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First, biological characteristics
1. The root of green onion is chord-like fibrous root, which is not divided into main root and lateral root. It is born under extremely short shrunken stem and disc, and new roots are issued successively with the extension of the stem. The root hair is less and the branches are weak. Poor nutrient absorption.
2. The production of scallion depends on the length and thickness of the pseudostem. The growth of the pseudo-stem is affected by the speed of the leaf, the number of leaves, and the size of the leaf area. External factors are affected by temperature, moisture, light and soil nutrients.
3. Welsh onion has wide adaptability, and all kinds of soil can be planted, but the soil is best cultivated with deep soil, good drainage, and organic-rich soil.
Second, fertilization technology
1. Fertilizer requirement
Weighing green onions, sensitive to nitrogen fertilizer demand, each production of 1000 kilograms shallots, about the need to absorb nitrogen 2.0 to 3.2 kilograms, phosphorus 0.6 to 1.2 kilograms, potassium 1.1 to 4.0 kilograms, absorption of potassium to the most, followed by nitrogen, phosphorus at least .
2. Soil fertigation
The soil in Shawan County contains an average of 1.47% organic matter, 39.81 mg/kg of alkaline dissolved nitrogen, 9.63 mg/kg of available phosphorus, and 120 mg/kg of available potassium. During the entire growth period, 85 to 90 kg of nitrogen fertilizer, 45 to 50 kg of phosphate fertilizer and 38 to 40 kg of potassium fertilizer are applied per 667 square meters, and the ratio of N, P and K is 1:0.6: 0.5 throughout the growth period.
3. Fertigation
Choose the land with flat terrain and loose soil for nursery. Apply basal fertilizer in combination with ploughing before plowing. Apply 3-4 tons of organic fertilizer and 20-25 kg of phosphate fertilizer per 667 square meters. Turn autumn into deep soil. Or sowing in early spring.
4. Fertilization at seedling stage
Plant growth at seedling stage is small, combined with irrigation water for every 667 m 2 topdressing nitrogen fertilizer 20 to 25 kg, potassium fertilizer 10 to 12 kg, 2 to 3 times topdressing.
5. Planting and fertilizing
In the middle of May, deep plowing, combined with 3 to 4 tons of quality organic fertilizer per 667 square meters, 10 to 12 kg of nitrogen fertilizer, 24 to 30 kg of phosphate fertilizer, 8 to 10 kg of potash fertilizer, or equivalent compound fertilizer The nutrient base was applied. Before the colonization, the ditch was formed by row spacing, and the ditch depth was 30 cm. The ditch was applied centrally.
6. Field Management
After planting into the hot summer, green onions grow slowly, and the amount of fertilizer needed is small. After the beginning of autumn, the temperature gradually decreases and enters the peak period of leaf growth. The demand for water and fertilizer from plants increases, nutrition should be added in time, and the irrigation time should be 667 square meters each time. Topdressing nitrogen fertilizer 10 kg and a certain amount of potash. Potassium deficiency plots can be appropriately increased potassium fertilizer, can be resistant to disease, increase production, and help preserve in winter.
Welsh onion is a perennial perennial crop of the genus Lycoris, which is resistant to cold, heat and adaptability. Shawan County, onion planting area, good quality, excellent quality, known as "the land of green onions." How to apply scientific fertilization is the key to improving the yield and quality of Welsh onion.