How should field management be carried out during the growing period of Welsh onions?
How should Welsh onions be managed during cultivation? Please give guidance. When the plants begin to grow faster, apply a "leaf-promoting fertilizer" as a top dressing, applying 1500-2000 kg of decomposed farmyard manure and 20-25 kg of superphosphate per mu. If the soil fertility is relatively high and the base fertilizer is sufficient, this top dressing can be appropriately postponed, and the fertilizer can be changed to 750 kg of human excrement and urine...
How should Welsh onions be managed during cultivation? Please give guidance
Fertilization: When the plants begin to grow faster, apply a "leaf-promoting fertilizer" as a top dressing, applying 1500-2000 kg of decomposed farmyard manure and 20-25 kg of superphosphate per mu. If the soil fertility is relatively high and the base fertilizer is sufficient, this top dressing can be appropriately postponed, and the fertilizer can be changed to 750 kg of human excrement and urine, or 100 kg of plant ash, 30 kg of ammonium humate, and 30 kg of superphosphate broadcast applied. After fertilizing, combine with deep hoeing, carry out earthing up, and water immediately. After the White Dew solar term, Welsh onions enter the peak growth period of the blanched pseudostem, which is the key period for yield formation. In combination with watering, apply a "vigorous plant fertilizer" twice as a top dressing, each time applying 15-20 kg of urea and 10-15 kg of potassium sulfate per mu, applied between the rows, followed by shallow intertillage and then watering, so as to speed up the absorption and utilization of the fertilizer.
Watering: In late summer and early autumn, the focus of field management is to promote root growth. Watering should be done according to the weather. Apart from long periods of clear weather without rain, watering should generally be controlled, and after rain, drainage should be carried out to prevent waterlogging, so as to prevent root rot, yellow leaves, and dead seedlings. At the same time, strengthen intertillage to promote root growth. From the Start of Autumn to the White Dew solar term, the principle of light watering and watering in the morning and evening should be followed. After White Dew, Welsh onions enter the peak growth period, and the principle of frequent and heavy watering should be followed. Water once every 4-6 days. After the Frost's Descent solar term, the temperature drops, the Welsh onions are basically fully grown, and the water requirement decreases, so the soil should be kept moist. Stop watering 5-7 days before harvest to reduce the moisture content of the blanched pseudostem, which is beneficial for harvest and prolongs the storage period.
Earthing up: In combination with water and fertilizer management, scientific earthing up should also be carried out. Earthing up is an important measure for softening the leaf sheaths, preventing lodging, and improving the yield and quality of the blanched pseudostem. From the Start of Autumn to before harvest, generally earth up 3 times. The first two times are combined with intertillage, piling the ridge soil into the onion furrow, and after the End of Heat solar term, fill the furrow level. The height of each earthing up for Welsh onions should be determined according to the growth height of the false stem, 3-4 cm each time, piling soil up to the leaf exit of the uppermost leaf, and never burying the heart leaf, so as to prevent the leaves from rotting.
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