论文部分内容阅读
连续三年的试验研究了不同氮肥施用量对玉米各生育期叶片、籽粒中氮、磷含量及N/P_2O_5比值的影响,以及它们与产量之间的关系。试验结果表明,玉米叶片内的氮含量随施氮量的增加而增大;籽粒含氮量在氮肥用量超过25公斤以后变化不大;除小喇叭口期外,叶片中P_2O_5含量的变化趋势与氮素相同。本试验的条件下,产量随施氮量的增加而提高,以亩施15公斤氮素经济效益最佳,小喇叭口期玉米叶片中氮含量及N/P_2O_5比值与产量呈显著正相关,此值可作为预测产量的指标。
The effects of different nitrogen rates on nitrogen and phosphorus contents and N / P 2 O 5 ratios in leaves and kernels of maize at different growth stages were studied in succession for three years and their relationships with yield were studied. The results showed that the content of nitrogen in maize leaf increased with the increase of nitrogen application rate. The nitrogen content of kernel did not change much after the nitrogen application rate exceeded 25 kg. The trend of P_2O_5 content in leaves except for the small trumpet The same nitrogen. Under the conditions of this experiment, the yield increased with the increase of N application rate. Nitrogen content of 15 kg N mu per mu was the best. The nitrogen content and the N / P_2O_5 ratio in the leaves of maize were significantly positively correlated with the yield, Value can be used as an indicator to predict production.