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Chinese Agricultural Science Bulletin ›› 2024, Vol. 40 ›› Issue (32): 37-43.doi: 10.11924/j.issn.1000-6850.casb2024-0086

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Effects of Different Cultivation Factor Combinations on Agronomic Traits and Yield Benefits of No-tillage Forage Rape in Mountainous Areas

YANG Jincheng1(), LIU Jianjian1, HE Quan2, ZHANG Zhong1, LIU Ying3, SHI Lanfen4, LI Yanlan1, HU Xinzhou1, WANG Aiming5, YANG Xiaobo2, BAI Tingyu5, LI Xiang1, PU Jiafu4, BAI Yuecai4()   

  1. 1 Yuxi Academy of Agricultural Sciences, Yuxi, Yunnan 653100
    2 Eshan Branch of Yuxi Tobacco Company, Eshan, Yunnan 653200
    3 Yuxi Rural Economic Management Station, Yuxi, Yunnan 653100
    4 Tadian Town Agriculture and Rural Comprehensive Service Center, Eshan, Yunnan 653200
    5 Eshan County Agricultural Comprehensive Service Center, Eshan, Yunnan 653200
  • Received:2024-02-06 Revised:2024-05-27 Online:2024-11-15 Published:2024-11-12

Abstract:

In order to scientifically put forward the optimal cultivation factor combination of sowing density and fertilizer amount for no-tillage forage rape in mountainous areas, the agronomic traits and yield benefits of no-till mountain forage rape with 9 cultivation factors combined in the same high-altitude pilot in Yuxi from 2019 to 2021 were compared using grey correlation degree and stepwise regression analysis methods. The results showed, (1) the growth period was shortened with the delay of sowing date, the growth period of the last two sowing dates were 10 d and 20 d shorter than that of the first date. (2) Plant height, effective number of corner fruits per plant, fresh forage weight per plant and yield of fresh harvested grass showed a decreasing trend with the delay of sowing date. (3)The correlation degree between forage yield and main agronomic factors was significantly different in different cultivation combinations. (4) The fresh grass yield of 9 combinations in different years had different degrees of difference. (5) With the delay of sowing date, the output value and benefit of rape forage grass showed an obvious decreasing trend. The optimal cultivation factor combination of forage rape in high altitude mountainous areas is sowing on September 20 + planting density 3.0×105-3.6×105 plants/hm2 + urea application amount at 5 leaf stage 450-525 kg/hm2.

Key words: mountain forage rape, high-altitude, cultivation factor, grey correlation degree and item by item regression analysis, agronomic character, yield benefit