Excessive fertilization causes diseases
Vegetables are more economical crops, so many vegetable farmers often invest a lot of organic fertilizers and chemical fertilizers in order to obtain higher yields, which causes the accumulation of soil nutrients and physiological barriers to vegetables. Here, we will briefly introduce the common physiological diseases of several vegetables in greenhouses and greenhouses as follows, so that the majority of vegetable farmers do scientific fertilization.
One, cucumber
1. Yellowing between veins. Excessive application of phosphate fertilizer causes zinc deficiency.
2, yellow and white veins. Excessive potassium fertilizer causes magnesium deficiency.
3. Yellowing and whitening between veins, leaf margins are still green. Excessive application of phosphate fertilizer causes magnesium deficiency.
4. The leaves brown along the veins. Lack of potassium due to excessive application of phosphate fertilizer.
Second, tomatoes
1. There are striped grooves on the surface of the stem, and even cracks appear inside the stem. Excessive nitrogen fertilizer causes the deficiency of calcium and boron.
2. The fruit falling part appeared necrotic, blackened and rotted. Due to the high temperature, dryness and excessive application of nitrogen or potassium fertilizer, the absorption of calcium is affected.
3. The fruit surface around the bract is green. Excessive nitrogen fertilizer and dry climate cause potassium deficiency.
4, poor coloring, fruit surface with dark brown. Caused by a variety of nutrients and poor drainage.
Third, eggplant
1, longitudinal cracks, corkation. Due to excessive nitrogen application, calcium absorption is affected.
2. The top of the fruit sinks and becomes hard. Excessive application of nitrogen fertilizers will affect the absorption of moisture and trace elements.
3, the lower leaves or lateral branches of young leaves have brown spots. Excess of manganese caused by poor drainage.
Fourth, the top of the pepper (falling flower parts) becomes dark and soft. Excessive calcium or potassium and high temperature drying cause calcium deficiency.
V. Cabbage
1. The inside of the ball is browned and rotted. Excessive nitrogen fertilizer causes calcium deficiency.
2. In the early and middle stages of ball formation, the leaf margin becomes brown and decays. Excessive nitrogen fertilizer causes calcium deficiency.
6. Artemisia halodendron
The growing point became brown and necrotic and the plant height stopped growing. Often due to excess phosphate and dry soil causes calcium deficiency.
Seven spinach
1. At the beginning of the true leaf development, the leaves are dark green, gradually turning brown, and fertility is inhibited. Caused by excess phosphorus.
2, yellowing or yellowing between veins. High pH in the soil causes a deficiency of manganese. Especially after the rain is more obvious.
3. Yellowing of leaf margin occurs. The reason is that excess manganese causes ferritin deficiency.
Eight, radish
1. The leaf margins of the middle leaves appear dark purple and the veins gradually become brown. High phosphorus in the soil causes other nutrient imbalances.
2. The dark brown center of the root gradually turns pale yellow. The soil has a high pH and excess calcium.
Nine, watermelon
1. Dark black spots appear on the leaves centered on the fruit-setting section. Excessive potassium application causes magnesium deficiency.
2, vines, Ye Tuchang, the upper part of the vine is thick, difficult to bear fruit. Caused by too much nitrogen.
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