The method of raising Cotton Seedling in Nutrition Bowl and moving Seedling

Moving bowls and squatting seedlings is an important measure in cotton seedling bed management. One of its main advantages is that it can break off the top of the main root of cotton seedling to make the upper part grow slowly, stimulate the development of lateral root, make the plant short stem and thick lateral root, and improve the quality of cotton seedling; second, after moving the bowl, the root is ventilated and the water is lost quickly, which can not only enhance the root activity, but also reduce the infection of pathogen and effectively control the disease of seedling bed. Third, after squatting seedlings, the growth of cotton seedlings is robust and the lateral roots are well developed, which can shorten the slow seedling period after transplanting and speed up the growth process. According to the investigation, the living stage of moving seedlings was 7 days earlier, the budding stage was 12 days earlier, and the flowering stage was 8 days earlier than that without moving seedlings. The methods and matters needing attention of moving bowls and squatting seedlings are introduced as follows. The main results are as follows: 1. According to the study, 2 leaves and 1 heart of cotton is the time when the flower bud differentiation of mid-mature varieties is about to begin. At this time, squatting seedlings can promote up and down control, first control and then promote, improve the quality of cotton seedlings, promote the role of early hair. If you move the bowl when the leaves are flat, it will restrict the growth of cotyledons and roots, affect the early development of strong seedlings, and show that the node height of the first fruit branch, plant height and leaf area per plant decreases, and the yield decreases. If the bowl is moved too late, because the time from transplanting is short, cotton seedlings have to be transplanted before they are alive, which will cause continuous squatting seedlings and prolong the seedling stage in the field. 2. The seedling bowl should be reasonable for raising seedlings with general film, the temperature of the layman is low, and the seedlings are weak. When moving the bowl, the seedlings should be rearranged according to the classification of large and small seedlings, and the small seedlings should be placed in the middle of the row, and the large seedlings should be arranged amateurishly, and then managed by heat preservation, so that the small seedlings can catch up with the big seedlings and promote balanced growth. After moving the bowl, the seedling bowl should be arranged sparsely. 3. The management after relocation should do a good job in the management of replenishing soil, fertilizing, water and warming after the seedling bowl is moved. After the seedling bowl is discharged, the fine soil is added to fill the gap between the bowl and the bedside, so that the bowl does not see the gap, the bowl body is not exposed, and the soil is plugged by the bed. After replenishing soil combined with replenishing water, 2000 kg of clear water dung was sprinkled on every 667m 2 seedling bed to promote the growth of cotton seedlings. After the bowl is moved, the temperature of the seedling bed should be controlled between 20 and 25 ℃. 4. In order to choose the day to move the squatting seedlings, the squatting seedlings should be carried out on a sunny day when the temperature outside the film is stable at 18 ℃, so as to prevent the attack of low temperature and strong wind. At the same time, attention should also be paid to the harm of high temperature. before removing the film, the temperature inside and outside the seedling bed should be ventilated to avoid excessive temperature difference and wilting leaves of cotton seedlings.