To improve the quality of onion products, it is critical to prevent “twins†early. The chance of "doubles" on onions is high, which seriously affects the value of commodities and should be prevented as soon as possible. The reasons for the occurrence of twins are: too early sowing, too large seedlings before winter; too much nitrogen fertilizer at seedling stage; warm winter, late spring and so on, all of which will cause secondary tillers at the seedling stage to form “twinsâ€. In addition, the growth point at the seedling stage suffers from insect pests; the burning of chemical fertilizers; human injury, etc., can also result in two childbirths. Poor seeds are also one of the factors in the occurrence of onion “twinsâ€.
Preventive measures: timely sowing, planting, seedling bulbs with a diameter of 3 to 0.8 cm is appropriate, too large and too small should be removed; seedling spraying timely new high-fat membrane to prevent bacterial infection, improve the ability of anti-natural disasters, improve photosynthetic Intensity of action to protect seedlings thrive. Appropriate application of nitrogen fertilizer, fertilizer application of nitrogen, phosphorus, potassium in conjunction with the application; timely prevention of ground tigers, golden needles, cockroaches, beet armyworm and other pests; when spreading fertilizers should pay attention not to spread as far as possible in the leaf sheath; management do not step injury seedlings.
If twins are found during the growth period, use one of the bamboo chips to remove one of them and keep one. Timely spraying general tree maintenance sterilizes and protects wounds from healing. After several days of wound healing, watering, topdressing, and spraying the fruit to reach the ground, so that the underground fruit nutrition transportation conduit thicker, increase the vitality of ground fruit expansion, smooth fruit surface, fruit type robust, high quality and high yield.
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