化控后移对不同密度玉米产量构成和籽粒灌浆特性的影响
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S513;S482.8

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国家重点研发计划项目(2017YFD0300603);吉林省农业科学院创新团队项目(CXGC2017TD011)


Effect of Postponing Chemical Regulation on Yield Components and Grain Filling Characteristics under Different Densities of Maize
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    摘要:

    以玉米品种先玉335为供试材料,在大田条件下设2个种植密度(常规密度6万株/hm2和高密度9万株/hm2,分别记作D6和D9)进行试验,每个密度设置4个处理(对照TCK、8叶期化控T8、15叶期化控T15、8和15叶期两次化控T8+15),探讨化控时期后移至15叶期的T15和T8+15处理对不同密度处理下玉米籽粒灌浆特性的影响,通过Logistic方程拟合籽粒灌浆过程,解析灌浆特征参数与粒重的关系。研究结果表明,化控后移处理T15和T8+15与常规化控处理T8比较,可以提高籽粒灌浆速率,粒重快增期的籽粒灌浆速率在常规密度下分别提高35.1%和15.5%,在高密度下分别提高5.0%和3.3%。高密度下T15处理较T8处理的活跃灌浆时间和有效灌浆时间分别延长2.8 d和4.0 d。通过化控后移可以提高前期的灌浆速率,延长籽粒灌浆持续时间,达到玉米增产的目的。

    Abstract:

    Using the maize variety Xianyu 335 and self-made plant growth regulator as experimental material, field experiments were conducted with four chemical regulation treatments(TCK: no spray; T8: spray at the eight-leaf; T15:spray at the fifteen-leaf; T8+15: twice spray at eight and fifteen leaf)and two planting densities(60 000 plants/ha as normal density and 90 000 plants/ha as high density, recorded D6 and D9, respectively) to discuss the effect of postponing chemical regulation stage to fifteen-leaf on grain filling characteristics of maize under different densities.The grain filling process was fitted by Logistic equation and the relationship between grain weight and characteristic parameters of grain filling was analyzed. The results showed that compared with the conventional chemical control treatment, T15 and T8+15 could increase the grain filling rate. The grain filling rate at the rapid growth stage of grain weight increased by 35.1% and 15.5% respectively under the conventional density, and increased by 5.0% and 3.3% respectively under the high density. The active grouting time and effective grouting time of T15 under high density were extended by 2.8 d and 4.0 d respectively compared with T8. The grain filling duration could be prolonged and the grain filling rate could be increased by postponing chemical regulation.

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杨粉团,孔凡丽,张兆琴,曹庆军,李刚,于洪浩,李贺.化控后移对不同密度玉米产量构成和籽粒灌浆特性的影响[J].东北农业科学,2020,45(6):14-18.

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  • 收稿日期:2018-12-28
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  • 在线发布日期: 2024-11-26
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