First, scientific fertilization The first fertilization will be carried out after the return of spring in spring to supplement the growth of the onion root system and lay the foundation for the vigorous growth of the aboveground parts. Fertilization should be based mainly on fully decomposed organic fertilizers, with 1,000 kg applied per acre, adding 20 kg of superphosphate and 10 kg of potassium sulfate. When the onion plants grow to 8 to 10 true leaves and the bulbs start to expand, they begin to apply the head fertilizer and apply it for 2 to 3 times. Each square meter can be applied with 10-20 kilograms of sulfuric acid. Fertilizer is applied in the middle of the bulb expansion. The emphasis is on the amount of fertilizer to be applied. When the bulb begins to swell, do not apply too much nitrogen to prevent the plant from "greediness." During bulb expansion, potassium sulphate should be added during fertilization at an amount of 5 to 10 kilograms per mu, since potassium deficiency from onions can result in poor storage stability. Second, timely watering Pre-winter planting onions, spring water poured back to Qingshui, poured back to Qingshui timely, premature watering will reduce the temperature of the soil, is not conducive to the growth of onions, will inhibit the growth of plants too late, the occurrence of leaf tip phenomenon. When onion bulbs begin to swell, it is necessary to control the length of seedlings and seedlings according to the soil, climate, and plant growth conditions. When sandy soil or climate is dry, it is necessary to shorten the seedling period; viscous soil, low-lying, It is necessary to appropriately extend the seedling stage during the rainy season. The purpose is to promote the expansion of onion growth into bulbs, which generally takes about 10 days. It is generally believed that the mature tubular leaves of onions turn dark green, the leaves are hypertrophied, the waxiness of the leaves is increased, and the color of the heart leaves is deepened, which is the sign of the end of the seedlings in this period. After the seedlings are planted, they are generally poured with water every 5 days to promote the rapid expansion of the bulbs. When the plants in the field are partially lodged, watering is stopped to avoid storage after the bulbs are harvested. Third, cultivator soil When onions do not cover the mulch, cultivators must be used before seedlings. More viscous soils have more cultivating times than sandy soils, and the cultivating depth should be controlled within 3 cm, slightly closer to the plants and deeper away from the plants. After planting ridges, stop cultivating. In the middle of cultivating, earthing can be properly performed. Fourth, harvest storage It is generally harvested around mid-June. The main signs of mature onion bulbs are: In the late stage of bulb expansion, no new leaves are filled with leaf sheaths. The pseudo-stems are hollow and the plants are dumped from the base of the pseudo-stem. The sooner or later of bulb maturity period is related to the characteristics of onion varieties, planting time and climatic conditions. The varieties with short dormancy period and poor storability should be harvested as early as possible. When half of the plants fall down, they can start harvesting, while the harvest time of late-maturing varieties is late, and 70% of the plants should be harvested when lodging. Harvesting should be carried out on a sunny day, with several sunny days being best. The whole plant will be pulled out at the time of harvest and spread for 2 to 3 days. When drying, only dry leaves, no sunning, bulbs should be covered with leaves, which can promote the ripening of bulbs and dry the skin. Then remove the soil and cut the fibrous roots and dead leaves to store them. Some of them do not go to the leaves after harvest, and they are directly compiled or bundled and stored. We are manufaturer for kinds of Fruit. We have orange, apricot,etc. Healthy food. Fruit Fresh Apricot,Organic Navel Oranges,Mandarin Orange,Sweet Citrus Chengdu Minghe Agriculture Co.,Ltd , http://www.cdmhny.com
After onions return to green in autumn