Magnesium, as a necessary intermediate element for plants, plays an important role in plant metabolism and growth. When the plant lacks magnesium, its prominent performance is a decrease in chlorophyll content and chlorosis. Due to the strong mobility of magnesium in the phloem, symptoms of magnesium deficiency are often first expressed on old leaves and gradually develop into new leaves. In the absence of magnesium, the plants are short and grow slowly. The magnesium deficiency of gemini plants is chlorotic between leaves and veins, and gradually changes from light green to yellow or white. Brown or purple spots or stripes of different sizes may also appear; in the case of severe magnesium deficiency, necrosis occurs in the entire leaf. When the gramineae lack magnesium, the chlorophyll accumulated in the base of the leaf appeared dark green spots, and the rest was pale yellow; when the magnesium was severely deficient, the leaves were faded and streaked, and necrotic spots appeared on the tip of the leaves.
The results of field experiments conducted by the researchers on 236 crops of 22 crops, including economic crops, oil crops, food crops, vegetable crops, and fruit, showed that the application of magnesium fertilizer in soil can increase crop yield and character. Please pay attention to the following points before use:
1. Consider the effective magnesium content of the soil. Magnesium fertilizer has a negative correlation between crop availability and soil available magnesium content. When the effective magnesium content of soil is less than 25 mg/kg, the increase in magnesium production for soybeans, peanuts, and tea is large, reaching 9.8% to 40.2%. When the available magnesium content of soil is less than 50 mg/kg, the magnesium fertilizer has various degrees of increase in production, with an increase of 2.7%~11.2%.
2. Think about the mutual effects of potassium and magnesium. The effect of magnesium application is limited by the potassium applied to the soil. After a large amount of potassium is applied to the soil, the amount of magnesium supplied by the soil is also insufficient. Potassium and magnesium in the soil have mutual restriction, and the appropriate ratio of potassium to magnesium is the basis for high yield and high efficiency. After repeated field experiments, the more suitable potassium and magnesium than sugar cane is 33, cassava 51, peanut, soybean 21, jute, sweet potato 24, watermelon 17.
3. Think about crop varieties and magnesium fertilizer requirements. The effect of magnesium fertilizer production is related to the magnesium demand of different crops and the sensitivity to magnesium levels. Flue-cured tobacco was sensitive to magnesium application, followed by rapeseed and soybeans, and wheat sensitivity was low.
4. To select the appropriate magnesium fertilizer varieties. Different types of magnesium fertilizer have different properties and there are differences in application effects. The application of chemical fertilizers such as magnesium carbonate and magnesium oxide on red soil was the best. The dry matter yield of crops increased by 76.1% and 87.3%; followed by magnesium sulfate and sepiolite, which increased by 31.0% and 22.5% respectively; and magnesium chloride had the worst effect.
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