Effect of Density on Dry Matter and Nitrogen Accumulation and Distribution of Dwarf Rape

doi:10.7668/hbnxb.20192433

Abstract

Abstract: To investigate the response of dry matter and nitrogen accumulation and distribution of dwarf rapeseed to planting density and its difference with high-stalk varieties, in order to provide a reference for reasonable dense planting of dwarf rapeseed. Under potted conditions, choose dwarf rapeseed MJ01(V1)and tall rapeseed Chuanyou 36(V2), set up two kinds of density(2, 4 plants/pot)to study the effect of density on the dry matter and nitrogen of dwarf rapeseed. The effect of nutrient accumulation and distribution and its difference with high-stalk rape. The results showed that increasing the planting density increased the dry matter and nitrogen accumulation of dwarf rapeseed above-ground plants, increased the distribution ratio of dry matter and nitrogen in the stalk, and reduced the distribution ratio of dry matter and nitrogen in the silique shell and grain. Compared with high-stalked rape, the dry matter and nitrogen accumulation in above-ground plants of dwarf rapeseed was lower, and the distribution ratio of dry matter and nitrogen in the grain was relatively high. There was no significant difference in grain yield between dwarf rapeseed and high-stalked rape rapeseed. Increasing the planting density, the nitrogen harvest index of dwarf rapeseed increased slightly, and the economic coefficient and nitrogen physiological use efficiency showed a downward trend. Under the same density, the economic coefficient, nitrogen harvest index and nitrogen physiological use efficiency of dwarf rapeseed were higher than those of high-stalk rapeseed, but the difference is not significant. Compared with high-stalk rapeseed, dwarf rapeseed had lower dry matter and nitrogen accumulation in the above-ground plants, and higher economic coefficient, nitrogen harvest index and nitrogen physiological use efficiency. Under the suitable planting density, dwarf rapeseed can also obtain higher grain yield.

Key words: Dwarf rapeseed, Dry matter, Nitrogen, Accumulation and distribution, Density

CLC Number:

S143.1

YAN Hongmei, DUAN Qiuyu, LI Hongqiao, GUO Shixing, WU Yongcheng. Effect of Density on Dry Matter and Nitrogen Accumulation and Distribution of Dwarf Rape[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2021, 36(S1): 143-148. doi: 10.7668/hbnxb.20192433.

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