Green onions are more common crops. They are widely planted in China, and many growers rely on planting it to make money. So how to make green onions white and high quality? The following small series will tell you in detail about the four kinds of scientific techniques for planting green onions.
    First, scientific planting
    The way the green onions are planted directly determines the erect whiteness and the length of the scallion. When planting seedlings, on the one hand, we must first set up caves, and keep the seedlings upright, and do not slant obliquely planting seeds. On the other hand, we must pay attention to the depth of planting. It should not be planted too shallow or the scallion is short, and it should not be planted too deep. Otherwise, The seedlings are slower, and the depth is not best buried in the green onion. As the saying goes, "deep green onions, shallow garlic" is such a truth.
    In addition, it is best to adopt the method of planting north and south ridges when planting, which is more conducive to more and more uniform illumination of green onions.
    Second, the application of fertilizer
    Fertilizer is the overall growth of the green onion plant. If the fertilizer is insufficient, it will make the scallion short, the hardness is not enough, the yield is low, and the quality is poor.
Fertilization should be based on decomposed organic fertilizer and supplemented by chemical fertilizers. Rational use of nitrogen fertilizer and application of phosphorus and potassium fertilizer. On the basis of the application of the base fertilizer, the top dressing is carried out in time.
When the seedlings grow vigorously, ordinary plots can apply 1500 kg of organic fertilizer + 20 kg of superphosphate per acre, and the plots with higher soil fertility and fertility can be used to apply 750 kg of manure per acre or to apply grass ash 100. Kg + 20 mg of superphosphate + 30 kg of ammonium humate to promote accelerated growth of onion leaves.
In the critical period of white stalks after the white dew, at this time, watering can be combined with the application of quick-acting nitrogen fertilizer + potassium sulfate per acre to promote the rapid growth of scallion.
    Third, reasonable watering
    The watering of the shallots should be carried out flexibly according to the weather conditions, the dry and wet conditions of the soil and the cultivating conditions.
    In the late summer and early autumn, watering should minimize the amount of watering, and do the drainage and drainage after the rainy season, in order to prevent the roots, rotten roots and dead seedlings from appearing on the green onions;
During the period from Liqiu to Bailu, you can pour small water in the morning and evening. After Bailu, you can water it once every 5 days, increase the amount of watering and the number of watering. After the frost, you should control the pouring. The amount of water, reduce the number of watering, as long as the soil is kept moist;
    Before the green onion enters the harvest, it should stop watering a week or so in advance to prevent the onion white water from being too large and not to be stored after harvest.
    Fourth, many times to cultivate soil
The length of the scallion is determined by the number of times the soil is cultivated. Generally, it is carried out from the beginning of autumn to the harvest, which can prevent the onion from bending and lodging, and promote the growth of scallion. When soil cultivation, it must not let the soil bury the green onion.
    1. Three key periods of green onion cultivation:
    The first step: when the plant height of the green onion is about 30 cm, the first soil is cultivated, and the thickness of the soil is about 5 cm;
    The second step: when the plant height of the green onion is about 40 cm, the second soil is cultivated, and the thickness of the soil is about 10 cm;
    The third step: 20 days before harvesting the green onion, the third time the soil is cultivated, and the thickness of the soil is about 10 cm.
    2, green onions and soil considerations:
    1 soiling time: should be selected in the evening, when the onion leaves are not easy to break;
    2 height of soil: it is better not to bury new leaves and soil does not exceed green onion;
    3 method of soil cultivation: when cultivating soil, let the onion stems stand upright, only sell leaf sheaths, not to embed leaves, otherwise it will make the green onions grow long and curved;
    4 Other matters: The green onion can be combined with cultivating twice before the soil is cultivated. When the soil is cultivated, the soil should not be taken too deep or too wide to avoid root injury and disease.
    Green onions are foods that people often eat in their lives, and their cultivation value is high, especially in the northern market of China. However, in the planting process, all growers need to pay attention to the planting skills, otherwise the green onions grown will be short and curved. The above are four kinds of green onion white yielding scientific planting techniques, you can learn from.
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