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Acta Agron Sin ›› 2010, Vol. 36 ›› Issue (12): 2162-2169.doi: 10.3724/SP.J.1006.2010.02162

• TILLAGE & CULTIVATION·PHYSIOLOGY & BIOCHEMISTRY • Previous Articles     Next Articles

Effects of Plant Densities on Cottonseed Biomass, Fat and Protein Contents

ZHU Li-Li,ZHOU Zhi-Guo,ZHAO Wen-Qing,MENG Ya-Li*,CHEN Bing-Lin,LÜ Feng-Juan   

  1. Key Laboratory of Crop Growth Regulation, Ministry of Agriculture, Nanjing Agricultural University, Nanjing 210095, China
  • Received:2010-03-10 Revised:2010-07-04 Online:2010-12-12 Published:2010-10-09
  • Contact: MENG Ya-Li, E-mail: giscott@njau.edu.cn, Tel: 025-84396813

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Abstract: Two cotton cultivars (Kemian 1 and NuCOTN) were used in the field experiments in Nanjing (118º50′E, 32º02′N, Middle Lower Reaches of Yangtze River Valley) and Anyang (114°13′E, 36°04′N, Yellow River Valley). The results showed that under the different plant densities, the cumulative process of cottonseed biomass and fat content met Logistic growth curve. As the plant densities increased, cottonseed biomass and fat content decreased and were strongly negatively correlated with plant densities at both experimental sites and flowering dates. However, the curve of cumulative process of cottonseed protein content was similar to “V” for each treatment. A highly significant quadratic relationship was existed between cottonseed protein content and plant densities for varieties, sites, and flowering dates. The highest cottonseed protein content was obtained under 3.3×105 plants ha–1 in Nanjing and 5.1×105 plants ha–1 in Anyang, respectively. Variety, site, and flowering date had no significant effects on the dynamic changes of cottonseed biomass, fat and protein contents. The impacts of plant densities on cottonseed quality were closely related to canopy light conditions. Low plant densities helped the improvement of cottonseed biomass and fat content, while the too high or too low plant densities were not conducive to cottonseed protein synthesis and accumulation.

Key words: Cotton (Gossypium hirsutum L.), Plant densities, Cottonseed index, Cottonseed fat, Cottonseed protein

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