Vegetables are economically more profitable crops. Therefore, many farmers often apply excessive amounts of organic fertilizers and chemical fertilizers in order to obtain higher yields, resulting in excessive accumulation of soil nutrients and physiological barriers to vegetables. The physiological diseases commonly found in greenhouses and greenhouses are as follows:
First, cucumber. 1. Yellowing between veins. The reason is that excessive application of phosphate fertilizer causes zinc deficiency. 2. Yellow and white between the veins. The reason is that excessive potassium application causes magnesium deficiency. 3. The leaves are yellow and white, and the leaf margins are still green. The reason is that excessive phosphorus application causes magnesium deficiency. 4. The leaves are browned along the veins. The reason is that excessive phosphate application causes potassium deficiency.
Second, tomatoes. 1. Strips and grooves appear on the surface of the stem, and even cracks and hollows in the stem appear. The reason is that excessive nitrogen application causes calcium and boron deficiency. 2. Necrotic, blackened, and rotted parts of the flower falling parts. The reason is that high temperature, dry and excessive application of nitrogen or potassium fertilizer affects the absorption of calcium. 3. The fruit around the bracts is green. The reason is that there is too much nitrogen fertilizer and the climate is dry, causing potassium deficiency. 4. Poor coloration, with brownish brown fruit. This is caused by the accumulation of various nutrient segregants and poor drainage.
Third, eggplant. 1. The sepals are longitudinally split and corked. The reason is that too much nitrogen is applied, which affects the absorption of calcium. 2. The top of the fruit (the part where the flower is falling) is sunken and hardened. This is due to excessive nitrogen application and affects water absorption. 3. The lower leaves or side shoots have brown spots. The reason is that poor drainage causes excess manganese.
Fourth, pepper. The top of the fruit (the falling part) becomes black and soft. The reason is that excessive application of nitrogen or potassium fertilizer and high temperature drying cause calcium deficiency.
Five, cabbage. 1. The inside of the ball is brown and rot. The reason is that excessive nitrogen fertilizer causes calcium deficiency. 2. In the early and middle stages of the ball, the leaf edge turns brown and rots. The reason is that excessive nitrogen application causes calcium deficiency.
Six, cabbage. 1. The heart of the cabbage is brown and rotten. The reason is that excessive application of nitrogen fertilizer causes calcium deficiency. 2. In the early and middle stages of the core, the leaf margins become brown and rot. The reason is that the application of nitrogen fertilizer is too high and the high temperature and dryness cause calcium deficiency. 3. Black scattered small spots appear on the epidermis of the main vein of the core. The reason is that there is insufficient sunshine and excessive application of nitrogen fertilizer causes poisoning. 4. The main veins and petioles of the stalks of the stalks are scorpion-like. The reason is too much calcium and the pH of the soil is too high.
Seven, Artemisia. The growth point became brown and necrotic, and the plant height stopped growing. The reason is that excess phosphate is dry and causes calcium deficiency. Eight, celery. The heart of the plant browned and rotted. The reason is that calcium or potassium overdose causes calcium deficiency. Nine, spinach. 1. At the beginning of the true leaves, the leaves are dark green, gradually brown, and fertility is inhibited. Due to excess phosphorus. 2. Yellowing or yellowing between veins. The reason is that the high pH of the soil causes manganese deficiency, especially after rain. 3. Yellow leaf edge of new leaves. The reason is that excess manganese causes ferrite deficiency.
Ten, radish. 1. The leaf margins of the central leaves appear dark purple, and the veins gradually become brown. The reason is that soil high phosphorus causes other nutrient imbalances. 2. The center of the root is dark brown and gradually turns pale yellow. This is due to the high pH of the soil and the lack of boron caused by excessive calcium.
Eleven, watermelon. 1. The leaves with the center of the fruit section are dark spots. The reason is that excessive application of potassium fertilizer causes magnesium deficiency. 2. The vines and leaves are long, and the upper part of the vine becomes thicker and harder to firm. This is due to excessive nitrogen application.
First, cucumber. 1. Yellowing between veins. The reason is that excessive application of phosphate fertilizer causes zinc deficiency. 2. Yellow and white between the veins. The reason is that excessive potassium application causes magnesium deficiency. 3. The leaves are yellow and white, and the leaf margins are still green. The reason is that excessive phosphorus application causes magnesium deficiency. 4. The leaves are browned along the veins. The reason is that excessive phosphate application causes potassium deficiency.
Second, tomatoes. 1. Strips and grooves appear on the surface of the stem, and even cracks and hollows in the stem appear. The reason is that excessive nitrogen application causes calcium and boron deficiency. 2. Necrotic, blackened, and rotted parts of the flower falling parts. The reason is that high temperature, dry and excessive application of nitrogen or potassium fertilizer affects the absorption of calcium. 3. The fruit around the bracts is green. The reason is that there is too much nitrogen fertilizer and the climate is dry, causing potassium deficiency. 4. Poor coloration, with brownish brown fruit. This is caused by the accumulation of various nutrient segregants and poor drainage.
Third, eggplant. 1. The sepals are longitudinally split and corked. The reason is that too much nitrogen is applied, which affects the absorption of calcium. 2. The top of the fruit (the part where the flower is falling) is sunken and hardened. This is due to excessive nitrogen application and affects water absorption. 3. The lower leaves or side shoots have brown spots. The reason is that poor drainage causes excess manganese.
Fourth, pepper. The top of the fruit (the falling part) becomes black and soft. The reason is that excessive application of nitrogen or potassium fertilizer and high temperature drying cause calcium deficiency.
Five, cabbage. 1. The inside of the ball is brown and rot. The reason is that excessive nitrogen fertilizer causes calcium deficiency. 2. In the early and middle stages of the ball, the leaf edge turns brown and rots. The reason is that excessive nitrogen application causes calcium deficiency.
Six, cabbage. 1. The heart of the cabbage is brown and rotten. The reason is that excessive application of nitrogen fertilizer causes calcium deficiency. 2. In the early and middle stages of the core, the leaf margins become brown and rot. The reason is that the application of nitrogen fertilizer is too high and the high temperature and dryness cause calcium deficiency. 3. Black scattered small spots appear on the epidermis of the main vein of the core. The reason is that there is insufficient sunshine and excessive application of nitrogen fertilizer causes poisoning. 4. The main veins and petioles of the stalks of the stalks are scorpion-like. The reason is too much calcium and the pH of the soil is too high.
Seven, Artemisia. The growth point became brown and necrotic, and the plant height stopped growing. The reason is that excess phosphate is dry and causes calcium deficiency. Eight, celery. The heart of the plant browned and rotted. The reason is that calcium or potassium overdose causes calcium deficiency. Nine, spinach. 1. At the beginning of the true leaves, the leaves are dark green, gradually brown, and fertility is inhibited. Due to excess phosphorus. 2. Yellowing or yellowing between veins. The reason is that the high pH of the soil causes manganese deficiency, especially after rain. 3. Yellow leaf edge of new leaves. The reason is that excess manganese causes ferrite deficiency.
Ten, radish. 1. The leaf margins of the central leaves appear dark purple, and the veins gradually become brown. The reason is that soil high phosphorus causes other nutrient imbalances. 2. The center of the root is dark brown and gradually turns pale yellow. This is due to the high pH of the soil and the lack of boron caused by excessive calcium.
Eleven, watermelon. 1. The leaves with the center of the fruit section are dark spots. The reason is that excessive application of potassium fertilizer causes magnesium deficiency. 2. The vines and leaves are long, and the upper part of the vine becomes thicker and harder to firm. This is due to excessive nitrogen application.
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