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一、需肥量及其配比 双低油菜耐氮肥的能力较差,与普通油菜相比,需氮量相应较少。一般667平方米施纯氮15公斤时,能获得较高产量。但是不同品种需氮量不同,中双2号等增产潜力大的品种,施纯氮量达20公斤时才能获得最高产量;双低油菜对磷肥反应敏感,当土壤速效磷含量小于每公斤5毫克时,容易出现缺磷症状。在施用一定量氮肥和钾肥的情况下,产量随施磷量的增加而极显著地增加。研究结果表明:双低油菜施用氮(N)、磷(P_2O_5)、钾(K_2O)肥比例以1:0.5～0.75:0.50～75为宜。中等肥力田,每667平方米产菜籽125公斤～150公斤时,需N15公斤～17公斤,P_2O_5和K_2O各7公斤～8公斤;产
First, the amount of fertilizer required and its lower double resistant rape nitrogen tolerance is poor, compared with ordinary rape, nitrogen demand less. General 667 square meters Shi Chun nitrogen 15 kg, can get higher yields. However, the nitrogen demand of different varieties was different. Zhongshang No.2 could yield the highest yield with 20 kg of pure nitrogen. The double-low rapeseed was sensitive to phosphate fertilizer. When available phosphorus content was less than 5 mg / kg When, prone to phosphorus deficiency symptoms. In the case of applying a certain amount of nitrogen and potassium fertilizer, the yield increased extremely significantly with the increase of phosphorus application. The results showed that the ratio of nitrogen (N), phosphorus (P_2O_5) and potassium (K_2O) fertilizers in double low rapeseed should be 1: 0.5 ~ 0.75: 0.50 ~ 75. Medium fertility fields, each of 667 square meters of rapeseed production 125 kg to 150 kg, N15 kg to 17 kg, P_2O_5 and K_2O each 7 kg to 8 kg;