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 and physiological barriers to vegetables, especially in greenhouses and vegetables. The performance is introduced as follows, so that the majority of vegetable farmers can achieve scientific fertilization.
First, cucumber
1. Yellowing between veins: Excessive application of phosphate fertilizer causes zinc deficiency.
2, yellow veins between the veins: excessive potassium fertilizer caused magnesium deficiency.
3, yellow and white between the veins, the leaf margin is still green. Excessive application of phosphate fertilizer caused magnesium deficiency.
4, browning along the veins of the leaves: the reason is excessive potassium fertilizer to cause potassium deficiency.
Second, tomatoes
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. Necrosis, blackening and rot of the flower falling parts. The absorption of calcium is affected by high temperature, dryness and excessive application of nitrogen or potassium fertilizer.
3. The fruit surface around the bracts is green. Excessive nitrogen application and dry climate cause potassium deficiency.
4, poor coloration, fruit brown with brown. Due to the accumulation of various nutrient segregants and poor drainage.
Third, eggplant
1. The sepals are longitudinally split and the corks are corked. Calcium absorption is affected by excessive application of nitrogen fertilizer.
2. The top of the fruit is sunken and hardened. Excessive application of nitrogen fertilizer affects water absorption.
3. The lower leaves or side branches have brown spots. Excessive manganese due to poor drainage.
Four peppers
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.
Five, 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 rot. 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 veins of the heart of the leaves, the petiole appear molting. It is due to excessive calcium and the pH of the soil is too high, causing a deficiency of boron.
Seven, Artemisia scoparia
The growth point turns brown, necrosis, and the plant height stops growing. Often due to excess phosphate and dry soil causes calcium deficiency.
Eight, 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 high pH of the soil causes a deficiency of manganese, especially after rain.
3. Yellowing of the leaf margin. The reason is that excess manganese causes ferrite deficiency.
Nine, 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.
Ten, watermelon
1. Dark black spots appear on the leaves centered on the fruit section. Excessive application of potassium fertilizer causes magnesium deficiency.
2, vines, leaves long, the upper part of the vine becomes thick, difficult to be strong. Excessive application of nitrogen.
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