Effects of Plant Density on Yield and Canopy Micro Environment in Hybrid Cotton

doi:10.1016/S2095-3119(13)60727-3

Journal of Integrative Agriculture ›› 2014, Vol. 13 ›› Issue (10): 2154-2163.DOI: 10.1016/S2095-3119(13)60727-3

Effects of Plant Density on Yield and Canopy Micro Environment in Hybrid Cotton

YANG Guo-zheng, LUO Xue-jiao, NIE Yi-chun , ZHANG Xian-long

1、College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, P.R.China
2、Key Laboratory of Crop Ecophysiology and Farming System in Middle Reaches of the Yangtze River, Ministry of Agriculture, Wuhan 430070,
P.R.China

收稿日期:2013-09-05 出版日期:2014-10-01 发布日期:2014-10-10
通讯作者: YANG Guo-zheng, Tel: +86-27-87282130, Fax: +86-27-87282131, E-mail: ygzh9999@mail.hzau.edu.cn
作者简介:YANG Guo-zheng, Tel: +86-27-87282130, Fax: +86-27-87282131, E-mail: ygzh9999@mail.hzau.edu.cn
基金资助:
The study was supported by Special Fund for Agro-scientific Research in the Public Interest, China (3-5-19), the Modern Agro-Industry Technology Research System, China (Cotton 2007-2010) and the National Transgenic Cotton Production Program, China (2009ZX08013-014B).

Effects of Plant Density on Yield and Canopy Micro Environment in Hybrid Cotton

YANG Guo-zheng, LUO Xue-jiao, NIE Yi-chun , ZHANG Xian-long

1、College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, P.R.China
2、Key Laboratory of Crop Ecophysiology and Farming System in Middle Reaches of the Yangtze River, Ministry of Agriculture, Wuhan 430070,
P.R.China

Received:2013-09-05 Online:2014-10-01 Published:2014-10-10
Contact: YANG Guo-zheng, Tel: +86-27-87282130, Fax: +86-27-87282131, E-mail: ygzh9999@mail.hzau.edu.cn
About author:YANG Guo-zheng, Tel: +86-27-87282130, Fax: +86-27-87282131, E-mail: ygzh9999@mail.hzau.edu.cn
Supported by:
The study was supported by Special Fund for Agro-scientific Research in the Public Interest, China (3-5-19), the Modern Agro-Industry Technology Research System, China (Cotton 2007-2010) and the National Transgenic Cotton Production Program, China (2009ZX08013-014B).

摘要/Abstract

摘要： A rational plant population is an important attribute to high yield of cotton, because it can provide a beneficial micro environment within the canopy for plant growth and development as well as yield formation. A 2-yr field experiment was conducted to determine the optimal plant density based on cotton yield in relation to the canopy micro environment (canopy temperature, relative humidity and light transmittance). Six plant densities (1.2-5.7 plants m-2) were arranged with a completely randomized block design. The highest cotton yield (1 507 kg ha-1) was obtained at 3.0 plants m-2 due to more bolls per unit ground area (79 bolls m-2), while the lowest yield (1 091 kg ha-1) was obtained at 1.2 plants m-2. Under the moderate plant density (3.0 plants m-2), there was a lower mean daily temperature (MDT, 27.1°C) attributing to medium daily minimum temperature (Tmin, 21.9°C) and the lowest daily maximum temperature (Tmax, 35.8°C), a moderate mean canopy light transmittance of 0.51, and lower mean daily relative humidity (MRH) of 79.7% from June to October. The results suggest that 3.0 plants m-2 would be the optimal plant density because it provides a better canopy micro environment.

关键词: cotton , canopy environment , plant density , yield , light transmittance

Abstract: A rational plant population is an important attribute to high yield of cotton, because it can provide a beneficial micro environment within the canopy for plant growth and development as well as yield formation. A 2-yr field experiment was conducted to determine the optimal plant density based on cotton yield in relation to the canopy micro environment (canopy temperature, relative humidity and light transmittance). Six plant densities (1.2-5.7 plants m-2) were arranged with a completely randomized block design. The highest cotton yield (1 507 kg ha-1) was obtained at 3.0 plants m-2 due to more bolls per unit ground area (79 bolls m-2), while the lowest yield (1 091 kg ha-1) was obtained at 1.2 plants m-2. Under the moderate plant density (3.0 plants m-2), there was a lower mean daily temperature (MDT, 27.1°C) attributing to medium daily minimum temperature (Tmin, 21.9°C) and the lowest daily maximum temperature (Tmax, 35.8°C), a moderate mean canopy light transmittance of 0.51, and lower mean daily relative humidity (MRH) of 79.7% from June to October. The results suggest that 3.0 plants m-2 would be the optimal plant density because it provides a better canopy micro environment.

Key words: cotton , canopy environment , plant density , yield , light transmittance

YANG Guo-zheng, LUO Xue-jiao, NIE Yi-chun , ZHANG Xian-long. Effects of Plant Density on Yield and Canopy Micro Environment in Hybrid Cotton[J]. Journal of Integrative Agriculture, 2014, 13(10): 2154-2163.

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Effects of Plant Density on Yield and Canopy Micro Environment in Hybrid Cotton

Effects of Plant Density on Yield and Canopy Micro Environment in Hybrid Cotton

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