Vegetable leaves are small and yellow, and the growth is not good, how should fertilizer be carried

There are many reasons why vegetable leaves turn yellow, and they cannot be solved by blind fertilization alone. First of all, find the location and reason for the yellowing of the leaves, if it is an old leaf, it is a normal yellow leaf, if the soil unexpectedly PH changes, it becomes alkaline soil, it is necessary to use the acid fertilizer ammonium ferrous sulfate or grass, leaves watered to improve; If there is a serious lack of nitrogen fertilizer, urea, ammonium carbonate, etc. should be watered; If it is chemical pollution, it is necessary to block the source of pollution and improve the polluted environment; If it's stagnant water, drain it, and so on.

Vegetable. First of all, let's analyze the main reasons for the total yellowing of vegetable leaves. The reasons that usually cause the yellowing of vegetable leaves are improper fertilization (such as insufficient trace element fertilizer), improper watering (insufficient water or excessive water resulting in nutrient loss), low ambient temperature leading to obstruction of nutrient absorption of vegetable plants, and insufficient light leading to obstruction of nutrient synthesis of vegetable plants.

According to the above analysis, we can see that most of the causes of yellowing of vegetable leaves are related to the lack of nutrients, so the main measure to prevent yellowing of vegetable leaves is to ensure the nutrient supply of vegetables, that is to say, fertilization is very important in this process.

Vegetable. In fact, in the countryside, when we grow vegetables in the vegetable garden or on our own balcony, we pay the most attention to the bottom fertilizer of the land preparation, and rarely go to the middle of the top dressing, even if they encounter problems, many people are just blindly seeking solutions, so there is a situation of abuse of chemical fertilizers and pesticides.

When it comes to pesticide damage to vegetables, in fact, pesticide damage can also cause yellowing of vegetable leaves to a certain extent. For example, when we use drugs, in order to take effect quickly, we often increase the concentration of pesticides, and although the effect is reached, it is often easy to cause pesticide damage to vegetables. In this case, it should be rinsed with water in time, and an appropriate amount of brassinin should be added to promote the growth of vegetables.

Vegetable. The vegetable plant itself is injured, such as the root is damaged, resulting in obstruction of nutrient absorption, and it is also one of the most common reasons for the yellowing of vegetable leaves, sometimes even because the roots of the plant are damaged, causing vegetables to wilt is also very common, this situation mostly appears in the transplanting process of vegetables, of course, sometimes the bottom fertilizer is too thick, it will also cause the vegetable to burn the roots, which is still the yellowing of vegetables caused by improper fertilization.

Therefore, for different vegetables, we also need to use different fertilizers and adopt different fertilization methods. For example, leafy vegetables, we usually use nitrogen fertilizer and organic fertilizer; Fruits and vegetables should pay attention to the application of base fertilizer, pay attention to the ratio of nitrogen, phosphorus and potassium fertilizer, and root vegetables should not only pay attention to base fertilizer, but also not ignore top dressing.

Vegetable.

The reasons for the small and yellowish growth of vegetable leaves are too much water, insufficient nutrients, and soil hardening. It is necessary to loosen the soil, make the soil permeable and air permeable, and appropriately spray trace element foliar fertilizer and chelated trace element iron fertilizer to improve these conditions.

The causes of vegetable yellow leaves vary depending on the location of the disease. The lower leaves are yellow, one is nitrogen deficiency. Nitrogen is an essential element for plants, and it is highly mobile, so when nitrogen is deficient, they can move from the old leaves to the new leaves, and the symptoms of deficiency from the old leaves gradually affect the new leaves and young leaves.

The second is magnesium deficiency. Magnesium deficiency will cause yellowing of the middle and lower leaves of the plant, and the leaves close to the fruit will first turn yellow during the fruit expansion period, and gradually expand upwards to the whole plant, and the yellowing leaves will lose green between the veins. The third is root injury.

For example, excessive watering of roots, soil compaction and salinization lead to poor root growth, or manure is not rotten and burns roots, etc., so that the root system's ability to absorb nutrients is hindered. The yellowing of the upper heart lobe is mostly caused by the obstruction of chlorophyll synthesis, and the deficiency of zinc, iron, and calcium is the direct factor.

When the temperature rises, the leaves of the plant will curl up a lot. The leaf curl referred to here is that the lower blade rolls upwards and spreads upward, and in severe cases, the leaf rolls into a cylindrical shape. The direct cause of leaf curling is the lack of water in the leaves.

When the plant is deprived of water, the leaves self-regulate and close the stomata to reduce water transpiration and roll up the leaves. On the one hand, it is caused by high temperature and drought, and on the other hand, the main reason for the occurrence of yellow leaves and leaf curling of vegetables with insufficient water absorption is that the root system is not good. Vegetable farmers should not neglect to raise roots in management, and do not look at the weather to get warmer.

The soil is often not short of fertilizer, but the poor absorption capacity of the plants, resulting in insufficient nutrients. In view of this situation, vegetable farmers should pay attention to the application of rooting agents, biological fertilizers, chitin and other fertilizers with rooting and rooting effect when fertilizing, so as to promote the regeneration of capillary roots of plants and enhance the absorption capacity of roots to mineral nutrients in the soil. When yellow leaves and leaf curls appear, while taking root fertilizer to irrigate the roots, foliar fertilizer should also be sprayed in time, and leaf fertilizer containing amino acids, nucleotides and boron, magnesium, zinc and calcium can be used to supplement various medium and trace elements, which can alleviate the problem of yellow leaves and leaf curling in the short term.

After the weather warms, vegetable farmers can remove the mulch film in the operation row, and at the same time use iron bars to support the mulch film in the planting row, which is arched, and then lift the mulch film slightly, draw a hoe, and plow the soil compacted layer to make the surface soil loose and increase air permeability.

Solution: We must strictly control the frequency and amount of fertilizer, and adjust it according to the different growth stages of cucumbers. For example, potassium fertilizer is the main fertilizer in the middle and late stages, and the nutrient ratio of fertilizer is balanced, and it is applied every half a month or so.

At the seedling stage, about twice the field ditch is used to divert water, while draining the water, and at the same time, the sprayer is connected to the water to wash the plants to achieve the effect of diluting fertilizer. After 3 hours of water diversion, drainage, and scouring, the water diversion will be stopped, and the stagnant water in the field will be drained.

After planting, the growth of the <> cucumber plant is not slow, and the growth point of severe disease sometimes dries up, and the leaves wither, especially the edges are yellow and dry. There are irregular yellow dots on the top of the new leaf, and the veins remain green, but the veins lose green and turn yellow in the middle. Cucumber is one of the main vegetables planted in greenhouses, and greenhouse planting due to unreasonable application of megalopolis fertilizer, it is true that in recent years, the fertilizer damage of vegetables has become more and more.

Yellow leaves are a common problem in the process of cucumber planting, such as insufficient fertilization or fertilizer, various pests and diseases will lead to cucumber yellow leaves.

First of all, it is necessary to do a good job in root maintenance, and you can apply products that can promote root growth, such as microbial inoculants or chitin, etc., to raise the root system well before restoring the absorption capacity of the root system. 1. Watering, reducing fertilizer concentration, and flushing photonutrients.

2. Foliar spraying of amino acids and photosynthetic nutrition to supplement consumption and maintain foliar growth.

It can be used with fully decomposed pigsty fertilizer or commercial organic fertilizer, which can improve the physical and chemical properties of the soil, promote the formation of aggregate structure, and improve the nutrient buffering capacity of the soil, especially the humic acid generated after decomposition, which can prevent the accumulation of salts and delay the process of soil salinization if vegetables need vaccines. Wait until after the vaccine. In the instructor.

Nutrient solution. If the vegetables are sown directly. It doesn't take a second.

Tap water keeps the soil moist and grows before the nutrient solution can be used. Generally, the amount of nitrogen fertilizer used in fruit and vegetable vegetables should be controlled within a certain range according to the period of vegetable development, and the amount of nitrogen fertilizer required at the seedling stage is more, and the amount of nitrogen fertilizer in the reproductive growth period should be reduced.

Bacillus subtilis and other biological agents are very effective in preventing disease damage, improving leaf yellowing, and improving disease resistance, and regret jujube does not produce drug resistance, high safety, and will not cause pesticide damage, which can be used as the first choice for disease prevention. In addition, choose a spray instrument with good atomization effect, spray the filial piety medicine evenly, and do not repeat the spray, which can reduce the probability of drug damage.

It should be fertilized when it is planted, and then fertilized when it emerges, so that the vegetables will have high nutritional cavity scores, and there will be yellow leaves and curly leaves only in the front.

What to do with the yellow leaves of greenhouse vegetables?

1. Rational use of foliar fertilizer.

Foliar fertilizer is directly sprayed on the surface of the leaf for the leaf to absorb the fertilizer, vegetable farmers can choose foliar fertilizer reasonably and effectively according to the actual needs, focusing on supplementing calcium, boron, zinc, iron and other trace elements, as well as supplementing amino acids, alginic acid, chitin and other organic functional products. From the seedling stage, foliar fertilizers can be sprayed, such as chitin and alginic acid, which can increase the thickness of leaves or improve the disease resistance of vegetables; Calcium fertilizer can improve cell strength and activity, improve stress resistance, and reduce the occurrence of diseases. Boron fertilizer promotes flower bud differentiation.

2. Spray pesticides reasonably.

In recent years, the new greenhouse facilities are getting bigger and bigger, and it is two or three hundred meters at every turn, spraying medicine once, at least a dozen buckets of water, and hundreds of kilograms of liquid medicine. In order to reduce the burden of spraying, vegetable farmers often spray a large number of compound pesticides, fungi, bacterial diseases and viral diseases and other insect pests, a spraying, will compound seven or eight or even a dozen kinds of pesticides, this phenomenon has become the norm, resulting in widespread pesticide damage, seriously affecting the photosynthetic efficiency of leaves.

Foliar spray is the fastest, most economical and most effective method of supplementing iron fertilizer, iron fertilizer is divided into inorganic iron fertilizer and organic iron fertilizer and chelated iron, chelated iron fertilizer ** is very expensive, the cost is relatively high. In production, ferrous sulfate + urea can be used to make organic iron fertilizer for spraying, which is the most economical method. The specific preparation method is to add 150 grams of ferrous sulfate + 150 grams of urea per 100 kg of water, and urea forms chelated iron with iron ions in the form of complexes.

This kind of organic iron fertilizer has a low cost and has a good effect on preventing and controlling iron deficiency and green loss. Generally, the leaves can turn green in 3 to 7 days after spraying.

1. The yellowing of green cabbage leaves may be due to the lack of magnesium in chloroplasts in green cabbage leaves, which leads to a decrease in photosynthesis and a decrease in the amount of synthetic organic matter, which cannot be supplied to the greens themselves, so the yellowing of the leaves will occur.

2. The yellowing of green cabbage leaves may be caused by excessive application of potassium fertilizer, and excessive potassium is the most common reason for the yellow edge of the leaves in the greenhouse production, so we must pay attention to the amount of fertilizer when planting.

3. Excessive application of micro-fertilizer will also cause yellowing of green vegetable leaves, so boron is a trace element and the amount should not be too much.

4. Tobacco damage in vegetables will also cause the phenomenon of yellowing of green leaves, and the edges of vegetable leaves turn white and yellow, which is mostly caused by the excessive use of insecticidal aerosols, so attention should be paid to prevention and fire in the shed should be avoided.

5. Yellow leaves of green vegetables caused by improper management. For various reasons, such as excessive watering or untimely drainage after rain, vegetable leaves can also turn yellow.

In the process of planting and growing vegetables, if the leaves are yellow, it may be that the water is too much, and the water is too small, which can cause the leaves to turn yellow, and it is also possible that the nutrients in the soil are not enough, so the food can not be well supplemented with nutrients, and the leaves will be yellow, and the soil can be improved with an appropriate amount of fertilizer.

Cabbage fertilizer leaves yellowing is the production of fertilizer damage, a time too much fertilizer, will make the concentration of soil solution too high, greater than the concentration of plant cell solution, plant cells lose water, resulting in plant wilting due to water loss; When the situation is more serious, it will cause the seedlings to be burned Watering after fertilization can reduce the concentration of soil solution, so that the concentration of soil solution is less than the concentration of crop cells, so that crop cells can absorb water normally. Therefore, the best solution is to water abundantly.

1. Several common irrational application of chemical fertilizers.

Unreasonable fertilization is usually caused by the unreasonable amount of fertilization, fertilization period, and fertilization method. Common phenomena are:

1. Shallow fertilization or sprinkling. Fertilizer is volatile, lost or difficult to reach the roots of crops, which is not conducive to crop absorption, resulting in low fertilizer utilization rate. Fertilizer should be applied 16-650px below the seed or plant side.

2. Dichlorofertilizer. The compound fertilizer produced with ammonium chloride and potassium chloride is called dichlorofertilizer, which contains about 30% chlorine, is easy to burn seedlings, and should be watered in time.

3. Urea-based compound fertilizer. Reduced biuret has high nitrogen content and is easy to burn seedlings, so it is necessary to pay attention to the depth of watering and fertilization.

4. Improper application of chemical fertilizers to crops may cause fertilizer damage, seedling burning, plant wilting and other phenomena. If too much one-time application or insufficient soil moisture after fertilization, the concentration of soil solution will be too high, and it will be difficult for crop roots to absorb water, resulting in wilting and even death of plants.

5. Excessive use of a certain nutrient will not only poison crops, but also prevent crops from absorbing other nutrients and cause nutrient deficiency. For example, excessive nitrogen application can cause calcium deficiency; Too much potassium reduces the availability of calcium, magnesium, and boron; Too much phosphorus reduces the availability of calcium, zinc, and boron.

6. It is not suitable to directly apply fresh human feces and urine. Fresh human feces contain a large number of germs, toxins and parasite eggs, if applied directly without rotting, it will contaminate the crop and easily transmit diseases, and it needs to be fermented at high temperature or harmless before it can be applied.

2. Precautions for reasonable fertilization.

In order to prevent the occurrence of the above fertilizer damage, attention should be paid to reasonable fertilization.

1. Increase the application of organic fertilizer to improve the buffering capacity of the soil.

2. Soil testing and formula fertilization, according to the level of soil nutrients and the demand of crops for nutrients, reasonable fertilization, do not increase the amount of fertilizer at will.

3. Full-layer fertilization. The same amount of chemical fertilizer, when applied locally, often causes a sharp increase in the concentration of local soil solution, damaging the root system of crops, so that the fertilizer is evenly distributed in the entire tillage layer, so that the crops can avoid damage.