Magnesium, as a necessary medium element for plants, plays an important role in plant metabolism and growth. When plants are deficient in magnesium, their outstanding performance is a decrease in chlorophyll content and chlorosis. Due to the strong mobility of magnesium in the phloem, the symptoms of magnesium deficiency are often first manifested on the old leaves and gradually develop into new leaves. In the absence of magnesium, the plants are short and grow slowly. When the Gemini plants are deficient in magnesium, the veins are chlorotic and gradually change from light green to yellow or white. There are also brown or purple-red spots or streaks of different sizes. When magnesium is severely deficient, the whole leaves appear necrotic. When the gramineous plants were deficient in magnesium, the chlorophyll accumulation in the base of the leaves showed dark green spots, and the rest was pale yellow. When the magnesium was severely deficient, the leaves faded and streaked, especially the necrotic spots appeared at the tip of the leaves.
The field experiment results of 236 crops of 22 crops, including cash crops, oil crops, food crops, vegetable crops and fruits, showed that the application of magnesium fertilizer can improve crop yield and character. Please pay attention to the following points before use:
1. Think about the effective magnesium content of the soil. Magnesium fertilizer was negatively correlated with crop availability and soil available magnesium. When the effective magnesium content of the soil is less than 25 mg/kg, the yield of magnesium on soybeans, peanuts and tea leaves is large, ranging from 9.8% to 40.2%. When the effective magnesium in the soil is less than 50 mg/kg, the application of magnesium fertilizer has different degrees of stimulation, with an increase of 2.7%~11.2%.
2. Think about the mutual effect of potassium and magnesium. The effect of applying magnesium is restricted by the application of potassium in the soil. After the application of potassium in a large amount of soil, the amount of magnesium in the soil is insufficient, and the potassium and magnesium in the soil have mutual restraining effects. The suitable ratio of potassium to magnesium is the basis for high yield and high efficiency. After repeated field experiments, the suitable potassium and magnesium ratio is 33, cassava 51, peanut, soybean 21, jute, sweet potato 24, and watermelon 17.
3. Think about crop varieties and magnesium fertilizer needs. The yield-increasing effect of magnesium fertilizer is related to the magnesium requirement of different crops and the sensitivity to magnesium. Flue-cured tobacco is sensitive to magnesium, followed by rapeseed and soybean, and the sensitivity of wheat is low.
4. To choose the appropriate magnesium fertilizer variety. Different magnesium fertilizer varieties have different properties and different 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 powder, which increased yield by 31.0% and 22.5% respectively; magnesium chloride was the worst.
Website: The role of magnesium fertilizer in agricultural production
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