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冬季和早春气温低、变幅大.油菜在生长过程中,由于缺少营养元素或遇到不良气候的影响,致使油菜叶片出现不同程度的黄、红、褐、紫色等现象。因此,要观察其叶色的变化,针对不同叶色,采取冬春管理措施,促进油菜健壮生长。(一)黄色叶:因氮素不足,油菜叶片呈黄绿色或黄色。每亩可用尿素7—8公斤,或碳铵15—20公斤,或人粪尿15—20担,加水15—20担浇施。(二)红色叶:土壤含水
In winter and early spring, the temperature is low and the amplitude is large.During the growth of rapeseed, due to the lack of nutrients or the impact of bad climate, rape leaves appear yellow, red, brown and purple in different degrees. Therefore, to observe the changes of its leaf color, for different leaf color, take winter and spring management measures to promote the robust growth of rape. (A) yellow leaves: due to lack of nitrogen, rape leaves were yellow-green or yellow. Available urea per acre 7-8 kg, or ammonium bicarbonate 15-20 kg, or 15-20 Tam human waste, add water 15-20 drench facilities. (B) red leaves: soil moisture