Citrus fertilization should prevent chlorine damage

In recent years, orange production caused by irrational application of chlorinated fertilizers and pesticides has caused the phenomenon of chlorine harm, which has attracted the attention of citrus farmers. In particular, after harvesting, some orange farmers applied compound fertilizers containing high levels of chlorine to increase the content of chloride ions in the soil. After the orange trees were absorbed, the water absorption decreased and the root tip died. The toxicity of chloride ions to citrus can be divided into two types, acute and chronic poisoning.

The duration of acute poisoning is short-lived and manifested as the old leaves become delustered and the citrus fruit falls off, causing serious loss of the orange orchard. This type occurs mostly in chlorine-containing pesticides that use potassium chloride to control citrus aphids. Chronic poisoning takes a long time. In the victim's citrus tree, it was found that the midrib of the leaves had brownish necrotic areas with narrower upper ends and narrower bases. The young shoots showed irregularly shaped intermittent brown spots with gray leaves and dark green veins. In winter, it is easy to fall leaves. After stopping the use of chlorine-containing potassium chloride and chlorine-containing pesticides, their symptoms can be alleviated.

So, how can we reduce the harm of chloride ions to citrus?

1 increase nitrogen fertilizer, with little or no potassium fertilizer. Generally, 50 kilograms of orange trees can be applied with about 0.3 kg of urea, plus 40-50 kg of decomposed human waste water. When applying compound fertilizer, it is necessary to use varieties with high nitrogen content and low potassium chloride content. . The compound fertilizers before the month were urea-sodium superphosphate-potassium chloride series compound fertilizers, and some of them were added with ferric chloride. Therefore, they contain high amounts of chloride ions, which can easily poison the orange trees.

2 Potassium nitride should not be used for rhizosphere fertilization, and it should not be used as foliar fertilization. When applied in the rhizosphere, potassium nitrate, potassium sulfate, or potassium dihydrogen phosphate is the best choice; when used as foliar fertilizer, urea, superphosphate, potassium dihydrogen phosphate (or potassium nitrate) can be added to the tank, and then poured into the tank. 5-7 days after the system to take the filtrate, diluted with water for foliar spray, after spraying the leaf can turn green, thick leaves, strong fruit effect is good, after the autumn shoots significantly reduced, deciduous Less, the quality and quantity of flowers in the following year are significantly increased, and can effectively prevent the chloride ions from poisoning citrus fruits.

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