High Yield Achieved by Early‐Maturing Rapeseed with High Light Energy and Temperature Production Efficiencies under Ideal Planting Density. Issue 1 (1st January 2019)

• Record Type: Journal Article
• Authors: Xu, Zhenghua; Luo, Tao; Rao, Na; Yang, Liang; Liu, Jiahuan; Zhang, Chunni; Hu, Liyong
• Is Part Of: Crop science. Volume 59:Issue 1(2019)
• Page Start: 351
• Page End: 362
• Publication Date: 2019-01-01
• Subjects: Crop science -- Periodicals; Cultures -- Périodiques; Cultures de plein champ -- Périodiques; Crop science; Nutzpflanzen; Zeitschrift; Pflanzenbau; Periodicals; 633
• DOI: 10.2135/cropsci2018.04.0255
• Languages: English
• ISSNs: 0011-183X

Abstract

Abstract : Early‐maturing rapeseed ( Brassica napus L.) can alleviate the seasonal conflict between double‐season rice ( Oryza sativa L.) and rapeseed in the Yangtze River basin. In this study, the early‐maturing rapeseed 'Shengguang 127' and intermediate‐maturing cultivar 'Huayouza 9' (control) were sown on 2 October under five different planting densities (150, 000 [D1], 300, 000 [D2], 450, 000 [D3], 600, 000 [D4], and 750, 000 plants ha −1 [D5]) during two growing seasons. The patterns of change in growth and development, yield, and yield components were investigated systematically to reveal the light energy and temperature production efficiencies and to quantify the ideal plant density for the early‐maturing cultivar. The results showed that the early‐maturing genotype advanced the whole growth period by 3 to 5 d under the same densities, compared with those of the intermediate‐maturing genotype. The yield and population dry matter weight of both cultivars decreased after an initial increase, with the density increased initially from the D1 to D3 treatment, where it reached a maximum, and then decreased to the D5 treatment. Similar trends were observed in the light and temperature production efficiencies. Under the same densities, the production efficiencies of light energy and temperature in Shengguang 127 were 14.7 to 24.2% higher than those of the control, respectively; the yield and harvest indices in Shengguang 127 were significantly higher than those in Huayouza 9, which was attributed to the significantly higher 1000‐seed weight. These results provide a theoretical basis for the agronomic management and breeding of high‐yielding traits of early‐maturing rapeseed in the Yangtze River basin.