Do not let the grape lack nitrogen, phosphorus, potassium
When nitrogen deficiency grape lacks nitrogen, the leaves lose green and yellow, and the leaves are small, thin and easy to fall off. The old leaves begin to fade first and gradually develop towards the upper leaves. Remedy measures found that nitrogen deficiency, timely application of appropriate amount of nitrogen fertilizer in the root, can also be combined with root fertilizer, with 0.3% to 0.5% urea solution as a root spray fertilizer, and even spray 2 to 3 times. In the absence of phosphorus in P-deficient grapes, the leaves are small, the leaves are curled upwards, and the leaves are dark green. Sometimes the petioles and the back veins are purple or purple. From the old leaves, the leaf edges turn golden brown and then turn pale brown. The chlorotic leaves then became necrotic, withered and the leaves fell off early. Remedial measures should be promptly sprayed with 0.5% to 2% of superphosphate leaching solution or 0.2% to 0.3% of potassium dihydrogen phosphate solution. When potassium deficiency grape lacks potassium, leaf margins and leaf veins are chlorotic and yellow and develop into yellow-brown patches. In severe cases, the leaf margin is charred; the xylem of branches is underdeveloped, brittle and easily broken. Remedial measures found that potassium deficiency was promptly sprayed with 2% to 3% of ash leaching solution or 0.2% to 0.3% of potassium dihydrogen phosphate solution. Wenzhou Celecare Medical Instruments Co.,Ltd , https://www.celecaremed.com