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Onion

1. Planting specifications:

one film, two tubes, 9 rows: use a mulch film with a width of 145 cm, lay 2 capillary tubes under each film, the capillary distance is 75 cm, plant 5 rows of onions between the two tubes, and 2 rows of various types on the outside of the two tubes. A total of 9 rows of onions were planted, with a spacing of 30 cm between the membranes. The spacing between plants is 15 centimeters, and 29,000-30,000 seedlings per mu can be maintained.

2. Land preparation and fertilization:

1. Land preparation: Plow and prepare the land in time in early spring. After plowing, rake in time to protect the moisture and create smooth and loose soil conditions.
2. Fertilization: Apply 3,000 kilograms of organic fertilizer per acre, and combine all phosphorus, potassium and 40% of nitrogen fertilizer with spring plowing and organic fertilizer*. The remaining nitrogen fertilizer is applied during the growth period. Apply 30 kg of diammonium phosphate, 20 kg of urea and 10 kg of potassium sulfate per acre.

3. Water dripping and fertilization management:

1. After adopting the drip irrigation technology under the film, the water required for the growth of onions is completed through drip irrigation. The fertilizers are applied by dripping with the water, and the water and fertilizer are synchronized. "Eat less, eat more", and adjust the water and nutrients according to the different development stages of the onions. Need, reasonable supply, to achieve the goal of high yield, dripping water 11 times during the entire growth period, with a total dripping volume of 290 cubic meters per acre.

2. Drip and fertilization management: When using the drip irrigation system to fertilize with water, first calculate the amount of fertilization based on the area of the rotating irrigation area and the amount of fertilizer applied per mu; start fertilizing after 30-45 minutes of normal dripping in the fertilizing irrigation area; drip water in the current round of irrigation area Close the ball valve of the fertilizer tank half an hour before the end; the fertilizer solid particles injected into the fertilizer tank shall not exceed two-thirds of the total volume of the tank; adjust the gate valves on the water outlet and water inlet of the head so that the pressure difference between the front and rear increases on the original basis 0.05Mpa. The dripping time and fertilizing time are determined based on the growth characteristics of onions, mainly the seedling stage, leaf cluster growth stage, bulb expansion stage, and maturity stage.

(1) Irrigate scientifically according to the water demand pattern of onion growth and development. After transplanting onions, water should be dripped once in time to promote seedlings to quickly take root and survive. Drip water 10 times during the entire growth period, totaling 290 cubic meters of water. After slowing down the seedlings, drip water for the first time. From the seedling stage to the leaf cluster growth period (May 20 to June 20), drip water a total of 4 times, with 20 to 25 cubic meters of water per mu each time. During the bulb expansion period, ensure full irrigation, with a total of 5 drips. times, the amount of water dripping per acre is 25 to 30 cubic meters. The bulbs are dripped with water once during the mature period, and the amount of dripping per acre is 25 cubic meters.

(2) Fertilization. When fertilizing, apply 3-4 kg/acre of urea and 1-2 kg/acre of potassium dihydrogen phosphate along with the water drops during the third to seventh drips.

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