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在北京市郊区设施菜地对夏季敞棚休闲期甜玉米不同株距和不同播期进行试验,研究高效吸氮、有效减少NO3--N淋溶同时有较好经济效益的甜玉米种植模式。结果显示,以83 cm大行距、50 cm小行距、26 cm株距为最佳行株距,吸氮量达289 kg/hm2,收获后0～200 cm土层NO3--N含量减少649 kg/hm2,鲜穗产量达到19 573kg/hm2,均显著优于其他行株距处理(P<0.05)。甜玉米提前10 d播种(比休闲开始当日提前10 d)为最佳播期,吸氮量达到328 kg/hm2,收获后0～200 cm土层NO3--N含量减少357.7 kg/hm2,鲜穗产量达19 853 kg/hm2,显著优于其他播期处理(P<0.05)。
In the suburbs of Beijing, the vegetable garden was used to test the different plant spacing and sowing date of sweet corn during the summer open - shed leisure period. The research was on the sweet corn planting mode with high efficiency of nitrogen uptake, effective reduction of NO3 - N leaching and good economic benefit. The results showed that the optimum nitrogen level was 289 kg / hm2 with the row spacing of 83 cm, the row spacing of 50 cm and the row spacing of 26 cm. The content of NO3 - N in the layer of 0 ~ 200 cm after harvest decreased by 649 kg / hm2 , Fresh ear production reached 19 573kg / hm2, were significantly better than other lines spacing treatment (P <0.05). The sweet corn was planted 10 days ahead of schedule (10 days ahead of the start of leisure), the nitrogen uptake was 328 kg / hm2, and the NO3 - N content of 0-200 cm soil layer after harvest decreased 357.7 kg / hm2 Spike yield reached 19 853 kg / hm2, which was significantly better than other sowing dates (P <0.05).