四川盆地丘陵地区油菜低产原因及高产栽培技术措施

An Investigation on the Causes for Low Yield of Rape (Brassica napus L)in the Hilly Area of Sichuan Basin and Agrotechnical Measures for Its Yield Improvement

资料分析和试验表明，四川盆地丘陵区油菜低产原因是：土壤结构差、湿度大、有效养分低；气温偏高、温差较小、降雨较多；油菜前期苗弱而达不到壮苗秋发及年后偏施氮肥。高产栽培技术措施是，稻田早开沟排水，增施有机干粪；稀播早栽促秋发；合理施肥，重前期追肥；即时防治病虫，重点防治菌核病。

he lingering low yield of oilseed rape in the hilly areas as compared to the adjacent Chengdu Plain was attributed to poor soil structure,high soil humidity and low available nutrient level;relatively high temperature,small diurnal variation in temperature and excessive rainfall;and poor seedlings growth at the early growing stages of the plants, which affected their vigour in autumn as well as unbalanced application of N at the bolting stageAgrotechnical measures for yield improvement were offered,which included early drainage of the field(with paddy rice as the preceeding crops),addition of dried manure,thin and early sowing to ensure vigorous growth of the crop in autumn,rational fertilizer application with emphasis placed on the early growing stages and timely pest control with emphasis placed on sclerotiniose