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油菜早春脱力会导致腋芽退化,造成有效分枝节位上升和分枝数减少,在栽培上要采取相应的预防措施。 1.增施肥料。油菜在缺氮的情况下,叶色变淡发红,特别是冬发型油菜,在旱春气温回升时,生长速度加快,如果氮素供应与油菜生长不协调,叶色落黄,就会出现脱力,影响春发。预防措施:在1月中下旬施1次肥料,春肥腊施。每667平方米用碳酸氢铵30～40 公斤开穴埋施,或用猪栏厩肥 1500公斤开沟条施,避免其早春脱力。如果腊肥没施用或施用不足,则要早施返青接力肥,力争在2月上旬施入,每667平方米追尿素8 公斤,促其春发稳长。
Rape early in spring will lead to axillary buds degeneration, resulting in an increase in the number of effective sub-node and the number of branches to reduce the cultivation should take appropriate precautions. 1. Increase fertilizers. Rape in the case of nitrogen deficiency, pale red color, especially winter-type rape, dry spring temperature rise, the growth rate accelerated, if the nitrogen supply and rape growth is not coordinated, leaf color yellow, there will be Detachment, affecting the spring. Preventive measures: 1 fertilizer in mid-late January, spring fat wax Shi. Each 667 square meters with 30 to 40 kg of ammonium bicarbonate hole burial, or 1500 kg pig barn manure ditching facilities, to avoid its early spring off. If not applied or insufficiently applied, waxing fertilizer should be applied back to the early successor fertilizer, and strive to be applied in early February, every 667 square meters to recover urea 8 kg, prompting its spring hair stable.