长江流域直播油菜密植效应及其机理研究进展

doi:10.3864/j.issn.0578-1752.2018.24.004

Abstract

Abstract:

The Yangtze River Basin is the main producing area of rapeseed in China, where the rapeseed area and total output accounts for about 90% of those of China. Compared with the developed country, directly-sown rapeseed in the Yangtze River Basin of China had lower density, lower yield, and lower mechanical rate but a higher fertilizer rate and higher labour costs. The high production costs, low economic performance resulted in farmers’ negative attitude toward planting rapeseed, which hindered the development of rapeseed production in this area. In recent years, the production practice all over the place showed that higher plant density was an effective measure to promote plant benefit and narrow the yield gap with the developed country. Based on relevant studies, this article summarized the effects and mechanism of higher plant density on rapeseed yield, seed quality, the resistance of stem lodging and pod shattering, nitrogen and light use efficiency, stem rot caused by Sclerotinia sclerotiorum, and weed occurrence. Based on this summary, the cultivation techniques that “the higher density can increase yield, compensate for late planting, adequately control weeds, lower nitrogen requirement, increase lodging resistance and facilitate mechanized harvesting” were brought forward, which could provide theoretical basis on establishing rapeseed population with high yield and high lodging resistance, and technical support for simple and efficient production of rapeseed in the Yangtze River Basin of China.

Key words: Yangtze River Basin, rapeseed, plant density, effects, mechanism

KUAI Jie,WANG JiJun,ZUO QingSong,CHEN HongLin,GAO JianQin,WANG Bo,ZHOU GuangSheng,FU TingDong. Effects and Mechanism of Higher Plant Density on Directly-Sown Rapeseed in the Yangtze River Basin of China[J].Scientia Agricultura Sinica, 2018, 51(24): 4625-4632.

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Effects and Mechanism of Higher Plant Density on Directly-Sown Rapeseed in the Yangtze River Basin of China

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