The rate of seedling formation after onion colonization has a great correlation with the level of yield. Low seedling rate or lack of seedlings will seriously affect yield.
(1) The reasons for lack of seedlings are too deep or too shallow; the soil preparation is not fine, and the roots of the seedlings after transplanting cannot connect well with the soil, resulting in vacancy and death; the autumn planting is too late, the root system fails to restore growth, and in winter, it suffers from low temperature and freezing damage. Dead; Onion seedlings are of inferior quality; Spring soil before planting is dry, and there is no rain after planting, and there is no irrigation condition, causing onion seedlings to dry up and die; too many weeds in the field, weeding is not timely, and weeds grow after being pulled out. Onion seedlings often brought out and lack of seedlings; soil salt and alkali too heavy, underground pest damage and unfrozen water before winter can cause seedling deficiency.
(2) Prevention of lack of seedlings
1 suitable for planting when the depth is too deep, unfavorable to slow seedlings, too easy to hang dry seedlings, generally planted 2-3 cm deep, when the seedlings hand-seedlings around the cover soil according to the actual, but do not exert too much to prevent injury to seedlings After planting, suppress watering and connect the roots.
2 The site preparation must be fine, the squeezing should be done carefully, and then the hoeing should be done. If the soil is dry before the smashing, it is necessary to irrigate the water first and then dry the sorghum seedlings when it is half dry. If the soil is dry when the seedlings are not filled with water, they should be planted with water. In this way, drought is prevented on the one hand, and onion on the other hand is in close contact with the soil, which is conducive to slow seedlings.
3 Areas where autumn plants are planted should be planted in a timely manner, usually about 40 days before the arrival of severe cold. Planting too early before the winter brings about excessive growth of the seedlings, and the second year will cause premature bolting; the colonization is too late and the roots of the seedlings before winter have not been restored. In the second year, it is easy to lose seedlings.
4 Strengthen the wintering management of seedlings, so that they are neither cold nor hot and improve the survival rate of planting.
5 Strictly selecting and grading seedlings, regardless of autumn or spring planting, strict selection of seedlings before planting, elimination of diseased seedlings, dwarfing seedlings, leggy seedlings, seedlings, seedlings, convulsions against seedlings, weak seedlings and frostbite thermal seedlings.
6 Select sandy soil lands with fertile soil and rich organic matter to avoid planting in saline soils.
7 During the entire growth period, underground pests such as mantle and earthworms should be prevented in time to remove weeds as soon as possible.
8 Autumn planting needs to master frozen water and cover. Frozen water can not be poured too early or too late. It is better to freeze the soil and freeze the soil. Watering should choose sunny days, when the temperature is high at noon, water to prevent freezing seedlings. The amount of frozen water must not be excessive, and all water seeps into the soil without cumulation and freezing. In areas that are relatively cold in winter, use horse dung, compost, straw, etc. to cover the cold in time.
9 It is best to use mulching to increase the survival rate. Whether the spring or autumn planting, the use of mulching can prevent the lack of seedlings, improve seedling maintenance. In addition, the cultivation of mulching film also increased the onion yield, and the onion was large and neat. Therefore, onion cultivation should be widely used mulching.
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