娄底市稻板田直播油菜适宜播种期及气象条件研究

利用2010 ～2011年娄底市开展的稻板田油菜分期播种试验资料和常规气象观测资料,通过线性相关分析法、模糊评判法对不同播期各主要生育阶段的油菜生物学特性及各生育阶段的气候适宜程度进行分析.结果表明:10月15日播种的油菜,营养生长期长,苗期气候适宜度值大,冬前苗长势好,产量高.此后,随着播种期的推迟,营养生长期相应缩短,气候适宜度值变低,冬前苗长势弱,产量低.因此,稻板田直播油菜在播种时间安排上应紧扣双季晚稻收割期,以10月中旬播种为宜.

Research on Suitable Sowing Time and Meteorological Conditions of Direct Seeding Rapeseed in Paddy Field in Loudi City

The biological characters and climatic suitability degree at different growth stages of rapeseed in interval sowing experiment in 2010～2011 were analyzed by linear correlation analysis method and fuzzy evaluation method.The results showed that: rapeseed sowed on October 15th showed longer vegetative growth period,bigger climate suitability value at seedling stage,better growth vigor of seedlings before winter and higher yield.With the delay of sowing time,the vegetative growth period shorten,climatic suitability value decreased,growth vigor of seedlings before winter weakened and yield decreased.Therefore,sowing date of direct seeding rape in paddy field should be arranged according to harvesting time of double cropping late rice,and the suitable sowing time was the middle of October.