High-quality cotton needs reasonable growth space
The planting density of cotton is often changed due to changes in the selection of species and the level of cultivation and management. In the 1970s and 1980s, more than 90% of China's main cotton-producing areas were covered by conventional cotton varieties. The planting density per mu was 3,000 to 4,000. Later, with the accelerated application of the transplanting technology of the nutrition seedlings and the expansion of new varieties of hybrid cotton, the planting density of cotton gradually decreased. However, due to different planting methods of different households, the level of fertilization is high or low, and there is a big difference in the density layout of cotton fields. Some 1300-1500 strains are planted in each mu of cotton fields and some are planted in 1800-2000 strains. Some wide and narrow rows of dense planting, and some wide rows of planting. Some ecological effects are very good. Cotton has high and stable yields, and its quality is good. Some ecological effects are poor, and cotton production is reduced. The quality is worrying.
According to the author's many years of investigation, the cultivation of hybrid cotton, especially the cultivation of hybrid insect-resistant cotton, if the planting method is unreasonable and the density is too large, will often bring about many negative impacts: First, increasing the labor cost when transplanting cotton, especially cotton fields Larger farmers are not worthwhile. Second, excessive investment in fertilizers and pesticides. Third, it is not convenient for field operation and management, and it is not conducive to cultivating soil in the middle of cultivation. When a gale is encountered, it is easy to cause lodging of cotton plants. Fourth, cotton is often too early to be closed, shaded cotton fields, poor ventilation and light transmission, resulting in a large number of flower buds fall off, affecting the early cotton on the peach. Fifth, in late August and early September, when continuous high temperature and rainy weather suffered, the loss of cotton rot was extremely heavy.
Therefore, in order for good cotton varieties to achieve high quality and high yields, it is necessary to create a reasonable living space for the growth and development of cotton, so that the upper, middle, and lower parts of the cotton plant have a reasonable layout, which not only exerts the advantages of individual plants, but also reflects the cotton population. effect. The following points should be mastered in technical operations.
The reform of planting methods advocates the cultivation of a wheat and two flowers, that is, sowing wheat or rapeseed or broad bean in the middle of the carriage. Each row of cotton is on both sides of the carriage. The width of the carriage is 2 meters, and the maximum is 2.4 meters. This way of planting is conducive to field management, is conducive to air and light, is conducive to irrigation and lowering the groundwater level, is conducive to uniform peach.
Properly arrange the density per mu, about 1,300 cotton fields with good fertility, and about 1,500 cotton fields with moderate fertility. Conventional cotton has 1500-1600 strains of fertile cotton fields, 1,700-1800 strains of medium-fertilizer cotton fields, and about 2,000 poor fertility. In particular, it should be emphasized that the average row spacing of hybrid cotton should not be less than 1 meter, and the spacing between the plants should be flexible.
Shaping the ideal plant-shaped high-yield cotton fields is relatively adequate, with little care in management, prone to prosperous growth. For cotton to grow steadily, we must always pay attention to shaping the plant shape. That is, it is controlled by a delayed plant growth regulator. The regulators with good general effect are diarrhetine, melatonin, buds with 1 gram or 4 milliliters per acre, and 4-5 grams or 16-20 milliliters per acre after topping. To do a small number of times before and after light weight.
Blood Pressure Meter,Relion Blood Pressure Monitor,Boots Blood Pressure Monitor,Digital Blood Pressure Monitor
Shenzhen urion Technology Co., Ltd. , https://www.urionhealth.com