Vegetables are economically more profitable crops. Therefore, many farmers often use excessive amounts of organic fertilizers and fertilizers in order to obtain higher yields, resulting in excessive accumulation of soil nutrients, causing physiological barriers to vegetables, especially in greenhouses and greenhouses. The performance of the disease is introduced as follows, so that the majority of vegetable farmers can achieve scientific fertilization.
1. Cucumber
1. Yellow veins between veins. Excessive application of phosphate fertilizer causes zinc deficiency.
2. Yellow and white between the veins. Excessive application of potassium fertilizer causes magnesium deficiency.
3. The yellow veins between the veins are still green. Excessive application of phosphate fertilizer causes magnesium deficiency.
4. The leaves are browned along the veins. The reason is that excessive phosphate application causes potassium deficiency.
Second, the tomato
1. Strip-like grooves appear on the surface of the stem, and even cracks appear, and the stem is hollow. Excessive application of nitrogen fertilizer causes a deficiency of calcium and boron.
2. The flowering part of the fruit is necrotic, blackened and rotted. Calcium absorption is affected by high temperature, dryness and excessive application of nitrogen or potassium fertilizer.
3. The fruit around the bracts is green. Excessive nitrogen application and dry climate cause potassium deficiency.
4. Poor coloration, with brownish brown fruit. Due to the accumulation of various nutrient segregants and poor drainage.
Third, eggplant
1. The sepals are longitudinally split and the corks are corked. Excessive nitrogen fertilizer affects calcium absorption.
2. The top of the fruit (the part of the flower) is sunken and hardened. Excessive application of nitrogen fertilizer affects water absorption.
3. The lower leaves or side shoots have brown spots. Excessive manganese due to poor drainage.
Fourth, pepper
The top of the fruit (the falling part) becomes black and soft. Calcium deficiency due to excessive nitrogen or potassium fertilizer and high temperature drying.
V. Cabbage
1. The inside of the ball is brown and rot. Calcium deficiency due to excessive nitrogen fertilizer.
2. In the early and middle stages of the ball, the leaf edge turns brown and rots. Calcium deficiency caused by excessive application of nitrogen fertilizer.
Six, cabbage
1. The heart of the cabbage is brown and rotten. Calcium deficiency due to excessive application of nitrogen fertilizer.
2. In the early and middle stages of the core, the leaf edge becomes brown and rot. Calcium deficiency due to excessive application of nitrogen fertilizer and high temperature drying.
3. Black scattered small spots appear on the epidermis of the main vein of the leaf. Insufficient sunshine, too much nitrogen fertilizer caused poisoning of NO3.
4. The main vein and petiole of the leaf of the heart are crusted. It is due to excessive calcium and the pH of the soil is too high, causing the deficiency of B.
Seven, Artemisia sylvestris
The growth point became brown and necrotic, and the plant height stopped growing. Often due to excess phosphate and dryness caused by calcium deficiency.
Eight, Celery
The heart of the plant browned and rotted. It is a deficiency of calcium or potassium overdose.
Nine, spinach
1. At the beginning of the true leaf development, the leaves are dark green, gradually brown, and fertility is inhibited. Due to excess phosphorus.
2. Yellowing or yellowing between veins. The high pH of the soil causes a deficiency of manganese, especially after rain.
3. Yellow leaf edge of new leaves. The reason is that excess manganese causes ferrite deficiency.
Ten, radish
1. The leaf margin of the middle leaves appears dark purple, and the veins gradually become brown. Soil high phosphorus causes other nutrient imbalances.
2. The center of the root is dark brown and gradually turns pale yellow. The soil has a high pH and too much calcium, causing a deficiency of boron.
XI, Watermelon
1. The leaves with the center of the fruit section are dark spots. 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. Excessive application of nitrogen.
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