What should I pay attention to when growing onions?

Let's talk about the planting standards of onions first. The soil is suitable for planting in the soil with PH7.5, and the fertility regulation activity before seedling is loose and the low-lying land is rich. In the budding stage, the bottom soil should be prevented from caking, and the seedlings should be fertilized once under the condition of gradual and rapid growth and development. Before planting, the soil moisture should be controlled at 10- 15 days to avoid being steep and long. Onion likes fertilizer, which stipulates the balanced use of oxygen, phosphorus and potassium. Moreover, the regulations on oxygen fertilizer in the early stage of growth and development are not very high, and more phosphorus and potassium fertilizers are needed in the middle and late stage. Pay special attention to the use of phosphorus and potassium fertilizer, because the lack of phosphorus and potassium fertilizer will cause poor plant growth. The output has decreased. At the same time, we should pay attention to the composition of sulfur in onion field, and the lack of sulfur in soil will endanger the actual effect of high yield.

The drought resistance of green onions is very high, not only resistant to low temperature, but also resistant to high temperature. Although temperature is generally harmless to the growth and development of garlic, a suitable temperature standard is beneficial to the quality and yield increase of garlic. Welsh onion has little root hair and poor ability to absorb water and fertilizer. Most of its rhizomes are all over the soil surface, which is wet, so it requires high soil humidity, but the rhizomes are worried about waterlogging, and high temperature and low temperature are easy to lead to the death of rhizomes. The compressive strength of scallion to sunlight should be moderate. Because the cylindrical leaves of green onions will still get excellent sunshine standards under the standard of sparse planting, not necessarily strong sunshine. Strong sunlight will do harm to the growth and development of green onions, leading to embrittlement of leaves, improvement of chemical fiber, lower quality and even loss of wearing value.

In early spring, it can be used as a plant after the soil is thawed, and it can be used as a supply of green onions before the hot summer comes. In other words, it was originally used as dried onion after planting, in other words, as a supply of furrow onion, it can be used as a seed plant of hornbeam onion in winter. In the summer planting time, planting is mostly carried out from the middle and late July to the middle and early August, so it is called Fu Cong. The main stem is very big in early winter, which is easy to carry out the whole vernalization process. In the second spring, it germinated early and blossomed ten pieces, which were usually sold after the onions were picked.

If a large amount of organic fertilizer is applied, a small amount of potassium fertilizer can be increased, especially the amount of oxygen fertilizer should be moderate and balanced with the corresponding potassium fertilizer, so as to achieve excellent practical effects of high yield. Otherwise, blindly following the trend to use organic chemical oxygen fertilizer will not only have no benefit to increase the yield of green onions, but also lead to a decline in the quality of green onions, such as a decrease in the proportion of onion roots, more leaves, and a weaker or even a little onion flavor.