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以大豆品种贡选1号为试验材料,在玉米-大豆套作模式下,研究不同施氮水平下叶面喷施烯效唑对套作大豆花后碳氮代谢、干物质积累量及产量的影响。结果表明:烯效唑在不同的施氮水平下均能促进植株的碳氮代谢,提高了R5期前大豆叶和茎中的总糖及全氮含量,降低了R7期叶茎中的总糖含量,显著提高了R3~R7期叶茎中总糖含量的减少量;叶面喷施烯效唑提高了R2和R3期的碳氮比,却显著降低了R5期后的碳氮比;烯效唑提高R3~R7期的干物质积累量、有效荚数、百粒重和产量。在低(0 kg·hm-2)、中(32.4 kg·hm-2)、高氮水平(64.8 kg·hm-2)下,分别以喷施60,30和90 mg·kg-1烯效唑的干物质积累量和产量最高。综合碳氮代谢及产量的表现,玉米-大豆套作模式下以施32.4 kg·hm-2纯氮,于V5期喷施30 mg·kg-1烯效唑效果最佳。
With soybean variety Gongxuan No.1 as test material, the effects of foliar application of uniconazole on carbon and nitrogen metabolism, dry matter accumulation and yield of intercropped soybean under different nitrogen application rates were studied under maize-soybean intercropping system influences. The results showed that: Uniconazole could promote carbon and nitrogen metabolism of plants at different nitrogen levels, increase total sugar and total nitrogen in soybean leaves and stems before R5, and reduce total sugar , Significantly decreased the total sugar content in leaf stems from R3 to R7; foliar application of uniconazole increased the ratio of carbon to nitrogen in R2 and R3, but significantly reduced the ratio of carbon to nitrogen The effect of phenformin on dry matter accumulation, effective pods, 100-grain weight and yield in R3 ~ R7 period were studied. Under the conditions of low (0 kg · hm-2), medium (32.4 kg · hm-2) and high nitrogen (64.8 kg · hm-2), spraying 60, 30 and 90 mg · kg- Azole has the highest dry matter accumulation and yield. Combining the performance of carbon and nitrogen metabolism and yield, applying 32.4 kg · hm-2 of pure nitrogen in the corn-soybean intercropping system showed the best effect of spraying 30 mg · kg-1 uniconazole at the V5 stage.