Fertilization technology after planting green onions

After the green onion is planted, it is necessary to apply the base fertilizer to the decomposed organic fertilizer, generally applying 5000-8000 kg per 667 square meters . The soil containing less phosphorus is applied with 25 kg of calcium phosphate per 667 square meters , 150 kg of plant ash , or 8-10 kg of potassium sulfate . Further, 667 square meters per reusable applicator sulfate 2 kg, 1 kg of boric acid. Purse and concentrated to basal administered in combination, the soil preparation before Purse applicator, Shi Hougeng to dig the soil, fertilizer fully mixed, and then press OK plane groove colonization. Centralized application is to concentrate fertilization in the ditch. After fertilization, the bottom of the ditch is loosened, so that the base fertilizer in the ditch is mixed with the soil at the bottom of the ditch, and then planted. Practice has proved that fat is the key focus of Summer base yield of green onions.

The top dressing of the green onion should be carried out according to the growth characteristics of the green onion, and master the principle of “light front, medium weight, and attack after compensation”. Light in August, focusing on the next ten days of September, up in mid-October. Topdressing should be combined with cultivating soil and watering; topdressing should combine organic fertilizer with inorganic fertilizer. Do the staged, alternating, layered and mixed application. Topdressing should be based on nitrogen fertilizer, reuse of potassium fertilizer, and take into account phosphate fertilizer. Zhangqiu green onions after planting, the test results of green onions dressing fashion show, in the same amount of basal fertilizer, the former light heavy after that is "Chushu" (Aug. 23-24) per 667 square meters of nitrogen 2.5 kg, 1.5 kg phosphorus, potassium, 2.5 kg; "dew" (Sept. 8-9) 5 kg per 667 square meters nitrogen, phosphorus and 2.5 kg, 5.5 kg potassium; "equinox" (Sept. 23-24) each 667 square meters of nitrogen application 12.5 kg, phosphorus 6 kg, potassium 12.5 kg, equivalent to 6677.5 kg per 667 square meters of output , the highest output, lighter than before (ie, in the " heat treatment " nitrogen and phosphorus, respectively, 12.5 kg, 6 kg and 12.5 kg; "white Dew" NPK were 5 kg, 2.5 kg and 5 kg; "equinox" Shi 2.5 kg, 1.5 kg and 2.5 kg) 3,480 kg per 667 square meters, yield 16.6%; in After the attack, the compensation was 3,900 kg per 667 square meters , which was 12.1 % higher than the previous one . This is because in the hot season after onion planting, transplanting after 2-3 days, they begin to grow new roots, most of the original fibrous roots rot away, see the green heart leaves 8-10 days later, tubular leaf unfolding, but physiological weak roots and leaves, growth retardation, little absorption of nutrients, basal nutrient may be utilized to promote root development and Huanmiao generally administered without excessive fertilizer water. After "Liqiu", the temperature gradually decreased, the root system has basically recovered, and the demand for fertilizer and water has increased rapidly. The "leaf-leaf fertilizer" is required to be applied . Generally, every 667 square meters of high-quality soil and fertilizer is used. , wall soil 3000-4000 kg, or cake fertilizer 150 kg; can also apply urea 10-15 kg. It should be applied to the ridge and fertilized after fertilization to make the fertilizer and soil evenly mixed. After the "heating", the climate gradually cools down, the growth of green onions accelerates, and the amount of fertilizer needs to increase. A second top dressing should be carried out to strengthen the leaf minister. Generally, 50-75 kilograms of crushed cake fertilizer is applied per 667 square meters , and human waste is 750 kilograms. , 30 kilograms of calcium phosphate , 100 kilograms of plant ash , fertilized with water, deep cultivating and soil cultivation after fertilization. After "Bailu", the weather is cool, hot and cold at night, and the temperature difference is large. It is necessary to gradually cultivate the soil and promote the formation of green onion. During the formation of scallion, due to the large amount of growth, the amount of fertilizer needed to reach the peak, should be applied to the "white dew" and "autumn" respectively, the "fruit fertilizer", with quick-acting nitrogen fertilizer, each time 667 square meters of ammonium sulfate 15-20 kg, or 10 kg of urea , 100 kg of plant ash or 12.5 kg of potassium sulphate . The "fertilizer" should be applied to the inter-row ditch, the area closer to the onion root, shallow tillage after application, watering, heavy Watering to fully exert the interaction between fertilizer and water. "Autumnal Equinox" to "cold dew" is the Welsh onion plant vigorous growth period, before the formation of the product to be fat peak, to re-applied fertilizer, higher earth. General application of urea 15 kg per 667 square meters, or 25 kg of fertilizer, plant ash 100 kg, 12.5 kg, or potassium. After the "defrost", the weather gradually became colder, the growth of the onion gradually slowed down, and the nutrition of the outer leaves shifted to the scallion, which made the scallion white and further hypertrophy. In case of premature release fertilizer case, you can consider available nitrogen flushes, 667 m2 topdressing 10-15 kg ammonium bicarbonate. Watering should be reduced to facilitate storage.