Boll characteristics and yield of cotton in relation to the canopy microclimate under varying plant densities in an arid area

Planting density affects crop microclimate and intra-plant competition, playing an important role on yield formation and resource use, especially in areas where the cotton is grown at relatively high plant densities in Xinjiang, China. However, more studies are needed to examine how the change in pl...

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Autores principales: Na Zhang, Liwen Tian, Lu Feng, Wenxiu Xu, Yabing Li, Fangfang Xing, Zhengyi Fan, Shiwu Xiong, Jianghua Tang, Chunmei Li, Ling Li, Yunzhen Ma, Fang Wang
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Publicado: PeerJ Inc. 2021
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spelling oai:doaj.org-article:4e862c33187c4acd8eb0cb00c0125df72021-12-04T15:05:05ZBoll characteristics and yield of cotton in relation to the canopy microclimate under varying plant densities in an arid area10.7717/peerj.121112167-8359https://doaj.org/article/4e862c33187c4acd8eb0cb00c0125df72021-12-01T00:00:00Zhttps://peerj.com/articles/12111.pdfhttps://peerj.com/articles/12111/https://doaj.org/toc/2167-8359Planting density affects crop microclimate and intra-plant competition, playing an important role on yield formation and resource use, especially in areas where the cotton is grown at relatively high plant densities in Xinjiang, China. However, more studies are needed to examine how the change in planting density affects the microclimate factors such as the fraction of light intercepted (FLI), air temperature(T) and relative humidity (RH) within different canopy layers, which in turn affect the boll number per plant (BNF), boll number per unit area (BNA), boll weight (BW), and boll-setting rate (BSR) at fruiting branch (FB) positions FB1–3, FB4–6, and FB≥7 in cotton. To quantify the relationships between boll characteristics, yield, and microclimate factors, we conducted a 2-year field experiment in 2019–2020 in Xinjiang with six plant densities: 9 (P1), 12 (P2), 15 (P3), 18 (P4), 21 (P5), and 24 (P6) plants m−2. With each three plants m−2 increase in density, the average FLI and RH across different canopy layers increased by 0.37 and 2.04%, respectively, whereas T decreased by 0.64 °C. The BNF at FB≥ 7, FB4–6, and FB1–3 decreased by 0.82, 0.33, and 0.5, respectively. The highest BNA was observed in the upper and middle layers in the P4 treatment and in the lowest canopy layer with the P5. The highest BW was measured in the middle canopy layer for P3, and the highest BSR was measured in the lower layer for P3. Plant density exhibited linear or quadratic relationships with FLI, T, and RH. Microclimate factors mainly affected the boll number in each layer, but had no significant effects on the BW in any layer or the BSR in the middle and lower layers. Cotton yield was non-linearly related to plant density. The 2-year maximum yield was achieved at a plant density of 21 plants m−2, but the yield increase compared to the yield with a density of 18 plants m−2was only 0.28%. Thus, we suggest that the optimal plant density for drip-irrigated cotton in Xinjiang is 18 plants m−2, which could help farmers grow machine-harvested cotton.Na ZhangLiwen TianLu FengWenxiu XuYabing LiFangfang XingZhengyi FanShiwu XiongJianghua TangChunmei LiLing LiYunzhen MaFang WangPeerJ Inc.articleYield-density relationshipBoll distributionPlant densityFraction of light interceptedCanopy temperature and humidityMedicineRENPeerJ, Vol 9, p e12111 (2021)
institution DOAJ
collection DOAJ
language EN
topic Yield-density relationship
Boll distribution
Plant density
Fraction of light intercepted
Canopy temperature and humidity
Medicine
R
spellingShingle Yield-density relationship
Boll distribution
Plant density
Fraction of light intercepted
Canopy temperature and humidity
Medicine
R
Na Zhang
Liwen Tian
Lu Feng
Wenxiu Xu
Yabing Li
Fangfang Xing
Zhengyi Fan
Shiwu Xiong
Jianghua Tang
Chunmei Li
Ling Li
Yunzhen Ma
Fang Wang
Boll characteristics and yield of cotton in relation to the canopy microclimate under varying plant densities in an arid area
description Planting density affects crop microclimate and intra-plant competition, playing an important role on yield formation and resource use, especially in areas where the cotton is grown at relatively high plant densities in Xinjiang, China. However, more studies are needed to examine how the change in planting density affects the microclimate factors such as the fraction of light intercepted (FLI), air temperature(T) and relative humidity (RH) within different canopy layers, which in turn affect the boll number per plant (BNF), boll number per unit area (BNA), boll weight (BW), and boll-setting rate (BSR) at fruiting branch (FB) positions FB1–3, FB4–6, and FB≥7 in cotton. To quantify the relationships between boll characteristics, yield, and microclimate factors, we conducted a 2-year field experiment in 2019–2020 in Xinjiang with six plant densities: 9 (P1), 12 (P2), 15 (P3), 18 (P4), 21 (P5), and 24 (P6) plants m−2. With each three plants m−2 increase in density, the average FLI and RH across different canopy layers increased by 0.37 and 2.04%, respectively, whereas T decreased by 0.64 °C. The BNF at FB≥ 7, FB4–6, and FB1–3 decreased by 0.82, 0.33, and 0.5, respectively. The highest BNA was observed in the upper and middle layers in the P4 treatment and in the lowest canopy layer with the P5. The highest BW was measured in the middle canopy layer for P3, and the highest BSR was measured in the lower layer for P3. Plant density exhibited linear or quadratic relationships with FLI, T, and RH. Microclimate factors mainly affected the boll number in each layer, but had no significant effects on the BW in any layer or the BSR in the middle and lower layers. Cotton yield was non-linearly related to plant density. The 2-year maximum yield was achieved at a plant density of 21 plants m−2, but the yield increase compared to the yield with a density of 18 plants m−2was only 0.28%. Thus, we suggest that the optimal plant density for drip-irrigated cotton in Xinjiang is 18 plants m−2, which could help farmers grow machine-harvested cotton.
format article
author Na Zhang
Liwen Tian
Lu Feng
Wenxiu Xu
Yabing Li
Fangfang Xing
Zhengyi Fan
Shiwu Xiong
Jianghua Tang
Chunmei Li
Ling Li
Yunzhen Ma
Fang Wang
author_facet Na Zhang
Liwen Tian
Lu Feng
Wenxiu Xu
Yabing Li
Fangfang Xing
Zhengyi Fan
Shiwu Xiong
Jianghua Tang
Chunmei Li
Ling Li
Yunzhen Ma
Fang Wang
author_sort Na Zhang
title Boll characteristics and yield of cotton in relation to the canopy microclimate under varying plant densities in an arid area
title_short Boll characteristics and yield of cotton in relation to the canopy microclimate under varying plant densities in an arid area
title_full Boll characteristics and yield of cotton in relation to the canopy microclimate under varying plant densities in an arid area
title_fullStr Boll characteristics and yield of cotton in relation to the canopy microclimate under varying plant densities in an arid area
title_full_unstemmed Boll characteristics and yield of cotton in relation to the canopy microclimate under varying plant densities in an arid area
title_sort boll characteristics and yield of cotton in relation to the canopy microclimate under varying plant densities in an arid area
publisher PeerJ Inc.
publishDate 2021
url https://doaj.org/article/4e862c33187c4acd8eb0cb00c0125df7
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