对两种耕作方式下三年平均产量的二次线性高峰区域与氮肥效率函数的分析表明,籽实产量为8.53吨/公顷和9.05吨/公顷时,耕作玉米及免耕玉米的最佳经济氮肥施用量分别为140公斤N/公顷和164公斤N/公顷。耕作对氮肥使用效率的影响决玉于所使用的“效率”一词的定义,但两种耕作方式下不同定义的肥效差异并不大。
In this study, we analyzed and compared the three-year experiment results of different nitrogen application rate, corn yield and nitrogen absorption under the two tillage modes. Three years of maize production has been affected by insufficient water for two years. Three-year average yield of no-tillage maize was significantly lower than that of cultivated maize when no N fertilizer was applied. However, the average yield of no-tillage maize was higher than that of cultivated maize at nitrogenous fertilizer rates of 150 kg / ha and 200 kg / ha The average yield. In years where moisture did not affect maize harvest, no-tillage maize was produced less than tillage maize in the no-N treatment; however, the highest maize yield was the same for both tillage practices. The experiment shows that the reason for the higher yield of no-till corn in dry years is that it has more plant-effective moisture. The analysis of the quadratic linear peak area and the nitrogen efficiency efficiency of three-year average yield under the two tillage methods showed that the optimum economic nitrogen fertilizer application of tillage corn and no-tillage corn was 8.53 tons / ha and 9.05 tons / ha The rates were 140 kg N / ha and 164 kg N / ha respectively. The effect of farming on the efficiency of nitrogen use depends on the definition of “efficiency” used, but there is little difference between the different definitions of fertilizer efficiency under the two tillage methods.