Planting purple onions on sandy soil

Vinh Chau town (Soc Trang) is developing nearly 6,000 hectares of purple onions, concentrated in Vinh Hai, ward 1, ward 2, Vinh Phuoc ward, Lai Hoa.
According to the farming experience of local people, this crop is inherently adapted and grows in sandy soil conditions. For purple onions for seeds as seed, the requirements for soil require an appropriate ratio of sand mixed to keep the seeds longer.

According to people in Vinh Chau, if the time of planting onions to keep seeds starts from April and May of the lunar calendar, the commercial onion crop (the main production crop) falls around September of the lunar calendar, lasting until after Tet about 2 months. , 3 months. Due to the short life cycle, every year, people grow onions continuously for 3 to 4 crops. First, about onions, people carefully choose dark purple bulbs, firm, do not grow young roots, round bottoms, no signs of pests. After that, people peeled the top shell and planted it. The volume of onion seed corresponding to about 1,000 m2 of arable land is 70-90 kg. In terms of soil, because this type of agricultural product does not like water, when making land, people often make high beds to avoid waterlogging. In addition, people always focus on growing onions, which must fall in the rainy months to avoid tuber rot. After planting, farmers cover a thin layer of straw on top and then water to create enough moisture for the soil beds. After about 2 months of planting, when the onion leaves turn red, wilt and fall on the bed, farmers will harvest. For easy transportation, people pull up onions and then dry the whole plant for about 2 to 3 days for the leaves to dry completely, limiting leaf rot that affects the tubers. Fertilizer formula can be changed according to the soil, weather and green color of onions. If the onion is bad, you should water it with SA or DAP to make the leaves and roots grow, don’t water the leaves will stretch out (cow onion) to create difficult tubers. In terms of care, in the first 10 days watering 1 to 2 times / day, 11 days onward watering every 2 days, the amount of water changed from 1,000 m2 / time (400 to 600 liters / time) and stopped watering completely. 1 week before harvest. The amount of water must be increased steadily, if watering irregularly, the tubers will be torn. Weeding twice in the first 35 days, avoiding late pulling of onions will cause damage to roots and tubers. Spray regularly, especially in bad weather. While growing purple onions often appear major pests such as omnivorous worms, green worms, onion flies (onion borer maggots) … need to spray insecticides alternately with microbiological drugs, to prevent reaching effective. In the period of 55 to 60 days, the tubers turn red, the leaves have fallen 80%, then start pulling, usually 2 to 3 days in the sun to soften the leaves for easy transportation. Onions should be harvested only on dry days. Pull out the tubers to keep the soil clean, put them in a basket and transfer to a place of storage, to avoid scratching or crushing the outer skin, which will affect the storage period. For onions produced in February and March of the solar calendar, to keep as seeds, harvest 40 to 45 days after planting (old bulbs stop growing so they can be damaged for a long time). How to preserve: sun-dried for 10 to 15 days, the straw is really dry, must be free of pests and diseases, piled high, covered with a layer of straw for every layer of onion, the straw is in the open air, or hangs a bunch of onions in a well-ventilated place .