Look at leaf color to fertilize canola
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During the growth of rapeseed, different degrees of discoloration may occur in the leaves due to the lack of certain nutrient elements or adverse external factors. During production, appropriate management measures can be taken according to the changes in the leaf color of rape seedlings. The yellow leaves are caused by insufficient nitrogen and the leaves of the seedlings are uniformly yellowish green or yellow. Mu can be poured with 10 kg of urea or 20 kg of ammonium bicarbonate or 1000 kg of human waste. When the leaves of red leaves are reddish due to lack of soil moisture, they should be dredged and drought-fighted in time; when there is too much rain, the roots are stiff, and when the leaves are dark, they should be drained and drained; the temperature is below 0°C, and the leaves are affected. When it is red and red, it can be combined with cultivating soil, and 8 to 10 kg of plant ash can be applied. When the locust infestation causes redness of leaves, the insect can be treated with 80% dichlorvos 1000 times spray. In the absence of phosphorus in the purple leaf soil, the rapeseed plants grew slowly, the leaf color lacked luster, and there were purple-red spots or patches on the edges of the veins, and the petiole was purple. Mu can be applied to superphosphate 20-25 kg, or with potassium dihydrogen phosphate 400 times foliar spray 2-3 times. Due to lack of potassium, brown leaves have yellow spots in the early stages of the leaves, and the "focal edges" and pale brown spots appear gradually on the edges of the leaves. They start from the old leaves and develop toward the heart, and gradually wither. Acres can be topdressed with potassium chloride 8-10 kg or about 100 kg of plant ash, or with potassium dihydrogen phosphate 400 times foliar spray 2-3 times.