Nitrogen deficiency: The leaves are obviously yellow and thin, the heart leaves are yellow-green, the old leaves are red-yellow, the plants are dwarf, the growth is weak, and the roots are red and old. Supplementary nitrogen fertilizer is the main method. Generally, 1,000 kg of human fecal material can be used per acre or 20 kg of ammonium bicarbonate can be added to water. Phosphorus deficient: long slow, the leaves become smaller, leaf thickening, dark green or green, no dark, purple veins appear at the edge of the veins, the whole rape to normal about 2 less. Remedial measures to increase the application of phosphate fertilizer, per acre available superphosphate 15 kg -20 kg, after soaking the leachate poured to improve absorption and utilization, can also be used 10% potassium dihydrogen phosphate spray, generally Can spray 2 times -3 times, 7 days apart. Potassium deficiency: generally begins with the yellow leaves from the lower part of the old leaves, and gradually develops yellow spots in the upper part of the heart and leaves, and then the cobs and light brown spots appear at the tips of the leaves. The entire leaf is thickened and hardened, and the yellow and potassium-deficient rapeseeds are yellow. Per acre can be used potassium chloride or potassium sulfate 10 kilograms of water 700 kg -800 kilograms of pouring facilities, but also can use 100 kilograms of plant ash to withdraw.
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Rapeseed nitrogen and phosphorus potassium how to do?