In the vast northern regions of China, most green onions are planted in autumn sowing in summer, and winter is the quality product - Welsh onion. Warm southern areas can be sowed in spring or autumn and harvested in winter. This cultivation method has high yield, good quality, and strong storage stability. 1 to cultivate strong seedlings: Onion seedlings suitable effective growth time is 80 to 90 days, in order to achieve the standard of colonization. Choose strong varieties with strong resistance and good commercial quality, such as Zhangqiu Onion Series, Gaojiabai, Huaxian Gulei, Sanyeqi, Japanese onion and so on. Seeds germinated by soaking seeds and seedlings on seedbeds. Control temperature and humidity, strengthen fertilizer and water management, and safely overwinter. In the spring of the following spring, when the shallot grows to three leaves before the Valley of the Valley, it is appropriate to plant the seedlings in time. After the seedlings are watered, fertilizer is applied in a timely manner. The first time the fertilizer is applied in late April, combined with watering, 150 kg/ha of urea can be topdressed. Note that it is not possible to use ammonium bicarbonate for top dressing so as not to burn the onion leaves. After every 7 to 10 days, pour 1 water, pour 2 times of water and apply 1 fertilizer, and the onslaught will rush. Each application of urea is 200-300 kg/ha. In the middle of May, the garden will be transplanted and planted. The spring sowing seedlings were watered and fertilized for the first time from the end of April. Each application of urea was 150 kg/ha, or the decomposed feces and urine fertilizer was 4,500 to 7,500 kg/ha. Rear-viewing green onions grows to 300 kg/ha. After pouring water once every 10 days, it is necessary to stop watering and fertilizing in the first half of June to carry out seedlings, hardening seedlings, increase the fiber of onion leaves, and enhance wind resistance and disease resistance. After 20 to 25 days of seedling hardening, the seedlings can be fertilized and watered 10 days before planting. This fertilizer is a good foundation for transplanting and returning green, also known as “married†fertilizer. To strengthen the disease prevention ability of onion seedlings, foliar spray water solution can be used to supplement potassium fertilizer. 110 kg grass ash per hectare is dissolved in 225 kg water, filtrate is applied to water 2250 kg, and foliar spray is applied once every 7 days. Spray 2 or 3 times. It can also be sprayed with 0.2% potassium dihydrogen phosphate solution, which makes the growth of onion seedling strong, and the ability to resist diseases and wind. 2 re-base fertilizer, timely planting: production practice shows that fine soil preparation, planting early spring onions, is the basis for high yield. Whether it is autumn seedlings or spring seedlings, they must be planted in the early ground and transplanted. Before the rainy season and high temperatures, the planting seedlings will turn green and the roots will develop well. To choose a plot that has not been planted with onions and garlic within three years, remove the remaining crops from the former crops and then deepen the cultivation. In deep plowing, decomposed organic fertilizer can be sprinkled on the ground and mixed with the soil after deep plowing. General basal fertilization applies 35,000 to 50,000 kilograms per hectare of organic fertilizer, 1,500 kilograms per hectare of plant ash, and 375 kilograms per hectare of superphosphate. Shi Jian Fei shallowly overturned again, and made it flat or north-south to planting ditch. When the underground pests are serious, it is best to use biological pesticides to kill insects. When the onion seedlings are planted, the standard is: the average weight of a single plant is about 40 grams, about 50 centimeters high, about 25 centimeters long and light blue, about 1 centimeter thick and light green, and the dark green color of the tubular leaves, each of which is not less than 5 to 6 pieces. The typical traits of this species. After planting, the seedlings will not be watered or top-dressed during the slower summer, but only shallow cultivator, more loose soil, and timely repelling grass to improve the ventilation of the soil. Onion has a long growing period and requires more fertilizer, timely dressing is an important measure for high yield and quality. In the early stage of onion growth, after the onset of hot summer, the weather turns cold and the plant growth gradually accelerates. It is necessary to chase the leaf fertilizer once, apply 225-300 kg/ha of compound fertilizer or 225 kg/ha of urea and potassium sulfate, or 150,000 of decomposed organic fertilizer. ~ 22,500 kg/ha, fertilizer applied to the ditch, mixed with cultivators, dipped in the ditch, and then watered, can meet the needs of the blade to increase production and increase in time. In early September, it is the appropriate temperature period for scallion growth, and the light blue rice has entered its peak period of growth, which is the fastest time for yield formation. At this point the green onions need fertilizer, should be attacking tree fat. The topdressing amount should be equal to or slightly more than the first topdressing amount. After top-dressing, it should be bred on both sides of the onion to make the original ridge back into a ridge, and timely watering to meet the needs of rapid growth of onions. From late September to early October, it is a time when the photosynthetic product of the onion accelerates the storage and the production of light blue rice is significantly increased, and it is also the peak period of the fertilizer needed before the product is formed. In the main lush regions of Shandong, onions and wheat are intercropping. At this time, when the wheat is sown, in order for the wheat to have sufficient basal fertilizer, topdressing should be repeated once. Generally, 60,000 to 75,000 kg/ha of organic fertilizer is applied and 375 kg/ha of compound fertilizer or 100 to 150 kg/ha of urea, superphosphate, and potassium sulfate are added. This fertilizer has the dual role of ensuring the high quality and high yield of onion and interplanting wheat. After entering October, due to adequate fertilizer, the number of leaves and leaf area have increased to the top, so no top dressing is needed. Source: Guangdong Province Mountain Information Network
The fundamental reason why leather is soft is that when leather is made, oil is introduced into the interior of animal skin to form an oil film that completely covers the surface of the fibers inside the skin, that is, a layer of oil film with appropriate thickness is used to separate the surface of the fibers inside the skin. In this way, the friction between the fibers inside the leather is equivalent to the friction of the oil molecules, so the leather will be very soft. Its principle is similar to that of sponge, but the difference is that the inner surface fibers of dermis are separated by oil film, which makes the inner surface of dermis have sliding pores, but its pores are smaller than that of sponge, and the distribution of the inner surface fibers of dermis is not as regular as that of sponge.
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