"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.

5. To prevent and cure epidemic diseases. Resistant varieties were selected for ①. ② crop rotation. The seriously affected plots usually change the stubble once every 4 to 5 years, which can reduce the occurrence of the disease. ③ strengthens fertilizer and water management. In open field cultivation, attention should be paid to the application of organic fertilizer and reasonable irrigation, and watering should be controlled after entering the high temperature and rainy season (the temperature is higher than 32 ℃), especially to eliminate stagnant water in time after rainstorm to prevent excessive humidity in the field. Greenhouse cultivation should pay attention to timely ventilation to prevent excessive humidity in the greenhouse. ④ cleans the countryside. No matter cultivated in protected or open field, the fields should be cleaned in time after harvest, diseased leaves, residual plants and weeds should be removed and taken out of the field to be buried or burned. ⑤ chemical control. At the initial stage of the disease, it is mainly spraying in the field to prevent re-infection; when the central disease area occurs in the field, it is necessary to find the right time to spray and irrigate at the same time. The medicament has 90% ethanophosphate aluminum 500x liquid, 70% mancozeb 800x liquid, and 72% aldicarb 1200 times liquid. The three agents should be used alternately, spraying once every 6-7 days for 2-3 times in a row. In addition, the above solution can also be dipped in the leek root for inverted planting.

6. Prevention and control of gray mold. Disease-resistant varieties were planted in ①. ② strengthens its management. In addition to drainage and humidity reduction, it is also necessary to apply sufficient mature organic fertilizer and increase phosphorus and potassium fertilizer to improve plant disease resistance; after each harvest, the diseased plants should be removed from the field and buried or burned to reduce the source of the disease. ③ chemical control. After each harvest and the early stage of the disease, spraying 4% pyrimidine nucleoside antibiotics (melons, vegetables and tobacco type) 500 × 600 times, or 50% ethinolide 1000 times, can effectively control the occurrence of the disease.

7. Prevention and treatment of virus. Disease-resistant varieties were planted in ①. When ② leek is harvested, the healthy plant is harvested first, and then the diseased plant is harvested. After harvesting the diseased plant, put the cutter in 10% sodium phosphate aqueous solution for disinfection. When onion aphid or peach aphid occurs in ③ leek, it should be controlled in time. ④ chemical control. Can use 2% Ningnanmycin 200 times 300 times liquid spray, 7 times 10 days spray once, even 2 times 3 times. If the first spray combined with root irrigation, the effect will be better.

8. Control Sclerotinia sclerotiorum Resistant varieties were selected for ①. ② manages fertilizer and water well to prevent stagnant water on the ground; apply fertilizer thinly frequently to avoid excessive and partial application of nitrogen fertilizer; regularly spray foliar nutrients rich in micro-fertilizer elements, shorten the cutting cycle, improve interplant permeability, and help to reduce the disease. ③ spraying in time to prevent diseases. Spraying prevention begins after each cutting of leek to the new plant extraction stage, and the agent can choose 2000 times liquid of 50% carbendazide wettable powder, or 1000 times liquid of 50% isobarbamide wettable powder, or 400 times 500 times liquid of 5% Jinggangmycin water agent, once every 7 days and 15 days, spraying 2 times 3 times, focusing on the base of the plant.

9. Control leek maggots. ① fertilizing scientifically. Do not apply immature organic fertilizer, adult damage must not be poured sparse dung water, organic fertilizer should be ditched to cover the soil. ② low temperature drying method. When the soil begins to thaw in spring, the topsoil around the leek root is removed with a bamboo stick to expose the leek maggot to the surface. Once the leek maggot is exposed to low temperature and dry air, it will die naturally. The soil should be picked in time, it is better early than late, and if the surface soil has not been completely thawed, it will be carried out in the afternoon of sunny and warm weather. ③ sweet and sour liquor entrapment. Making use of the chemotaxis of leek maggot adults, a mixture of sugar, vinegar, wine, water and 90% trichlorfon was prepared according to the proportion of 3 ∶ 3 ∶ 1 ∶ 10 ∶ 0.1. generally, a trap basin was placed every 30 square meters, and the trapping solution was changed every 5 to 7 days, and vinegar was added every other day. ④ chemical control. In order to control adults, the stems and leaves can be sprayed with 1000-1500 times of 20% fenvalerate EC at the peak of Eclosion, and the control effect is better at 9: 10 a.m. The control of larvae can be used in early spring and late autumn, when it is found that the leaf tip begins to yellowing and softening and gradually lodging to the ground, irrigate the root with 48% chlorpyrifos EC 1500 times per mu, or with 50% phoxim EC mixed with 400 times of Bacillus thuringiensis, usually in the peak period of disease and insect pests, but at least 10 days from the harvest time.

10. Control thrips with onion. ① cleans the countryside and removes dead branches and fallen leaves in time. ② should be irrigated timely. In case of drought from April to May, it should be watered in time to prevent the spread of insect pests. ③ chemical control. It can be sprayed with 6000 times of synergistic cyanogen horse EC or 1000 times of phoxim EC. ​

What is the easiest way to grow leek?

There are two ways to cultivate leek:

I. seed sowing method

Buy or harvest the seeds of last year's leek and sow them directly in the field. In general, the sowing rate is ten jin of seeds per mu.

2. Asexual reproduction

Split-root cultivation of leek can generally be transplanted in March, April or August of the Gregorian calendar, this chemical quantity is large, but the recovery growth is fast. Can also enter the high yield period as soon as possible.