Rapeseed deprivation in early spring is a phenomenon of premature aging. There are several characteristics in appearance: 1 The leaves are purple green, the new leaves are small and straight, and the leaves are thin, showing obvious symptoms of hypoxia. 2 The base of the stem is small and thin, the stem skin is shrinking, and the skin color is blue with purple. 3 The growth rate is obviously slow, mainly due to unpleasant leaves. According to the determination, rape enters the green period. Under normal circumstances, it takes 8 to 10 days for a new leaf to be born, and the rapeseed for power off takes about 15 days. The early spring decoction of rapeseed can cause the axillary buds to degenerate, resulting in the increase of effective branching nodes and the reduction of branch number, which has a great impact on the yield. Therefore, in the cultivation should carefully analyze the reasons for the early spring deterrence, and take appropriate measures. The specific method is as follows: Addition of fertilizer to rapeseed is a nitrogen-requiring crop. The temperature in early spring will rise and the growth rate will be faster. If there is a lack of fertilizer, spring fertilizer can be applied, ie, ammonium bicarbonate can be applied every 667 square meters in the middle and late January. ~40 kg, making it effective in the early spring. If you do not use spring fertilizers in the winter, you should apply green fertilizers early and try to apply them in early February. Cleaning the ditch is too high humidity is an important reason for the early spring off. Investigations revealed that the long-term wet fields had black roots, root hairs fell off, poor fertilizer absorption capacity, and growth was hindered, and the above-ground parts were atrophic. Draining the ditch and reducing the soil moisture can increase the vitality of the roots and make the above-ground parts grow robust. Prevention of locust spring locust harm can also make the leaf yellow, showing off symptoms. Can be mixed fertilizer spray method, with 667 square meters with 40% omethoate EC 75 mg, 150 grams of potassium dihydrogen phosphate, add water 50 kg spray.
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