Wet yellow
Excessive soil moisture, resulting in anoxic soil, make crop roots difficult to breathe, root water absorption, absorption of fertilizer obstructed, growth can not be normal and cause the young branches of the new leaves pale yellow, old leaves are gradually yellow, and then withered and died.
Should loosen soil, drain water, and control the amount of irrigation.
Dry yellow
Drought will cause wilting in seedlings. At this time, the photosynthesis of the plants decreased, the growth stopped, the transport of photosynthetic products was blocked due to lack of water, the organic substances in the plants were heavily hydrolyzed, and the respiration increased, thereby consuming a large amount of organic matter. Due to the redistribution of water in the plants, the new leaves seize the water from the old leaves, causing the yellow leaves to fall off.
Should be timely irrigation according to soil moisture and changes in leaves, watering soaked.
Dark yellow
The normal growth of plants requires twice the light intensity above the light compensation point. At this time, in addition to compensating for respiratory consumption, the organic matter produced by plant photosynthesis can meet the normal needs. If the light is insufficient, the plant cells will not be able to differentiate smoothly, the seedling stems will be thin and the leaves will be yellow.
Preventive measures for the timely increase of light, greenhouse plants can be artificial light, choose different colors of plastic film to adjust the light quality, in order to increase production, improve quality or reduce the role of pests and diseases.
Yellow
During the course of crop growth, the pests often invade, especially the various insects that feed on the leaves and sucking mouthpieces, resulting in leaf shrinkage, curling, and spotting and yellowing of the leaves.
Should pay attention to observation, early prevention, for pests, timely and appropriate symptomatic spraying.
Yellow disease
Blight, rust, and leaf spot blight both affect the survival rate of crops and cause plant growth. Therefore, we must constantly observe the crops and growing up, and regularly disinfect the soil and destroy pathogens in the soil.
Yellow
In addition to the large demand for nitrogen, phosphorus, and potassium, crops are also very sensitive to certain trace elements. In the absence of crops, they can cause physiology disorders of the crops, resulting in various symptoms of the crops, which are chlorotic and yellowing in the leaf color. .
Trace element deficiency in crops is mainly the result of long-term non-replacement or long-term single application of nitrogen fertilizers. To improve the soil every other year, pay attention to applying organic fertilizer.
Yellow
If the fertilization is too thick and too much, it will cause the permeation transport of plants to be hindered. The new leaves will become hypertrophy, the leaves will fold without stretching, and the old leaves will turn yellow without falling off. In the absence of fertilizer, it will cause delicate branches, long internodes, thin and yellow leaves.
Rational fertilization can improve the photosynthesis of plants. For example, nitrogen and magnesium promote the growth of foliage, increase photosynthesis area, increase chlorophyll content and increase photosynthetic rate; nitrogen, calcium and zinc extend leaf lifespan, and thus prolong photosynthesis time; phosphorus, potassium and boron improve transport and distribution of photosynthetic products. In addition, rational fertilization can improve the soil and create a good living environment for the plants. The application of organic fertilizers can increase the structure of the soil pellets, not only improving the water, gas, and temperature conditions of the soil but also promoting the growth of roots and the absorption of fertilizers. It can also promote the activity of soil microorganisms, accelerate the decomposition of organic matter, and improve the supply of nutrients. situation.
Acid yellow
In alkaline soils, iron, calcium, phosphorus, magnesium, zinc, etc. easily form soluble compounds, thereby reducing the absorption of these elements by plants and causing yellow leaf disease. When the soil is too acidic, iron, aluminum, manganese, etc. dissolve too much and the plants will be poisoned by excessive absorption. Therefore, controlling the pH value of the soil is an important means to ensure the normal growth of seedlings. For excessively alkaline soils, ammonium salts may be added. For excessively acidic soils, more soil may be used to adjust the pH of the soil to make it suitable. For crop growth.
Yellow drug
Improper spraying of pesticides or excessive concentration causes phytotoxicity to the crops and the leaves are usually yellow off. Therefore, when using pesticides, we must strictly follow the instructions and spray according to a certain proportion. Once phytotoxicity occurs, rinse with clean water as soon as possible to reduce the drug properties.
Huang Huang
In the spring sowing, if the temperature is lower than the minimum temperature for normal growth of the crop, the viscosity of the protoplasm in the plant cells will increase and the cell infiltration will decrease, which will lead to a decrease in the respiratory rate, and the absorption of water and mineral elements will slow down. Yellow wilt phenomenon. At this point, should pay attention to cold.
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