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Chemical Topping and Planting Density Interactively Affect Cotton Growth and Partitioning Index

文献类型： 外文期刊

作者： Zhang, Yutong 1 ; Chen, Yongfan 1 ; Sun, Shuai 2 ; Zhang, Pengzhong 3 ; Zhang, Zeshan 1 ; Wang, Xuejiao 4 ; Tang, Xuelian 1 ; Yang, Mingfeng 5 ; Xiang, Dao 5 ; Wang, Sen 4 ; Ji, Fen 5 ; Zhang, Lizhen 1 ;

作者机构： 1.China Agr Univ, Coll Resources & Environm Sci, Agr Meteorol Dept, Beijing 100193, Peoples R China

2.China Meteorol Adm, Inst Desert Meteorol, Urumqi 830002, Peoples R China

3.Xinjiang Acad Agr Sci, China Natl Cotton R&D Ctr, Urumqi 830091, Peoples R China

4.Xinjiang Agrometeorol Observ, Urumqi 830002, Peoples R China

5.Wulanwusu Agrometeorol Stn, Shihezi 832199, Peoples R China

关键词： growth dynamics; assimilate partitioning; beta growth function; maximum dry matter; seed cotton yield; topping method

期刊名称：AGRONOMY-BASEL （ 影响因子：3.4； 五年影响因子：3.8 ）

ISSN：

年卷期： 2024 年 14 卷 12 期

页码：

收录情况： SCI

摘要： Due to the labor shortage, replacing manual topping with chemical topping has become an important practice in cotton-producing areas such as Xinjiang, China. Similarly, increasing planting density is a common strategy to enhance cotton yields. This study aimed to quantify the interactive effects of chemical topping and planting density on cotton growth and assimilate partitioning. To achieve this, a two-year (2020-2021) field experiment was conducted in Xinjiang, China. The main plots were assigned low (15 plants m-2) or high plant density (25 plants m-2), and the subplots were chemical topping using heavy amounts of mepiquat chloride (MC) or manual topping. The dynamics of dry matter accumulation and partitioning in cotton were well quantified using a beta-growth function with an overall nRMSE of 11.5%. Results indicated that chemical topping increased aboveground dry matter maximum by 4.88%, fruit dry matter maximum by 17.9% and seed cotton yield by 14.0% compared to manual topping. At low plant density, the partitioning index between vegetative and reproductive organs showed no significant differences. However, at high plant density, the time when 50% of assimilate partitioning to reproductive organs for chemical topping was 2.6 physiological days (under optimal temperature conditions) delayed than that for manual topping, resulting in a 2.7 physiological days delay in the time that fruits reached maximum growth rate. The results of the study suggest that applying chemicals for topping a little earlier in high-density planting could reduce the negative effects of delayed boll growth and promote carbon assimilate partitioning to fruit growth.

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