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(2) The cause of the occurrence of phosphorus deficiency in the soil itself; in acidic soil, phosphorus is easily fixed by iron, aluminum and zinc; in alkaline soil, phosphorus is easily fixed by calcium; partial application of nitrogen fertilizer is not conducive to the absorption of phosphorus; Both are the main factors causing the lack of phosphorus in nectarines. In addition, nectarines are prone to phosphorus deficiency due to low-lying terrain, poor drainage, and low soil temperatures.
(3) Prevention and Control Method 1 In the autumn period, the base fertilizer should be applied with organic fertilizers, as well as phosphorus-containing fertilizers such as diammonium phosphate and superphosphate.
2 The compound fertilizer should be applied after the temperature rise in the greenhouse, before the mulching film, and before flower bud differentiation.
3 During the growing season, apply 300-500 times more potassium dihydrogen phosphate solution or 100-200 times calcium superphosphate clarifying solution.
Performance and Prevention of Phosphorus Deficiency in Nectarine
(1) Main Symptoms Phosphorus deficiency in nectarine, first of all, occurs in the middle and lower leaves of new shoots, and then gradually spreads throughout the branches until the symptoms are expressed in the whole tree. In the early stage of disease, the leaves were dark green, the petioles became red, the veins in the leaves of the leaves turned purple, and the leaves in the later stage were copper-colored. The old leaves at the base of the branches sometimes appear yellow-green and white spots, and even the whole leaves turn yellow, often falling off early; the young leaves at the top of the branches sometimes grow upright, narrow and roll down, showing tongue-like leaves. The shoots are weak and have fewer branches and are purple. The fruit is small and light, premature.