高寒区种植胡麻的氮肥施用量

Nitrogenous Fertilier Rational Applying on Linseed Planted in Severe Cold Mountain Region

在高寒山区瘠薄土壤上种植胡麻，每亩施入４ｋｇ以下纯氮时，产量随施氮量增加而提高；每亩施入４ｋｇ以上６ｋｇ以下纯氮时，氮肥的经济效益逐渐降低；每亩施入６ｋｇ以上９．２ｋｇ以下时，胡麻产量达到最高；每亩投施９．２ｋｇ以上时，产量开始降低。因此，在瘠薄土壤上种植胡麻合理施氮量为每亩４～９．２ｋｇ纯氮，最适施氮量为每亩８．８ｋｇ纯氮。

The products of linseed planted in poor soil of severe cold mountain region increased with the increase of application amount of nitrogen, when less than 4kg of pure nitrogen per mu was applied. The economic effect of nitrogen fertiizer decreased gradually with the application of 4-6kg of pure nitrogen per mu. The products of linseed was the highest with 6-9. 2kg of nitrogen appication and began to decrease with over 9. 2kg. The result showed that the rational nitrogen appling amount is 4-9.2kg of pure nitrogen per mu; the best is 8. 8kg.