Ingenious planting methods and points for attention of Onion

Onions should not be cropped with other onions and garlic vegetables, avoid continuous cropping. The crops before autumn planting are eggplant fruits, melons, legumes and early autumn vegetables; spring planting makes more use of winter fallow land. The root system of onion is shallow and small, and its absorptive capacity is weak, which requires intensive cultivation of soil. First, select seedlings and grade them. Before planting, it is necessary to do a good job in seedling selection and classification, eliminate diseased seedlings, dwarf seedlings, overgrown seedlings, branched seedlings and seedlings whose leaves are yellowing and grow too large, and select seedlings with well-developed roots and strong growth. It was planted according to the height of the seedling and the thickness of the base of the stem. Second, it should be planted in the right time. Onion planting time is divided into autumn planting and spring planting. Autumn planting is planted about 40 days before the severe cold, so that the root system has resumed growth before overwintering. Spring planting should be as early as possible and can be planted after the soil is thawed so as to strive for a longer growth period. Third, suitable for deep planting. Onion is suitable for shallow planting, when the planting is too deep, the leaves grow too much, which will thicken the part of the pseudostem and affect the bulb expansion. But when the planting is too shallow, it is easy to lodge after watering, affecting the slow seedling, and the plant is short, the bulb is formed earlier, at the same time, some bulbs are exposed, change color or crack after the sun, and reduce the quality. General planting depth to buried bulbs prevail, about 2 cm. Planting depth is related to planting period and soil texture. Spring planting should be shallow, autumn planting can be a little deeper. In the case of heavy and sticky soil, planting too deep will affect the expansion of the bulb and reduce the yield because of the soil resistance, so it is appropriate to plant it shallowly, while the sandy soil can be slightly deeper. Fourth, proper close planting. The onion plant is erect, and the effect of proper close planting is significant. Generally, the planting row spacing is 15 cm to 18 cm, and the plant spacing is 10 cm to 13 cm. 30,000 to 40,000 plants can be planted per mu (667 square meters). The planting density of red-skinned varieties should be lower than that of yellow-skinned varieties.