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油菜适时播种,是培育大壮苗越冬,夺取高产的基础。可用以下两种方法确定油菜的适宜播期。1.根据0℃以上积温推算。据介绍,油菜从播种至出苗,需0℃以上积温110℃,冬前每长一片功能叶,需0℃以上积温40～85℃。冬前,甘蓝型油菜若保持8～10片功能叶,需0℃以上积温
Rape timely sowing, is to cultivate big strong seedlings overwinter, to win the basis of high yield. The following two methods can be used to determine the appropriate sowing date. 1 according to the accumulated temperature above 0 ℃ projections. According to reports, rape from sowing to emergence, the need to accumulate temperature above 0 ℃ 110 ℃, winter long before every function leaf, the temperature above 0 ℃ 40 ~ 85 ℃. Before winter, if the rapeseed has eight to ten functional leaves, accumulate temperature above 0 ℃