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Yellow leaves are caused by insufficient nitrogen, and the leaves of the seedlings are even yellow-green or yellow. The acres can be poured with 10 kg of urea or 20 kg of ammonium bicarbonate or 1000 kg of human excrement.
When the red leaves cause the leaves of the vegetable seedlings to be reddish due to insufficient soil moisture, they should be irrigated and drought-resistant in time; if there is too much rain, the roots are dead, and the leaves are dark red, the water should be drained and drained; the temperature is below 0 °C, and the leaves are affected by the leaves. When frozen and reddened, it can be combined with cultivating and cultivating soil, and 8-10 kg of wood ash is applied to the acre; when the locust is caused to cause redness, the insect can be sprayed with 80% dichlorvos 1000 times.
Purple leaf When the soil is deficient in phosphorus, the rapeseed plants grow slowly, the leaf color lacks luster, the leaves have purple-red spots or plaques on the edges, and the petioles are purple. Mu can be applied to 20-25 kg of superphosphate, or sprayed 2-3 times with 400 times of potassium dihydrogen phosphate.
Brown leaves Due to the lack of potassium, the leaves have yellow spots at the beginning, and the edges of the tips gradually appear as "focal edges" and light brown spots, starting from the old leaves and then developing toward the heart leaves, gradually withering. The acre can be applied with 8-10 kg of potassium chloride or 100 kg of plant ash, or sprayed 2-3 times with 400 times of potassium dihydrogen phosphate.
Look at the leaf color to fertilize the rape
During the growth of rapeseed, the leaves may have different degrees of discoloration due to the lack of certain nutrients or adverse external factors. In production, according to the change of leaf color of rapeseed seedlings, corresponding management measures are taken.
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