Onion is a biennial vegetable crop with a shallow root system and poor absorption capacity. The growth period is more than 200 days and the yield is high. Therefore, the amount of fertilizer required is large. According to the study, for every 1000 kilograms of bulbs produced , about 2.4 kilograms of nitrogen , 0.9 kilograms of phosphorus , and 4.1 kilograms of potassium are absorbed. The ratio of nitrogen, phosphorus and potassium is 1.6 : 1 : 2.4 . Planting onions should choose fertile loam or sandy loam with high organic matter content, and then turn over 30 cm and then dry for 30-45 days. Combined with deep plowing, high-administered groups per 667 square meters 5000 kg manure, 15 kg of potassium sulfate, superphosphate 50 kg, 30 kg ammonium bicarbonate. Note that the above chemical fertilizer should be added to the organic fertilizer in advance, and mixed for 10-15 days. After deep turning, repeat the squatting after every sunny day, squatting at least 3-5 times, smashing and squeezing, and then carefully finishing the ground . It is tidy before planting, with a width of 120-150 cm and a length of 20-30 meters. Combined with the whole hoe, 100 kilograms of organic biological fertilizer is applied per 667 square meters . After sprinkling, it is finely sputum and then planted.
After the winter, when the temperature starts to rise, it is necessary to remove the grass and raise the ground temperature. When the seedlings began turning green onion, top dressing with watering, dressing 667 square meters per kilogram 1000-1500 dilute manure composting, or 10-15 kg urea, 15 kg or potassium sulfate fertilizer. When the dry soil is exposed on the surface, it is immediately drawn, and the rhizosphere soil is cleaned by combining the sputum, so that the rhizome is exposed to facilitate the growth of the onion. Before and after the Qingming, the leaves entered the vigorous growth period, and watered and topdressed again, and the urine was applied every 667 square meters. Or potassium sulfate compound fertilizer 10-15 kg. Note that the amount of fertilizer should not be too large, and appropriate seedlings for about 10 days in the future , so as not to affect the growth of onion. After the rainy season, when the temperature reaches 20 °C , the onion begins to expand. It needs to be topdressed again with watering . 20-25 kg of urea or potassium sulfate compound fertilizer is applied every 667 square meters .
After the summer, the bulb enters the rapid expansion period, and can be combined with watering to apply the decomposed manure 1000 kg / 667 square meters or potassium sulfate compound fertilizer 10-15 kg / 667 square meters, and increase the number of watering, every 3-5 days 1 water, stopped until 7 days before harvest .
At the same time, but also timely spraying 600 times per half a day up to 2116 times, 2 times before spraying drought special type seedlings after spraying leaf festival dedicated type, spray Guyu postganglionic rhizome special type, can increase 30 More than % .
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