Acidic soils cause dry-neutral neutral soils suitable for the growth of Welsh onion, with a pH of 7-7.4 being optimal. When the application of organic fertilizer is less, the application of ammonium sulfate and superphosphate will cause acidification of the soil, causing the onion leaves to be weak and the outer leaves to be yellow. Prevention and control measures: Apply enough organic fertilizer per mu and apply 150 kg of calcium oxide.
Drought causes soil drought during the production of dried scallions, and plant water deficiency can cause dry tips. Prevention and control measures: According to the different needs of the different growth periods of onion water, timely, adequate watering. Appropriate control of water at seedling stage, no irrigation, no pouring, 15 to 20 days watering once; vegetative growth period combined with topdressing, earthing timely watering to ensure adequate water supply, so that the field of water holding capacity at 70% -80%; Control the watering in the first 10-15 days so that the field capacity can be kept at 60%-70%
The lack of trace elements caused dry tipping and lack of calcium in the leaves of the heart, physiological resistance, lack of magnesium outer leaves yellowing. Prevention and control measures: The topdressing can be supplemented, such as 0.1%-0.3% calcium nitrate, 0.1% magnesium chloride spray.
The growth temperature range of dry shallot caused by high temperature and frost damage is 7°C-35°C. When the temperature exceeds 35°C, the tip is dry and below 7°C, the tips of leaves are whitened after being chilled at low temperature. Prevention and control measures: For the onion cultivation of green onions pay attention to water cooling; greenhouse cultivation to strengthen the ventilation, to prevent the emergence of high temperatures above 30 °C, to strengthen the insulation, so that the minimum temperature of not less than 7 °C.
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