Magnesium deficiency in citrus is a very common phenomenon, especially in the citrus groves in hilly mountains of China. Magnesium deficiency seriously affects the tree potential and flowering results. The leaves on the old leaves and the resulting shoots are most prominent. The magnesium-deficient plants tend to have fallen leaves and shoots after the end of autumn.
Magnesium deficiency leads to poor photosynthesis
Magnesium deficiency in citrus occurs from fruit enlargement to peel coloration. The more fruits that are hung, the more severe the magnesium deficiency. In the absence of magnesium, irregular yellow patches occur along the midribs of the leaves, and the yellow spots extend to the leaf margins on both sides, causing most of the leaves to yellow, and only the midrib and base leaf tissue are triangular green.
When the magnesium deficiency is serious, the leaves are all yellowed. The leaves and old leaves near the fruit first show symptoms. The diseased leaves are easy to fall, the branches of the leaves are weak, and they often die in the spring of the following year.
Magnesium-deficient plants have poor leaf gloss and weak photosynthesis, which is not conducive to the accumulation of photosynthetic dry matter, affecting fruit quality and sugar accumulation.
Five reasons are easy to cause citrus deficiency
The first is the low content of magnesium in the soil, or the loss of magnesium in acidic soil and sandy soil, which reduces the substitutional magnesium content in the soil.
The second is excessive application of potassium or phosphorus, which affects the absorption of magnesium.
The third is that the orchard uses chemical fertilizers for a long time without applying magnesium fertilizer, making the soil acidic, or excessive use of sulfur yellow pesticides, and is also prone to magnesium deficiency.
The fourth is that the general fruit multinuclear varieties are more likely to be deficient in magnesium than the less nuclear or non-nuclear varieties. For example, leaves such as Shatian pomelo, honey pomelo, and grapefruit are often prone to magnesium deficiency.
The fifth is that some rootstock varieties such as sweet orange with red lemon as a rootstock, banana mandarin is easy to express magnesium deficiency.
Three ways to solve the problem of magnesium deficiency
The first is the application of magnesium to the soil. Calcium, magnesium and phosphate fertilizers can be used for acidic soils, and calcium and magnesium fertilizers (including magnesium and lime) can be applied, 50-65 kg per mu, or 10-20 kg of magnesia. Magnesium sulfate is applied to the slightly acidic soil, or a multi-element micro-fertilizer such as carrageenan or a trace element in a polypeptide double enzyme. Magnesium fertilizer can be mixed and applied in organic fertilizer (fertilized manure).
The second is foliar application. In the early stage or lighter citrus tree, spray 0.4% magnesium nitrate solution, or 0.5%-1% magnesium sulfate and 0.2% urea mixed solution, spray once every 10-15 days, even spray 3-5 times; Or spray the magnesium-containing foliar fertilizer, spray 1-2 times before the shoot tip, can effectively relieve the symptoms, improve the leaf gloss, and is conducive to photosynthesis.
The third is to adjust the soil pH to increase the soil pH to 5.5-6.0, and adjust the soil pH before the spring shoots and before the autumn shoots. The use of lime, or imported calcium and magnesium fertilizer conditioning agents, combined with the use of slightly alkaline bio-organic fertilizers.
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