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Onion seeding method
Onion seed retention methods include hybrid seed production and conventional seed retention. At present, we generally use the conventional method of seed retention. It takes longer time for the onion to remain planted. It takes more than two years for the seeds to be harvested. The seedlings are planted in the first year of the fall, the onion seed is planted in the fall of the second year, and the seeds are harvested in the third summer. The flowering period is also worth the rainy season, which often leads to poor pollination and the seed setting rate is not high. Therefore, in the cultivation and seed-retention techniques, attention must be paid to the following five technical steps: 1. Strict selection of the onion seed (bulb). Selection of pure plant type, high false stem, medium thickness, thick green leaves, vigorous growth, rapid onion enlargement, thicker bulbs, smooth bulbs of the bulbs, onion bulbs (bulbs) with this variety and pest free Kind of green onion. Cracked onion balls, coarse stems, onions, and depressions around the neck are perishable and should not be left for bulbs. When the onions on the lower part of the 1-2 leaves yellow, pseudo-stem softened, the ground part began to fall, the outer scales of the bulb dry, select the sunny, uprooted plant strains, the implementation of a single income, single dry, single hung. 2, choose a good breeding place. It is advisable to choose a sandy loam with a high topography in the planting area, with a flat land, fertile soil, and convenient drainage and irrigation. At the same time, onion is a cross-pollination plant for insects and wind pollination, attention should be paid to segregation between species, and can not be adjacent to the onion production field, in order to avoid pollination mutation and the spread of pests and diseases. Before the next kind of planting, we must deepen the soil and apply more manure and phosphorus and potassium fertilizers. 3, timely planting onion species. There are two kinds of bulbs planted in autumn and spring. The spring is planted in the "mountain" to "summer" and the autumn season is better before and after the "equinox." Plant spacing 16 cm 23 cm. At the same time, it should be slightly deeper when planting onions. 4, fine management. First, after planting, water sufficient seedlings, wintering water, and green water to keep the soil moist. And give good green, flower stems, flower balls three times fat. The second is cultivating grass, loosing soil, keeping seedlings, and preventing pests and weeds. The third is to use pruning and artificial pollination. The onion root system is shallow, and the growth of the seed strains is not stable. It is easily blown by the wind and affects pollination. Therefore, it is necessary to straddle and prevent lodging before and after flowering. After pruning, pruning should be carried out after the flowering, and the thin and thinly growing flower moss should be removed in batches, leaving only 5.6 plants per plant to facilitate the concentration of nutrients, which will help the seeds to be full and full. At the same time, onion pollen has poor moisture resistance, and the flowering season coincides with the rainy season. Therefore, artificially assisted pollination can increase seed-setting rate and increase seed yield. 5. Collect seeds in time. In the autumn, the plants were planted before and after the "great heat". The spring planting of onions plucked seeds before and after the "summer heat." When a few of the pods on the top of the flower buds turn yellow to reveal black seeds, after the batches are dehydrated in batches, the flowers are cut off at 33 centimeters from the flower moss, and then every 7-10 flower balls are tied into a bundle and hang upside down on the roof. Under (prevent exposure) after ripening. After drying for several days, the seeds shall be soaked, dried and then properly packaged and stored with moisture-proof material to prevent the seeds from mixing, smoke, insects, moisture, and mildew. When the amount of seed is large and cannot be left to dry, the curd cool must be prevented from being too thick (not more than 20 cm) so that it is gradually cool and dry, and should not be dried. China Agricultural Network Editor