Soilless cultivation technique of Chinese chive

Soilless culture leek can choose to use 18-20cm depth flowerpot or wood trough cultivation, and then filled with 1-2 mm grain size river sand, select more than 2 years of open field leek roots, cut off old leaves, old roots, keep short stem roots inserted into the flowerpot irrigation, later according to the growth of watering and nutrient solution, keep the bed temperature at 14℃, temperature at 16℃, winter needs to be covered with small shed for heat preservation.

1. Soilless cultivation techniques of leek

1, with a depth of 18-20cm flower pots or wooden trough, filled with river sand particle size of 1-2mm, river sand needs to be washed clean with water, so as not to carry bacteria.

2. Select the roots of Chinese chives in the open field for more than 2 years, then cut off the old roots and leaves, keep the shortened stems and roots and insert them into the flowerpot, with an average of 3-4 plants and 1 pinch, and the plant spacing and row spacing are about 3.3cm.

3. After planting, irrigate it thoroughly, and then irrigate it according to the growth situation in the later stage. After the new roots emerge, irrigate nutrient solution again. Generally, irrigate water and nutrient solution once every 1 day. In spring, summer and autumn, irrigate it once every 1-2 days. In winter, irrigate it once every 3-5 days. In rainy days, afternoon and evening, do not irrigate nutrient solution. When the leaves are yellow, black and few, irrigate nutrient solution more.

4. The formula of nutrient solution for soilless culture of leek is water 15kg, ammonium sulfate 22.5g, potassium dihydrogen phosphate 22.5g, which can be used to irrigate about 30 pots of leek.

5. The suitable bed temperature for sand culture leek is 14℃, the temperature is 16℃, and it can grow normally when the bed temperature is 6℃ and the air temperature is about 10℃. When entering winter, it should be covered with bedding shed to keep warm.

6. There is a natural dormancy period of about 1 month before and after frost of sand culture leek. You can choose to cut off leek leaves after the beginning of winter and let them continue to grow.

II. Growing conditions of leek

1, temperature: chives like cold, cold, heat resistance, seed germination suitable temperature is above 12℃, growth suitable temperature is 15-25℃.

2, light: leek growth needs moderate light, leek tolerance is strong, but the light is too weak, will make the accumulation of photosynthetic products less, resulting in fewer tillers and weak, so the phenomenon of low yield, premature aging, and light, temperature is too strong, will cause more fiber, poor quality.

3. Moisture: The suitable air humidity for leek is 60-70%, and the suitable soil humidity is 80-90% of the field water holding capacity.

4, nutrition: strong ability to adapt to soil, suitable pH planting is 5.5-6.5, leek growth period requires large amount of fertilizer, strong fertilizer tolerance.

3. Control of diseases and insect pests of leek

1. Grey mold and sclerotia disease: in that early stage of the disease, 45% chlorothalonil smoke agent or 10% sukeling smoke agent is selected in cloudy days, the dosage is 250g per mu, 6-8 points are respectively lit, then the shed is closed for 3-4 hours, 10% megalomid dust agent, 50% chlorothalonil dust agent or 6.5% multi-bacteria megalomid dust agent can be sprayed in the evening, the dosage is 1kg per mu, 50% prohydantoin wettable powder and 50% methadone wettable powder can also be sprayed in 1000 times solution, Spray for control.

2. Epidemic disease: In the early stage of disease, 600-800 times of 72.2% Pulike aqueous solution, or 700 times of 72% Kelu wettable powder, or 1000 times of 60% ethyl phosphorus aluminum wettable powder, or 800 times of 25% metalaxyl wettable powder can be used. The application method is the same as gray mold.

3, white silk disease: in the early stage of the disease, can be used 1000 times 15% triadimefon, or 1200 times 20% methyl chlorphos irrigation roots.

4. Rust: In the early stage of disease, spray 1500 times of 15% triadimefon wettable powder, or 2000 times of 20% triadimefon emulsifiable solution, or 1500 times of 97% diruxin wettable powder.

5. Bacterial soft rot: In the early stage of the disease, it can be killed with 500 times solution 77%, or 1000 times solution potassium permanganate, or 2500 times solution agricultural streptomycin, or 3000 times solution chloramphenicol.

6. Virus disease: In the early stage of the disease, soybean milk water of 1:40 or 0.2% potassium dihydrogen phosphate can be used to spray leaves. The medicine needs to be used alternately. It can be sprayed once every 7 days or so, and it can be sprayed 2-3 times continuously.

7. Allium maggot: You can choose to spray leaves with 2000-fold solution of 48% Lesben EC, 800-fold solution of 80% dichlorvos EC, or 1500-2000-fold solution of 2.5% Gongfu EC at the peak of adult emergence.