Effects of Nitrogen Applied Rates on Yield, Dry Matter Accumulation and Nitrogen Absorption and Utilization in Semi-dwarf Oilseed Rape

doi:10.7668/hbnxb.20191557

Abstract

Abstract: In order to explore the characteristics of dry matter and nitrogen accumulation and find out the appropriate nitrogen application amount for high yield and high efficiency in semi-dwarf oilseed rape, the semi-dwarf rapeseed Jiayou JS-1 was used as the material to study the nitrogen application rate(0-360 kg/ha)on semi-dwarf rapeseed yield,plant dry matter accumulation and nitrogen absorption and utilization. The results indicated that plant height,nitrogen application had significant effects on seed yield,nitrogen accumulation and nitrogen utilization rate of semi-dwarf rapeseed. The grain yield,plant nitrogen accumulation and agronomic nitrogen utilization of semi dwarf rape all increased first and then decreased with the increase of nitrogen application(90-360 kg/ha),reaching the maximum value when the nitrogen application was 270 kg/ha,while the partial nitrogen production decreased with the increase of nitrogen application. Under different nitrogen application levels,the start time and end time of rapid dry matter accumulation in semi dwarf rape were later than that of rapid nitrogen accumulation. Under the reasonable nitrogen application(180-270 kg/ha),the maximum rate of dry matter accumulation in semi-dwarf rape had been delayed,and the termination time for the rapid accumulation of dry matter and nitrogen had been delayed and prolonged. Under the rice-rapeseed rotation system in Sichuan basin,the reasonable nitrogen application amount of direct-seeding semi-dwarf rapeseed was 180-270 kg/ha,which coud achieve high yield and high use efficiency of nitrogen fertilizer.

Key words: Semi-dwarf rapeseed, Yield, Dry matter accumulation, Nitrogen absorption, Nitrogen fertilizer use efficiency

CLC Number:

S143.1

YAN Hongmei, TANG Weiqun, LI Hongqiao, XIE Luyao, PENG Xiao, HU Yue, GUO Shixing, WU Yongcheng. Effects of Nitrogen Applied Rates on Yield, Dry Matter Accumulation and Nitrogen Absorption and Utilization in Semi-dwarf Oilseed Rape[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2020, 35(S1): 250-255. doi: 10.7668/hbnxb.20191557.

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