缩节胺复配打顶剂对机采棉冠层结构、光合特性及产量的影响

Effects of the compound topping agent of DPC on the canopy structure, photosynthetic characteristics and yield of machine-picked cotton

    摘要
  • 摘要: 【目的】 研究缩节胺复配打顶剂对机采棉冠层结构、光合特性及产量的影响。 【方法】 2021年以新陆中88号为材料,采用双因素裂区试验设计,二因素为缩节胺和打顶处理,缩节胺包括2个水平,喷施缩节胺(H1)和不喷施缩节胺(H0);打顶包括3个水平,打顶剂喷施(D1)、人工打顶(D2)和不打顶(D3)。 【结果】 在各处理中H1处理较H0处理可以显著提高棉花的平均叶簇倾角、群体散射辐射透过系数、叶绿素SPAD值和净光合速率,增幅分别为16.0%、25.5%、8.9%、18.1%;D1处理较D2处理可以显著提高棉花的叶面积指数、平均叶簇倾角、群体散射辐射透过系数、叶绿素SPAD值和净光合速率,增幅分别为16.9%、11.0%、16.1%、3.2%、10.9%;H1处理较H0处理单株结铃数、单铃重分别增加了43%、9.8%,存在显著差异;D1处理单株结铃数较D2、D3处理,分别平均增加了9.2%、31.9%,单铃重分别平均增加了4.0%、11.7%。棉花的籽棉产量以H0D3处理最低,为3 350.7 kg/hm2,H1D1处理最高,为7 023.6 kg/hm2,H1D1处理较H0D3处理的籽棉产量增加了109.6%,各处理籽棉产量整体表现为D1>D2>D3。H1处理较H0处理的籽棉产量、皮棉产量分别平均增加了42.6%、42.3%。 【结论】 选用缩节胺复配打顶剂进行全程化学调控,可以塑造适宜机采棉采收的合理冠层结构和光合特性并提高棉花的产量,还可降低生产成本,增加植棉效益。

     

    Abstract: 【Objective】 To reveal the effect of DPC compound topping agent on the canopy structure, photosynthetic characteristics and yield of machine-picked cotton. 【Methods】 In 2021, Xinluzhong No.88 was used as the material, and a two-factor split zone test design was adopted.The two factors were amine and topping treatment.The amine included two levels.Spraying amine (H1) and no spray amine (H0); topping included 3 levels, topping agent spray (D1), artificial topping (D2) and no topping (D3). 【Results】 Compared with H0 treatment, H1 treatment could significantly increase the average leaf cluster inclination, colony scattered radiation transmission coefficient, chlorophyll SPAD value and net photosynthetic rate of cotton, and the increase rates were: 16.0%, 25.5%, 8.9% and 18.1%, respectively; Compared with D2 treatment, D1 treatment could significantly increase the leaf area index, average leaf cluster inclination, colony scattered radiation transmission coefficient, chlorophyll SPAD value and net photosynthetic rate of cotton, the increase rates were: 16.9%, 11.0%, 16.1%, 3.2%, 10.9%; Compared with H0 treatment, the number of bolls per plant and boll weight per plant increased by 43% and 9.8%, respectively, with significant differences; The number of bolls per plant in D1 treatment increased 9.2% and 31.9% on average compared with that of D2 and D3; The weight of single boll increased by 4.0% and 11.7%, respectively; The yield of seed cotton in H0D3 treatment was the lowest, 3,350.7 kg/hm2, and the highest in H1D1 treatment, 7,023.6 kg/hm2.Compared with H0D3, the yield of seed cotton in H1D1 treatment increased by 109.6%.The overall performance of seed cotton in each treatment was D1 >D2>D3.Compared with H0 treatment, the yield of seed cotton and lint cotton in H1 treatment increased by 42.6% and 42.3% respectively. 【Conclusion】 Choosing a compound topping agent of DPC for full chemical control can shape a reasonable canopy structure and photosynthetic characteristics suitable for machine-picked cotton harvesting and increase cotton yield, which can provide a reference for the light-simplified cultivation of machine-picked cotton and reduce production costs and increase cotton planting benefits as well.

     

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