Onion, also known as onion, is a lily bulb edible bulb vegetable. It was determined that the water content per 8 g of onion was 88.3 g, protein 1.8 g, carbohydrate 8 g, vitamin C 8 mg, calcium 16 mg, and iron 0.72 mg. Onions contain volatile sulfur compounds that stimulate appetite.
Onions are two-year-old vegetables, and the length of the growth cycle varies depending on the cultivation area and the way of breeding. The onion cycle of onions is generally divided into two stages : vegetative growth and reproductive growth. From seed to vegetative stage onion flower bud differentiation, this period can be divided into germination, seedling stage, blooming, bulb swelling and Resting five times. Onion flower buds began to differentiate from pumping after flowering seed sprouts mature into reproductive stage, this period can be divided into flower bud differentiation stage, bolting flowering and seed formation stage. Among them, the leaf growth period and bulb expansion period are the maximum nutrient period.
Onions are suitable for cultivation in fertile, loose, water-preserving and fertility soils, and are also suitable for mild saline-alkali soils. Onion fertilization requires a high fertility of the soil . Generally, for every 1000 kg of onion produced, nitrogen is required to be 2 to 2.4 kg, phosphorus is 0.7 to 0.9 kg, and potassium is 3.7 to 4.1 kg. Onions have different requirements for nitrogen, phosphorus and potassium in different growth stages. Generally, more nitrogen is needed in the seedling stage, and more potassium is needed in the bulb expansion period .
According to the fertility characteristics and fertilizer characteristics of onions, the fertilization techniques are : 1. Base fertilizer. On the basis of applying enough organic fertilizer on the land mu topdressing card nitrophosphate days 35 to 40 kg. 2. Topdressing. Blooming leaf, acres topdressing Tianji licensing nitrate fertilizer from 15 to 20 kg. In the bulb expansion period, the mu is applied to the Tianji brand NPK fertilizer 20 to 25 kg.
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