Onion has a wide adaptability to soil conditions and can be cultivated from sandy loam to clay loam. In sandy loam soil cultivation, light blue and white are rough and loose, and there are many layers of dry film outside, which are not crispy, tender and heavy, and are not resistant to storage and transportation. The welsh onion cultivated in the viscous soil is light and slender with low yield. Soils with loose soil, deep soil, strong permeability, and high fertility and water retention capacity can achieve high yields.
Onion requires neutral soil, pH7.0 is the most suitable for growth of Welsh onion. The range of pH that can be adapted is 5.9-7.4. When growing onions in acidic soil, lime should be used for soil improvement.
Onion continuum, the best 3-4 year interval rotation.
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