1 citrus boron deficiency symptoms
Fresh water spots on the young leaves. The leaves are distorted. As the leaves grow, the yellow spots become yellowish-white translucent or transparent, the veins also turn yellow, and the main and lateral veins are swollen and corked and finally cracked.
The diseased leaves were shed early and new shoots were clustered out. When the diseased leaves were severe, the yellow leaves of the whole tree fell off and the shoots tipped.
On the old leaves, the main and lateral veins are also swollen, with corkification and dehiscence, and dark brown spots. The spots are dark brown in full leaves, dull, and the leaves are thick. The diseased leaves are curled to the back and become deformed.
Diseased tree young fruit skin milk white micro-protrusion small spots, severe dark spots appear subsidence, and cause a large number of fruit drop.
Residues on the tree are small, malformed, thick and hard skin, fruit surface with brown wood bolted knobs.
The inner fruit peel and the center column have a brown jelly, and the juice has less slag and is untenable. The seeds are not well developed, and they are small and curved. Fruit symptoms are most pronounced during spring drought
2. Causes of boron deficiency in citrus
The thin, red and yellow loamy soils in hilly and mountainous areas have low organic matter content, making boron insoluble and low in effective boron content; Boron deficiency.
Lime alkaline soil or excessive use of lime, boron is easily fixed by calcium and difficult to dissolve, can not be absorbed and used, easy to show deficiency of boron.
Nitrogen fertilizers are applied generally, and organic fertilizers are seldom applied, so that boron is not recharged and its absorption is affected; excessive application of nitrogen fertilizers will accelerate the growth of citrus, increase the demand for boron, and may easily cause supply imbalance; potassium fertilizers have been used More, affect the absorption and utilization of boron; are easy to induce boron deficiency.
In the rainy season and the citrus groves on the alluvial areas where rivers and rivers are often flooded, effective boron is easily lost. In dry season, the soil is dry, and it is difficult for the roots to absorb effective boron and is not conducive to the transport of boron in the plants. This is especially the case after the rainy season, followed by drought. Boron deficiency suddenly occurred.
3. The treatment of boron deficiency in citrus
Foliar fertilization Spray 0.1%-0.2% boric acid or borax at the beginning of spring.
Soil fertilization If the ground is loose, the soil is neutral or acid soil. It is also possible to spread 10-15 g of borax on the surface of each tree when sprouting in the spring. Pay attention to the number of sprays of boric acid or borax or the soil application can not be too much, otherwise it is easy to produce excessive boron, but produce boron poisoning, yellow spots on the leaves, resulting in fallen leaves.
4. Citrus Boron excess disease
Symptoms: After the yellow mottle appears at the tip of the tip of the old leaf, the mottle is enlarged from the tip of the leaf down the leaf margin. Brown resinous spots or mottles occur on the back of the leaves, forming irregular patches.
Control methods: irrigation water on the soil. Acidic soil can also be applied lime, but the soil pH should not exceed 6.5.
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