Abnormal growth of onions can lead to poor sales, while poor sales can affect sales of onions. Therefore, attention should be paid to the situation of abnormal growth of onions. Early resolution of onions, abnormal growth of onions, climate, seed selection, and nutrition Imbalance, pests and diseases and other reasons, the following for everyone to analyze in detail how these causes onion
1, the main reason for abnormal growth of onions
1.1 Climatic reasons Onion is a typical seedling vernalization type biennial plant. When the seedling grows up to a certain size (the stem diameter reaches 0.7cm or so, it enters the critical period of feeling the influence of low temperature) can react to the low temperature, if present Cold air intrusion or low temperature will cause the vegetative growth of seedlings to turn to reproductive growth. If the low temperature is too long, vernalization will occur and convulsions and flowers will bloom. If the temperature is low, incomplete vernalization will result in abnormality of scale buds. Differentiation. The phenomenon of "twins" or "multiple births" occurs. For example, in 1998, the onion production area in Huaguoshan, Xinjiang was due to the low temperature and high rainfall, coupled with the abnormal growth of cold air intrusion and almost no harvest.
1.2 Causes of Seeds Because of the differences in the environmental conditions of the place of origin and the place of introduction, the seeds of different places have different responses to the low temperatures and length of sunshine in the introduced regions. They often show that the species with weak winter is sensitive to low temperature, and the seedlings encounter low temperatures. Convulsions occur; seedlings with strong winter cultivars can experience low temperatures and convulsions and flowering, and there is no strong local seed adaptability.
1.3 Improper sowing date Onion belongs to the chloroplast vernalization type plant. If the seeding is too early, the seedling age is too long and the seedling is too large. It is beyond the critical size necessary for vernalization vernalization, and it is prone to vernalization or incomplete vernalization. Causes abnormal bulb growth.
1.4 Irrigation with malnutrition is too much. Excess nitrogenous fertilizer will cause excessive seedlings and delay or inhibit the formation of bulbs. In the cold season, there will be convulsions and flowering, nitrogen deficiency, soil drought, resulting in seedlings growing too weak, carbon in plants. The ratio of compound to nitrogen increased, leading to early reproductive growth and convulsions and flowering.
1.5 Mantle Hazards Harmful to mantle, resulting in weak onion growth and delayed bulb growth.
1.6 Planting depth Planting process often occurs too deep or too shallow and bulb growth and development are poor. Planting too deep appears overgrown leaves, thickened bulbs, bulbs are too small and deformable; planting is too shallow, the plants are prone to lodging, the bulbs are exposed, and the sun becomes green and chapped.
2, onion growth abnormal solution
The purpose of onion cultivation is to obtain the bulbs of hypertrophy. The varieties suitable for the local sunshine and temperature conditions should be selected, and the appropriate sowing time should be grasped to increase the planting density so as to better prevent the occurrence of abnormal growth.
2.1 Strictly choose the best choice of varieties in the production of local fine varieties, if you need to introduce species, should be based on the variety of low temperature and length of the reaction of the sun, as far as possible to select the strict requirements of the low temperature of fine varieties. Ningxia red onion variety or local red onion is commonly used in the region.
2.2 Determine the appropriate sowing date The sowing time should be correctly determined according to the variety characteristics and climate characteristics. Autumn sowing in the Ili region is from late September to early October; spring sowing is from late March to early April.
2.3 Strengthening field management
1) Fertilizer management. Pay attention to the application of phosphorus and potassium fertilizers. Avoid excessive nitrogen fertilizer so as not to cause excessive overgrowth of the shoots and the occurrence of convulsions or delayed bulb expansion. Before spring sowing seedlings are excavated, the soil should be kept moist, ground watering, ground cultivating, and vigorous growth in the leaves. The expansion period of bulbs is the period when the onion is in need of fertilizer and water, and it should be fertilized and watered timely. 667 square meters are topped with 15 kg of diammonium phosphate, 20 kg of diammonium phosphate and 3-5.5 kg of potassium sulfate.
2) Pest control. The main prevention and control of mantle damage, can be used dimethoate and dichlorvos watered with irrigation, the use of raw manure as a fertilizer is prohibited, because the mantle has a tendency towards raw manure, it is appropriate to use fully decomposed organic fertilizer, uniform deep, separated seeds and fertilizer. The plots where the mantle has occurred must be ground-fed and can be flooded if necessary. However, irrigation should be coordinated with onion growth. Chemical control: 50% dimethoate 1000 times or 80% dichlorvos EC 1000 times with water.
2.4 Appropriate planting depth For planting and transplanting onions, attention should be paid to the planting depth. After the planting, the cover soil can bury the bulbs, and after watering, the bulbs should not be floated.
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