Application of Foliar Potassium Fertilizer on Citrus

Potash is one of the three essential fertilizers for crops, and the role of potassium in citrus is very important. The main function is to promote the growth of crops, the thick stems, enhance the resistance of pests and lodgings, and promote the formation of sugar and starch. The main symptoms of potassium deficiency are: First, the demand for potassium in the citrus fruit expansion period increases. In the absence of potassium, the fruit becomes smaller, the acidity is high, the coloration is poor, and even the fruit is cracked. Second, the lack of potassium also caused the tree to weaken, the roots grew poorly, and the ability to resist drought decreased. The third is that citrus is deficient in potassium, not only is the yield low, but the quality is declining. How is potassium deficiency in citrus trees caused?

There are many reasons for the lack of potassium in orange trees, mainly in the following aspects.

First, citrus trees are generally planted on acidic soils. In the southern acid soils, the available potassium content is generally low, which is an external cause; while citrus trees are also potassium-producing fruit trees, and the large amount of potassium required is an internal cause.

Second, the amount of organic fertilizer applied is insufficient, and the source of potassium supplementation is also a cause.

The third is that the orange farmers have a habit of applying nitrogen fertilizer, which causes the fertilizer to be unbalanced, which affects the absorption of potassium by citrus trees.

The fourth is the lack of water and drought in the middle and late stages of mountain citrus orchards, which affects the absorption and utilization of potassium by roots.

The potassium supplementation measures that can be taken to prevent potassium deficiency in the late citrus trees include: when applying the base fertilizer in September, pay attention to the application of farmyard manure or cake fertilizer containing more potassium, and the adult citrus tree is about 2 kg per plant. At the same time, in the fruit expansion period and the late fruit, attention is paid to the foliar application of potassium fertilizer (at this time, the demand for potassium by citrus is large, and the root absorption is difficult to meet the needs of citrus for potassium fertilizer). It can be sprayed 2~3 times with Singapore imported potassium dihydrogen phosphate 500 times or British imported Hefeng potassium 1500 times, once every 7~10 days. After potassium supplementation in potassium-deficient citrus trees, the fruit is large and heavy, the content of soluble solids is increased, the content of vitamin C is increased, the acidity is decreased, the flavor is rich, the peel is hard, the coloration is deepened, the cracked fruit and wrinkled skin are reduced before harvesting, and the leaf and leaf tissues are enriched. The ability to resist drought is enhanced.

China Fertilizer Network

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