Reasonable application of magnesium to make tomatoes more beautiful
Lycopene, which is rich in tomato fruit, has a unique antioxidant effect, which can remove excessively accumulated free radicals in the human body and delay aging. Tomato fruit is also rich in carotene, vitamin C and B vitamins, which can significantly reduce cholesterol. Magnesium can promote the synthesis of vitamin A and vitamin C in tomato, so it plays an important role in improving the quality of tomato and playing a role in health care.
New leaves have a high demand for magnesium. Symptoms of magnesium deficiency first appear on older leaves because magnesium is easily mobile in the plant body. During the fruit enlargement stage, the leaves near the fruit first appear magnesium deficiency symptoms. When there is a slight magnesium deficiency, the stems and leaves of the plant can grow normally, and only show chlorosis between the veins of the old leaves, that is, the middle mesophyll begins to yellow, and the veins remain green; later, it slowly expands to the entire leaf, and sometimes the leaf margin is still green. In severe cases, the leaves of the old leaves are stiff or the edges are curled, the tissue between the veins is gradually necrotic or brown patches are formed between the veins, and eventually the leaves dry up or the whole plant turns yellow and dies. Magnesium-deficient tomatoes start from the second ear, fruit set and fruit enlargement are affected, and yield decreases.
Although the magnesium content in the soil is high, the available available magnesium content is less, and the utilization efficiency will be affected by various factors such as rainfall leaching, soil acidification, and ion antagonism. Tomatoes are prone to magnesium deficiency symptoms in the following situations:
1. The absorption of magnesium ions by the root system cannot meet the needs of the plant;
2. The available magnesium content in the soil is lower than the critical value;
3. In acidic soil with too much potassium application or alkaline soil with more calcium, the accumulation of potassium ions and calcium ions and other basic ions will affect the absorption of magnesium by tomato roots.
Tomato plants have a long growth cycle, high yield, and a large amount of fertilizer. It is generally believed that every 1000kg of tomato requires 0.43kg to 0.90kg of magnesium (MgO). Tomatoes require large amounts of magnesium throughout the growing season, and monthly application is recommended during the growing season. You can use organic fertilizers and slow-release magnesium-controlled fertilizers to add magnesium fertilizers. It is recommended to apply 10kg~20kg of potassium sulfate, calcium and magnesium per mu. You can also use 1%~3% magnesium sulfate or 1% magnesium sulfate or 1% magnesium sulfate during the tomato growth period or when the plants are found to be deficient in magnesium. % magnesium nitrate solution foliar spray.
