Citrus lack of "boron" to be treated early

Symptoms Boron deficiency causes the leaves and old leaves to begin yellowing from the veins, until the whole leaf is dull and yellow, dull, curled backwards, the leaves are thick, the main and lateral veins are tethered, the cracks are severe, and the leaves have Dark brown spots; boron deficiency associated with lack of manganese, petiole breaks. The tender shoots were watery and withered. The young leaves had irregular water-stained macules, distorted deformities, and some had black spots on the back of the main veins of the leaves, which were easy to fall off. The milky white micro-protrusions of small spots occur on the skin of young fruit, and when they are severe, dark spots appear to subside. The mesocarp and fruit heart are filled with colloid, often causing a large amount of young fruit to fall off. In the case of severe boron deficiency, a large number of leaves fall off early and the branches die, sometimes the whole plant dries up.

In the acid red soil, the leaching loss caused by high temperature and heavy rain caused widespread boron deficiency, and the loss of sandy soil was even more serious. Excessive application of nitrogen, phosphorus, calcium fertilizer, or too much calcium in the soil can easily lead to boron deficiency. Excessive heat and dry weather during the rainy season will reduce the ability of the roots to absorb boron, especially after the rainy season, followed by dry rain, often causing sudden lack of boron.

Prevention and application of boron fertilizer. The boron fertilizer was mixed into the excreta, and the ditch was applied under the canopy, covered with some organic fertilizer and then covered with soil. Avoid excessive application of nitrogen, phosphorus and calcium fertilizers. Especially in soils with low organic matter content, care should be taken not to use excessive nitrogen, phosphorus and calcium fertilizers. However, the appropriate application of calcium fertilizer, reducing the acidity of the soil is beneficial for citrus to absorb boron. Heap manure, or manure with high boron content and green manure should be applied. In general, spraying boron fertilizer once on the foliage of Qingyuan and Xiehua can effectively prevent and treat boron deficiency.

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