How to identify onion seeds
Onions mainly include onions, scallions, leeks, and leek. The appearance of seeds is similar. Different varieties need to be strictly differentiated during production to avoid loss.
The seed coat of the onion seed was black and shiny. The seed coat of the onion seed was dark red and dull. The onion seed had a thick root with a slight yellow color. The green onion had a fine and pure white root.
How to choose onion varieties
In China, the main application is local farm breeds, which should be introduced according to the local climate conditions. The main selection is based on the local consumption habits, sunshine hours, bulb color, storage, yield, and the degree of bolting in advance.
How to determine the time of sowing
The choice of whether or not to sow in the sowing time is extremely important for the yield and quality of the onion. Onions are chloroplast vernalized crops. Bulb expansion is controlled by the number of hours of light exposure. If the seedlings are too large, the temperature will increase through the vernalization in case of low temperatures. The leach year will increase the bolting rate and affect the yield. On the contrary, the seedlings are too small to reach the sunshine hours. The body is small, it will be difficult to grow into a big ball. It can be seen that the determination of onion sowing time is related to climate conditions, time of planting, cultivation measures and species characteristics.
How to determine the seed germination rate
The lifespan of onion seeds is extremely short, with the highest seed germination rate in the current year, and decreases at a rate of 20% each year thereafter. Generally, seeds in the third year cannot be used. When the new seeds were rinsed with fresh water and the seeds were removed, the germination rate could reach more than 90%. The method for determining the dental rate of onion seeds is: take 3 seeds prepared, 100 grains each, soak them with cold water (20°C) for 10-12 hours, wrap them with gauze, and put them in bowls or tea jars. , Overlying the wet towel, germination between 20°C and 25°C. Wash 1-2 times a day, throw away water after panning, germinate 5-7 days, detect germinated seeds, and count the number. The number of survey days was 10 days. The average of the three calculations was the germination rate of the seeds.
How to determine the amount of fertilizer at seedling stage
Fertilization at the seedling stage is the key to nurturing strong seedlings. If the fertilizer supply is insufficient or unbalanced during the seedling stage, it will seriously affect the quality of seedlings and cause irreparable damage to production. Application of farmyard manure, supplemented with a small amount of other inorganic fertilizers, can basically meet the growth needs of the seedlings. If only inorganic fertilizers are applied, attention must be paid to the fertilizer ratio. According to the study, the amount of fertilizer needed for onion seedlings needs to be: 10.13 kg-11.2 kg of total nitrogen (N), 8.1 kg-11.6 kg of phosphorus, and 5.9 kg-11.4 kg of potassium. The general principle is to fertilize as appropriate based on soil fertility.
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