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在大田条件下调查了剪叶对叶片与籽粒间碳水化合物及植物内源激素源库关系的调节作用，并用挂瓶渗透法研究了某些植物生长调节剂对果穗性状的作用效果。结果表明：剪叶不仅限．制了叶源端碳水化合物向籽粒库的供应，而且也改变了果穗穗轴的内源激素平衡．吐丝后１２天内剪叶处理使穗轴内源ＡＢＡ含量较对照显著下降．吐丝后至开始灌浆前，１ｍｇ／ｋｇ的外源ＩＡＡ处理使穗长增加，对结实无显著影响，但开始灌浆后，ＩＡＡ处理使使粒数增加．ＩＡＡ处理还出现较多奇数穗行的果穗，在１～５０ｍｇ／ｋｇ范围内随浓度增高而增多，最多可达１／３；吐丝后５～８天内１０ｍｇ／ｋｇ的外源ＧＡｓ处理，使秕粒数显著增加，而同期的１ｍｇ／ｋｇ的外源ＡＢＡ处理，使秕粒数显著降低，因而千粒重增加。
Under field conditions, the regulatory effect of cutting leaves on the relationship between carbohydrate and endogenous hormones in leaves and kernels was investigated. The effects of some plant growth regulators on ear traits were also studied by using the peg-in-bottle method. The results show that: cutting leaves is not limited. The supply of leaf-sourced carbohydrates to the grain bank also changed the endogenous hormonal balance of the tassel cob. Leaf cutting within 12 days after silking resulted in a significant decrease of endogenous ABA content in the cob as compared with the control. Exogenous IAA at 1 mg / kg increased the spike length after silking until the start of grain filling, but had no significant effect on seed setting. However, IAA treatment increased the grain number after the start of grain filling. IAA treatment also showed more ears with odd number of ears, which increased with the increase of concentration in the range of 1 ~ 50mg / kg, up to 1/3; treatment with exogenous GAs at 10mg / kg within 5 ~ 8 days after silking The number of grains increased significantly, while the same period of 1mg / kg of exogenous ABA treatment, the number of grains significantly reduced, so 1000-grain weight gain.