(1) The main role of magnesium fertilizer
Magnesium is mainly present in chlorophyll, phytochemicals and pectin, and plays an important role in photosynthesis. Magnesium ion is an activator of various enzymes, which promotes the conversion and metabolism of sugars in the body and promotes the synthesis of fats and proteins. Magnesium can increase the oil content of oil crops, and magnesium can also promote the absorption of silicon by crops. Magnesium-deficient soil can increase the oil content of magnesium fertilizer, and magnesium can also promote the absorption of silicon by crops. Magnesium-deficient soil Mg fertilizer can increase the effect of phosphate fertilizer.
(2) Application Technology of Magnesium Fertilizer
1 Soil, crops and magnesium fertilizer application. The content of magnesium in the soil is mainly affected by the parent material and the weathering conditions. It is located in a high-temperature and rainy area and has a low total magnesium content. When the content of soil exchangeable magnesium (Mg2+) is lower than 50 mg/kg, the effect of applying magnesium fertilizer on the yield is significant. Potassium-rich soils and areas where potassium is applied for a long time, and lime soils in acid soils are all liable to induce physiological magnesium deficiency in soils. Cotton, fruit trees, and other economic crops are more sensitive to magnesium fertilizers, and the demand is larger. The demand for magnesium for rice is lower than that for sugar cane, potato, corn, citrus, etc. When the exchangeable magnesium in rice fields is 26-49 mg/kg, magnesium fertilizer The increase in production is not stable.
2 Mg fertilizer varieties and application. Magnesium is commonly used as magnesium magnesium phosphate fertilizer 8% to 20%, magnesium sulfate 10%, about 25% magnesium chloride, dolomite powder 11% to 13%. Acid soil is preferably made of calcium magnesium phosphate fertilizer and dolomite powder, and alkaline soil is preferably magnesium chloride or magnesium sulfate. It can be used as basal fertilizer or top dressing, calculated as Mg, with 1~1.5kg per acre. Citrus and other fruit trees, applied 0.5kg of magnesium sulfate per plant. Magnesium sulfate is a water-soluble magnesium fertilizer, can be used as extra-root fertilizer, spray concentration of 1% to 2%, 50 kg of spray solution.
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