Pollution-free cultivation techniques of spring spinach

The growing period of spring spinach is relatively short, and it can be harvested and listed 30-50 days after sowing. Planting spring spinach plays an important role in quickly relieving spring dullness. 1. After the selection of suitable varieties of spring spinach after sowing and emergence, the temperature is low, the sunshine is gradually lengthened, and it is very easy to bolt through stage development. Therefore, varieties with late bolting, hypertrophic leaves, high yield and good quality should be selected. Such as late round leaf, spring and autumn big leaves, Liaoning round leaf spinach and so on. two。 Select the land and make the bed in the base that meets the conditions for the growth of pollution-free vegetables, select the neutral slightly acidic soil with gout sunny, fertile and loose, refreshing water, and turn the vegetable soil deeply after the previous harvest to remove the residual roots. When preparing the soil, 30004000kg of rotten organic fertilizer is applied every 666.7 square meters, and the border soil is leveled and made into a narrow, slightly deep ditch to facilitate drainage on rainy days. The general width of the bed is about 1.2 meters. In order to prevent Rain Water from drenching the wet soil, the border soil should be covered with a film before sowing to facilitate sowing. 3. Suitable time for sowing and Seedling Spring spinach can begin to sow when the temperature rises above 5 ℃ after the beginning of spring. Generally, there is no need to sow bud seeds, but both dry and wet seeds can be sowed. There is no need to pour bottom water before sowing, but should choose to sprinkle a layer of rotten thick dung residue or cover soil about 2 cm after sowing on the fine border soil on a sunny morning. The sowing rate is 4-5 kg per 666.7 square meters. 4. Cultivation and management of spring spinach sowing when the temperature is low, the early covered with plastic film, can be directly covered on the border, can also be covered with a small arch shed, which is conducive to heat preservation and promote early emergence. When covering directly, remove the film or change to a small arch shed after the emergence of spinach seedlings. And let the spinach seedlings see more light and refine the seedlings. Pay attention to the cover of the small arch shed at day and night, and the cover of rain and sunshine. Choose sunny day and time to pull out the dense seedlings, and apply fertilizer and water in time according to the weather and seedling conditions. In the early stage, the mature human and animal manure was applied lightly and frequently, and in the later stage, especially 15 days before harvest, the application of human and animal manure should be stopped, and the available nitrogen fertilizer should be applied instead. Sufficient nitrogen fertilizer and vigorous leaf growth can delay bolting, which is beneficial to the improvement of yield and quality. However, attention should be paid to controlling the amount of nitrogen fertilizer so as to avoid excessive nitrate accumulation in leaves. In the middle and later stage of the growth of spring spinach, diseases and insect pests are easy to occur due to the increase of temperature. The main diseases and insect pests are aphids, hidden leaf rope and downy mildew, which should be prevented and controlled in time. 5. The harvest of spring spinach should be timely harvested and listed according to the growth situation and market demand. Generally speaking, it should be harvested in time before bolting to ensure quality and merchandise. It is usually harvested 30-50 days after sowing.