"intestinal lavage grass" is leek hair product? What kind of medicine do you take when the leaves turn yellow? What is the easiest way to plant?

Leek, alias Fengben, grass stalactite, Qiyang grass, lazybones, Changsheng leek, Zhuangyang grass, flat vegetables, etc., strong adaptability, cold and heat resistance, cultivated all over the country. Is it a hair product? What kind of medicine do you take when the leaves turn yellow? What is the easiest way to plant? It is understood that hair refers to nutritious or irritating food that can easily induce some diseases (especially old diseases) or aggravate existing diseases. Leek belongs to spicy hair, which is a practical hair product summarized by the folk. Hair taboos are of great significance in diet health and diet treatment. Under normal circumstances, hair products are also food. Eating a moderate amount of food will not cause side effects or discomfort to most people. It is only for some special physique and some related diseases that it will induce the onset of the disease.

What medicine does the leek leaf yellow hit?

The yellowing and death of leek is a production problem often encountered by vegetable farmers. in the process of prevention and treatment, due to the lack of accurate judgment of symptoms, drug abuse is more common, the result is often spent money, labor, but did not receive the desired control effect. So first of all, we should know the cause of yellowing, and then prescribe the right medicine.

First, common reasons

1. Caused by non-infectious diseases. The occurrence characteristics are as follows: leek leaves focus on leaf withering in a short period of time, the occurrence time is often highly consistent, the symptoms are unified, even if there is a change is also caused by changes in environmental conditions, the disease has no infectivity. It mainly includes: ammonia poisoning, acid damage caused by low soil pH value, element deficiency (caused by a large number of elements or trace elements deficiency, mainly nitrogen deficiency, calcium deficiency, magnesium deficiency, boron deficiency, iron deficiency and so on. At present, the phenomenon of dry-pointed yellow leaves of leek is mostly caused by calcium and boron deficiency in soil) and high temperature damage.

two。 Caused by infectious diseases. The characteristics of this kind of disease are as follows: the occurrence of this kind of disease is gradually expanded from point to surface, gradually spread, local or multi-point infection occurs, often appear powdery, mildew, spots and other symptoms, the expansion of disease spots on the leaves lead to leaf drying and death. Common diseases include blight, gray mold, virus, Sclerotinia sclerotiorum and so on.

3. Harmful to pests. Mainly leek maggots and thrips.

II. Countermeasures

1. Prevent ammonia poisoning. Ammonia poisoning mainly occurs in the greenhouse, so do not directly apply a large amount of ammonium bicarbonate and urea and cake fertilizer on the ground before and after film mulching; acidified soil can not be adjusted with quicklime; the shed is properly ventilated and does not pass through the bottom air in principle. Only open the middle and upper air vents. If the above three points are achieved, the harm of ammonia poisoning can be effectively prevented.

two。 Avoid causing soil acidification. Chemical acid fertilizer and physiological acid fertilizer should be avoided; quicklime can be used to adjust soil acidity and alkalinity for leek in open field; ammonium nitrate and urea can be applied after covering plastic film in greenhouse, ammonium bicarbonate, cake fertilizer and manure are strictly prohibited, and timely watering after fertilization.

3. Prevent the occurrence of element deficiency. When applying fertilizer, attention should be paid to increasing the amount of barnyard manure and reducing the amount of chemical fertilizer; reasonable collocation of nitrogen, phosphorus and potassium fertilizer and supplement of trace element fertilizer to ensure a balanced and adequate supply of nutrition.

4. Avoid the harm of high temperature. For leek in greenhouse, proper ventilation and watering is the key to prevent high temperature damage. When the temperature in the shed reaches 20-25 ℃, light wind should be released. As the temperature rises, the air volume should be increased. In principle, there is no bottom air, only the middle and upper vents are opened, the ventilation speed should be slow, and a large number of cold air should not be allowed to enter. The temperature in the greenhouse should not be higher than 30 ℃ in daytime and 8 ℃ at night, and the temperature difference between day and night should be reduced as much as possible. It should be watered at the right time at high temperature, and the heat resistance of leek can also be enhanced by increasing the application of nitrogen fertilizer. In the high temperature season in summer, open leek should be cultivated with sunshade net to reduce the temperature and light intensity.

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Time: 2019-04-10 Click: