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中国油料作物学报 ›› 2019, Vol. 41 ›› Issue (3): 324-.doi: 10.7505/j.issn.1007-9084.2019.03.003

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Dry matter accumulation and NPK absorption and utilization of rapeseed for oilseed-vegetable

  

  1. 1. Institute of Characteristic Crop Research, Chongqing Academy of Agricultural Sciences, Chongqing 402160, China; 
    2. Science and Technology Department, Chongqing Academy of Agricultural Sciences, Chongqing 401329, China
  • Online:2019-06-28 Published:2019-09-02

Abstract: To achieve effective fertilizer rates on rapeseed (Brassica napus L.) for oilseed-vegetable dual purposes, plant nutrient traits were investigated on stalk-cut and stalk-free (CK) plants from bolting to mature. 2 years data of dry matter accumulation, nutrient absorption and distribution were compared. Results showed that the growth period, branch structure, dry matter accumulation, nutrient absorption and utilization on stalk-cut rapeseed changed dramaticaly. After cut, plants had lower seed yield but greater dry matter. It had 8 d extention on growth period. The plants were early branched, and had more secondary branches with an average of 19.2 per plant. The seed yield was mainly obtained from the secondary branches. The content of NPK (nitrogen, phosphorus and potassium) decreased with the growth processes, and the content in siliques was much higher than that in root and stem during maturing. Because of the wound, dry matter accumulation and NPK absorption were increased slowly during the first 20 d after cut. Then the absorption increased rapidly. NPK accumulation on stalk-cut plants was higher than that of stalk-free during maturing. For stalk-cut plants, the secondary branches were dominant in canopy, which had more flower and greater silique dry matter as well as N accumulation than that of the primary branches. Because of longer growth period, the duration of dry matter and nutrient accumulation were prolonged after the cut. In summary, stalk-cut rapeseed had different characteristics on fertilizer requirement from oilseed-vegetable dual-purpose production of rapeseed, which suggested a very different fertilization management. 

Key words: Brassica napus L., oilseed-vegetable double use, dry matter, nitrogen, phosphorus, potassium, secondary branches