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氮肥过量使用导致玉米倒伏,限制了玉米产量潜力的发挥,而作物化控技术可以有效解决玉米倒伏,但有关寒地春玉米氮肥与化控技术互作缺乏深入研究。本研究以郑单958和先玉335为材料,在不同氮肥水平下于玉米拔节初期(七片展开叶)叶面喷施植物生长调节剂30%己·乙水剂,研究寒地春玉米氮肥与调节剂的互作效应。试验结果表明,随氮肥施用量增加,玉米株高和穗位增高,茎叶夹角和基部第3节间长度增大,节间氮积累量增加,而叶面积指数(LAI)、节间直径、碳含量和木质素含量呈先增加后减少趋势,但节间碳氮比和抗折力随施氮量增加有下降趋势。中氮水平(180kg/hm2)改善了玉米冠层结构,促进了产量提高。30%己·乙水剂处理降低了株高和穗位高,减小了茎叶夹角和LAI,缩短了第3节间长,增加了节间直径、碳含量、木质素含量、碳氮比和抗折力,提高了植株的抗倒伏性,产量得到提高。研究结果表明,180kg/hm2的氮肥施用与30%己·乙水剂叶面喷施玉米产量最高,株型、群体结构和抗倒力最佳,是寒地春玉米氮肥与化控技术互作的最佳模式。
Excessive use of N fertilizer leads to lodging of corn, which limits the potential of corn yield. However, crop chemical control technology can effectively solve the problem of maize lodging. However, there is a lack of deep research on the interaction between nitrogen fertilizer and chemical control technology in spring maize. In this study, Zhengdan958 and Xiangyu335 were used as materials to plant 30% hexyl-ethyl acetate at the early stage of corn jointing (seven leaves) under different levels of nitrogen fertilizer to study the effect of nitrogen fertilizer Interactions with regulators. The results showed that with the increase of nitrogen application rate, plant height and ear height increased, the angle between stems and leaves and the third internode increased, and the accumulation of nitrogen in internodes increased, while leaf area index (LAI) and internode diameter , Carbon content and lignin content increased first and then decreased, but the internode carbon and nitrogen ratio and the flexural resistance decreased with the increase of nitrogen application rate. Medium nitrogen levels (180 kg / hm2) improved canopy structure and increased yield. The treatment of 30% hexyl ethyl ketone reduced the plant height and ear height, decreased the angle between shoots and LAI, shortened the length of the third node, increased the internode diameter, carbon content, lignin content, carbon and nitrogen Ratio and resistance to stress, improve plant lodging resistance, yield has been improved. The results showed that the yield of maize was the highest with 180 kg / hm2 of nitrogen application and 30% of the water with the application of foliar spray, and the plant type, population structure and anti-dumping power were the best. The best mode