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油菜生长,要求土层深厚,土质疏松,水分适宜的土壤环境,而土壤水分特别重要。铜仁地区属中亚热带的温热春雨夏旱区,秋宋初冬雨水偏少,土壤含水量偏低,不能满足油菜萌芽,成苗对土壤水分的要求。春末夏初雨水偏多,土壤含水量偏高,湿度增大,危害油菜的生长。旱、渍害的次递影响,是本区油菜单产不高的主要原因之一。
Rape growth, demanding deep soil, loose soil, water suitable soil environment, and soil moisture is particularly important. Tongren is a subtropical region in the warm spring rain in summer and drought in the early autumn and early Song Dynasty, less rainfall in winter, soil moisture content is too low, can not meet the rape germination, seedlings of soil moisture requirements. Spring late summer and early summer rainfall is too high, high soil moisture, humidity, harming the growth of rapeseed. Drought, pickles the second delivery, is one of the main reasons for the low yield of rapeseed area.