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Acta Prataculturae Sinica ›› 2020, Vol. 29 ›› Issue (2): 82-91.DOI: 10.11686/cyxb2019199

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Effect of different sowing rates and row spacings on seed yield of Avena sativa cv. Qingyan No.1

LIU Kai-qiang, LIU Wen-hui*, WEI Xiao-xing, JIA Zhi-feng, SHI Zheng-hai   

  1. Key Laboratory of Superior Forage Germplasm in the Qinghai-Tibetan Plateau, Qinghai Academy of Animal Science and Veterinary Medicine, Qinghai University, Xining 810016, China
  • Received:2019-03-21 Revised:2019-05-19 Online:2020-02-20 Published:2020-02-20
  • Contact: E-mail: qhliuwenhui@163.com

Abstract: In order to clarify the optimal seeding rate, and row spacing or sowing method for Avena sativa grown as a grain crop in Qinghai Province, a two-factor field experiment was set up, comprising four sowing rates (S1, 135; S2, 180; S3, 225; and S4, 270 kg·ha-1), and five row spacing or planting method treatments (R1, 15 cm drilled; R2, 20 cm drilled; R3, 25 cm drilled; R4, 30 cm drilled; R0, broadcast), of cultivar Qingyan No.1. The experiment therefore had 20 treatment combinations, and there were three replicates. The research focused on seed yield and its contributing traits, and stalk yield. The research aim was to identify scientific principles and cultivation techniques to achieve a high-yield of this variety. It was found that seed yield and stalk yield differed significantly (P<0.05) between sowing rates and row spacing or planting patterns. The highest seed yield (7937 kg·ha-1) was achieved using the sowing rate S3 and row spacing R2, while the highest stalk yield (11873 kg·ha-1) was achieved using the sowing rate S4 and row spacing R1. With broadcast sowing rates higher or lower than S3, the seed yield was decreased, and the seed yield at S3 (averaged over row spacings) was 1.51 times higher than the lowest yield, which occurred at S1. The effect of drilling compared with broadcast sowing was obvious. The highest seed yield among the drilling treatments (S3R2) was significantly (P<0.05) higher than that of the comparable broadcast sowing (S3R0). According to the correlation analysis between yield and yield traits, the number of spikelets, number of florets, inflorescence length, leaf area, number of effective tillers, seed number per spikelet, seed number per inflorescence, thousand seed weight and seed weight per inflorescence were significantly (P<0.05) correlated with yield. Further, using multiple regression and a path analysis approach, it was found that number of spikelets, thousand seed weight and seed weight per inflorescence had a major influence on seed yield, with both direct and indirect effects. Therefore, seed number per inflorescence, thousand seed weight and seed weight per inflorescence are the traits most amenable to manipulation by appropriate cultivation measures to improve oat seed yield.

Key words: sowing rate, row spacing, seed yield, path analysis