How to do field management of green onion planting?

[Network] produce large onion planting field management how to do? In general can be divided into two categories, one is internal, internal factors are the difference between the varieties of large onion itself, as well as the growth habits of life to decide. External causes are caused by external conditions such as climate, soil, and fertilizer.

1. Water management: Do not pour in July. Drain in time after the rain. In the first half of August, the water was poured in the night. From late August to the end of September, combine the cultivating and topdressing to keep the fields moist. In October, the “salt water” should be continuously poured 3-4 times, and the water holding capacity in the field should be kept above 70%.

2, soil management: combined with topdressing, 4-5 times in the field soil management. In the first ten days of August, the ridge was broken, and the purpose was to chase the grass and ventilate the roots. Don't prematurely cultivate the soil too much. Flat ridge in late August. Use a small plate to loosen the soil and flatten it. The purpose is to breathe and topdress. In the first ten days of September, it was surrounded by "heads." In the end of September, the "two squats".

3, the Application Management: the beginning of autumn, chicken manure 1-2 square mu topdressing. In late August, early September and late September, 20 kg of urea and 15 kg of potassium sulfate were applied. Appropriate application of potassium sulfate in the potassium-deficient plot.