1 symptoms
The shoots are not normal, the branches and leaves are rare and small; the leaves are thin yellow, pale green to yellow, so that the leaves of the whole plant are uniformly yellow and fall off prematurely; the flowers are small, the skin is pale and smooth, often premature; when severe nitrogen deficiency occurs The shoots are dry, the tree vigor is declining, and the canopy is bare.
2. Causes of Nitrogen Deficiency in Citrus
The main causes of nitrogen deficiency in soil nitrogen deficiency citrus trees ;
Soil hydrocephalus Hypoxia, roots can not be normal activities, affecting nitrogen absorption, causing nitrogen deficiency;
Damaged roots and other diseases cause damage to the roots and affect nitrogen absorption.
The results showed that the results of the year tree were too much, nitrogen was consumed, and the tree nutrients were insufficiently stored.
The application of unrefined organic fertilizer resulted in root damage and affected nitrogen absorption;
The effect of high phosphorus content is high in soil phosphorus, and the demand of citrus for nitrogen fertilizer is increased. If nitrogen deficiency in high-phosphorus soil is insufficient, nitrogen deficiency is likely to occur.
3. The treatment of citrus nitrogen deficiency
The soil management is based on the laws of the tree requiring fertilization and rational fertilization, strengthening soil management, fertilizing the soil and preventing soil erosion;
Nitrogen is applied at the peak of nitrogen requirement for soil fertilization (flowering, new shoots germination and fruit expansion), and 1 kg of pure nitrogen can be applied per 100 kg of fruit, and the fertilization technique can be reduced to 05-0.8 kg (in mature trees).
Foliar fertilization young fruit and shoot growth stage, 0.3%-0.5% urea, potassium nitrate or soluble compound fertilizer, once every 7-10 days, continuous 2-3 times;
Others, such as soil water, citrus root decay, trunk damage and other causes of nitrogen deficiency, you need to take trenching drainage, relying on new rootstock and other measures.
4. Citrus nitrogen excess disease
Symptoms: luxuriant foliage, dark green leaves, long shoots, and only fruitless growth or fruit loss;
Large leaves, fruit acidity, coloring delay; intolerance storage; serious, can lead to potassium deficiency and calcium deficiency.
Orthodontic treatment: Reduce the application of nitrogen fertilizer when applying base fertilizer.
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