In recent years, due to the large number of rural laborers migrating to cities and towns, the amount of farmed animals has decreased, and the source of organic fertilizers has been significantly reduced. Coupled with the fact that fruit prices have been sluggish for many years, fruit growers have drastically reduced or even eliminated the use of organic fertilizers, resulting in a continuous shortage of orchards in recent years. Increased trend. In particular, magnesium, which is the medium-sized element, has a large demand for fruit trees and insufficient supply of magnesium in the soil. The loss of magnesium from soils with heavy rainfall in the red and yellow soils in the south is serious, causing the symptoms of magnesium deficiency in orchards to become more and more serious. In the production of citrus magnesium deficiency correction, mainly rely on the application of magnesium fertilizer to solve, but in recent years, fruit growers generally reflect the effect of magnesium treatment is not obvious. According to the author's recent trials of different methods of applying magnesium fertilizer, the key to the treatment of magnesium deficiency in citrus lies in the application method.
The initial manifestation of citrus magnesium deficiency disease was the yellowing of the leaves of the plants. The green area at the base of the leaves showed an inverted “V†shape. As a result, the more plants were yellowed, the more serious, and the main veins and the lateral veins would be swollen and woody like boron deficiency. In the suppository, the entire leaf may become bronze, and the leaves fall off earlier, which seriously affects the yield and quality of the local citrus.
Magnesium deficiency correction in the southern red and yellow soil, the soil pH value is mostly 4.5 to 6, generally can be applied magnesium oxide, magnesium containing lime, calcium magnesium phosphate fertilizer and other magnesium-containing fertilizers to supplement the magnesium in the soil. These magnesium-containing fertilizers have a slower effect and should be applied as base fertilizers and decomposed pig manure and cake fertilizers. The mixed manure is applied near the canopy drip line and is mainly used for the prevention or mild disease onset of magnesium deficiency. The amount of mu is: 20-30 kg of magnesium oxide, 50-60 kg of magnesium-containing lime or calcium magnesium phosphate fertilizer.
For orchards with symptoms of magnesium deficiency, the effect of applying magnesium once a year is not obvious. The key lies in the use of quick-acting magnesium sulfate and magnesium nitrate fertilizers, which can be cured 3 to 4 times a year, and after two years of continuous application, the symptoms of yellowing are reduced and the effect is significant. Citrus fruit trees can be combined with winter basal fertilizer, flowering before or after flowering in March-March, fruit-keeping fertilizer in May, and promoting strong fruit fertilizer in July. The annual amount of soil used for the application of 50 ~ 60 kg, in order to increase the effect of correction, can be every 10 to 15 days after the start of spring shoots, once with 1% magnesium nitrate or magnesium sulfate solution, spray 3 to 5 times, Foliar fertilization. After the magnesium deficiency is relieved, organic fertilizers are applied every year, and slow-effect and quick-acting magnesium fertilizers are applied to ensure the uniform supply of magnesium, so that a more complete treatment can be obtained.
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