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Chinese Agricultural Science Bulletin ›› 2023, Vol. 39 ›› Issue (14): 12-19.doi: 10.11924/j.issn.1000-6850.casb2022-0414

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Response Characteristics of Cotton Dry Matter Accumulation and Transportation to Density and Row Spacing Configuration

LIU Jintao1(), CHEN Guodong1(), WAN Sumei1, ZHAI Yunlong1, MAO Tingyong1, LUO Lei3, HU Qiang1, MA Yunzhen2, LI Yabing2(), FENG Lu2, YANG Beifang2, CAO Juan1, ZHOU Xiang1, LIN Feng1   

  1. 1 College of Agronomy/College of Cotton Science, Tarim University, Aral, Xinjiang 843300
    2 Institute of Cotton Research of CAAS, Anyang, Henan 455000
    3 College of Agronomy, Xinjiang Agricultural University, Urumqi 830000
  • Received:2022-05-12 Revised:2022-07-01 Online:2023-05-09 Published:2023-05-09

Abstract:

In order to clarify the response mechanism of dry matter accumulation and transportation and yield traits to the difference of planting density and row spacing, and promote the popularization of cotton varieties and the innovation of planting technology, in this study, ‘Zhongmiansuo 641’ was used as the experimental material, and the planting patterns of 76 cm equal row (SP) and (66 cm+10 cm) wide and narrow row (DP) were adopted. Three planting densities were set, including I: low density of 1.2×105 plants/hm2; II: medium density of 1.8×105 plants/hm2; and Ⅲ: high density of 2.4×105 plants/hm2. The Logistic curve equation was applied to analyze the data. The ∆T of cotton treated with SP Ⅱ in 2020 and 2021 was 54.7 days and 55.6 days, respectively. The duration of rapid accumulation of dry matter in vegetative organs in 2020 and 2021 was 33.3 days and 38 days, respectively, and the maximum accumulation rate was 1.13 g /(plant·d), higher than that of other treatments. The duration of rapid accumulation of dry matter in reproductive organs was 35.26 days and 25.79 days in 2020 and 2021, respectively, and the maximum accumulation rate was 1.05 g/(plant·d). The two-year experimental data showed that the dry matter conversion per plant of cotton treated with SP Ⅱ was the highest before and after anthesis. The yield of seed cotton treated with SP Ⅱ was 5359.48 kg/hm2 and 5151.00 kg/hm2 in 2020 and 2021 respectively, and the number of bolls per plant was 6.12. The response of yield to row spacing difference is stronger than that to density difference. The equal row spacing planting mode of 1.8×105 plants/hm2 is conducive to making full use of light and heat resources, promoting dry matter accumulation and transportation, and improving the yield of seed cotton.

Key words: cotton, density, row spacing configuration, dry matter, yield