烟后轮作玉米的适宜种植密度研究

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为了明确烟后轮作不同品种玉米的适宜种植密度,2020年在湖南省浏阳市达浒镇金田村以湘农甜玉3号和郑单958为材料,设置5个密度水平,其中湘农甜玉3号的种植密度分别为42000(T1)、48000(T2)、54000(T3)、60000(T4)、66000(T5)株/hm2,郑单958的种植密度分别为45000(S1)、52500(S2)、60000(S3)、67500(S4)、75000(S5)株/hm2,比较分析不同密度处理下不同品种玉米的生长发育情况和产量.结果表明:不同密度处理下,2种玉米的生育期没有显著差异;从吐丝期起,2种玉米的叶面积指数和干物质积累量均随密度增加而增加;过高的轮作密度导致湘农甜玉3号倒伏倒折率增加、秃顶变长,郑单958的总叶片数和空秆率增加、穗粒数降低;2种玉米的产量均随着密度的增加先增加后下降,湘农甜玉3号以T3处理的产量最高,郑单958则以S3处理产量最高.该地区烤烟收获后轮作甜玉米和普通玉米的最佳密度分别为54000株/hm2和60000株/hm2.
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