Excessive Fertilization of Vegetables Causes Physiological Diseases
Vegetables are more economically beneficial crops. Therefore, in order to obtain higher yields, many farmers often apply organic fertilizers and chemical fertilizers excessively, causing excessive accumulation of soil nutrients and causing physiological obstacles to vegetables. The common physiological disease manifestations of cultivated vegetables in greenhouses and greenhouses are described as follows:
One, cucumber yellow veins. The reason is that excessive application of phosphate fertilizer causes zinc deficiency; yellowing and whitening between veins. The reason is that excessive application of potassium fertilizer causes magnesium deficiency; yellowing and whitening between veins, the leaf margin is still green. The reason is that excessive application of phosphate fertilizer causes magnesium deficiency; the leaves are browned along the veins. The reason is that excessive application of phosphate fertilizer causes potassium deficiency.
Second, the appearance of stripe grooves on the surface of tomato stems, even cracks, hollow stems. The reason is that excessive nitrogen fertilizer causes the deficiency of calcium and boron, and the falling part of the fruit appears necrotic, dark, and rotten. The reason is that high temperature, dry and excessive application of nitrogen fertilizer or potassium fertilizer, affect the absorption of calcium; the fruit surface around the sepal is green. The reason is the excessive application of nitrogenous fertilizer and dry climate caused by the lack of potassium; poor coloring, fruit surface with dark brown. This is caused by agglomeration of various nutrients and poor drainage.
Third, eggplant sepal longitudinal cracking, corkation. The reason is that excessive nitrogen fertilizer affects the absorption of calcium; the top of the fruit (falling flower parts) is hollowed and hardened. This is due to excessive nitrogen application, which affects the absorption of water; brown spots are found in the lower leaves or lateral branches. The reason is excessive manganese caused by poor drainage.
Fourth, the cabbage ball is browned and rotted inside. The reason is that calcium deficiency is caused by excessive nitrogen fertilizer; the initial, mid-leaf fronds become brown and decay. The reason is that excessive nitrogen fertilizer causes calcium deficiency.
Fifth, cabbage parts of the heart turn brown and rot. The reason is that excessive application of nitrogen fertilizer causes a lack of calcium; the middle and middle margins of the core are brown and decay. The reason is that the application of nitrogen fertilizer is too high and the calcium deficiency is caused by high temperature and dryness; black scattered small spots appear on the epidermis of the main vein of the core-covered leaves. The reason is that the lack of sunlight, nitrogen fertilizer caused by excessive poisoning of NO3; wrapped core veins, petiole appear ecdysis. The reason is excessive calcium and high soil pH.
6. The leaves of early leaves of spinach develop dark green, gradually turning brown, and their fertility is inhibited. Caused by excessive excess phosphorus; vein yellowing or yellowing. The reason is that the high soil pH causes a lack of manganese, especially after the rain; yellowing of the new leaf margin occurs. The reason is that excess manganese causes ferritin deficiency.
Seventh, the leaves of the middle radish appear black purple, gradually turning brown between veins. The reason is that the soil's high phosphorus causes imbalance of other nutrients; the center of the root is dark brown and gradually turns pale yellow. This is due to the high soil pH and excess calcium causing boron deficiency.
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