In recent years, Suqian City Academy of Agricultural Sciences carried out new production techniques such as cotton seedling transplanting, and other new production techniques. From the test results, the light and simple seedling raising techniques such as soilless seedlings, water floating seedlings, and plug-in substrate seedlings have become more mature and have undergone production practices. The simplified technique of seedlings in the tray matrix is ​​more prominent, and it is a new light and simple production technology that can replace the traditional nutrition seedlings. main feature 1. Provincial holidays, low labor intensity. According to the survey, compared with the traditional nutrition seedlings, the substrate plug seedlings can save 40% to 50% of seed, and the labor cost is reduced by two-thirds. 2. High seedling rate and strong resistance. Due to the fact that the nutrient matrix is ​​free of pathogens, and the temperature and humidity control in the nursery shed is convenient, seedling diseases and insect pests rarely occur at the seedling stage, and the effects of resisting adverse weather such as low temperature, rain, and rain are also obviously enhanced. Usually, as long as the seeds can emerge, they can become seedlings. There are few rotting buds. 3. The short seedling period is short and the survival rate is high. The seedlings of the seedlings in the matrix culture have developed roots and more roots, and they begin to grow in 3 to 5 days after transplanting. The seedling period is short, and the survival rate is significantly higher than other seedling raising methods. 4. Easy to operate, cotton seedlings are suitable for mechanical transplanting. The tray seedling nursery shed can be selected according to local conditions. Greenhouses, simple middle sheds and small arch sheds can be nursed for planting seedlings and mechanized transplants. Key technologies Sowing date determines the suitable sowing period for the seedlings of the tray seedlings is more elastic, and is less affected by weather and other factors. The sowing date is mainly determined according to the transplanting period, generally about 25 days after sowing, so the sowing date is appropriate around April 10th. The cotton seedlings used for planting can be delayed until April 15-20. The depth of sowing is compared with that of nutrient pods. The hole in the tray substrate seedlings is small, and the water holding capacity is poor. The seeds are too shallow. The seeds are not sufficiently hygroscopic and affect seedlings. The seeding is too deep. The root system extends upwards along the wall of the hole and increases the root system. Difficulties affect the growth of roots. It is best to press the seeds into the matrix after mounting the matrix on the substrate. After covering the matrix and vermiculite, if it is covered with a layer of rice bran, it will be better for preventing the matrix from forming and warming. The use of water to promote water management is the core technology for seedlings in the matrix, which is divided into three stages. The first stage (5 to 10 days after sowing) is the critical period for cotton seedlings to emerge through water, and should ensure sufficient water; the second phase (15 to 20 days after sowing) requires control and promotion, with no dehydration as the basic principle; Three phases (about 25 days after sowing) combined with hardening and wetting of seedlings to carry out drought training. By controlling the moisture, the process of growth and development of cotton seedlings can be mastered, and the transplanting time can be flexibly controlled. If the waterlogging is not enough for 3 to 5 days after filling up the water, it will be necessary to make up the water, and if it is hot and drought, it will be flooded with drought. The seedlings of cotton seedlings rooted from seedlings with seedlings were easy to form "ponytails" at the seedling stage. The rooting ability of the main lateral roots was poor, showing the weak growth at the seedling stage and the markedly accelerated growth rate after emergence. 7 to 10 days after transplanting, 5 kg of urea or 7.5 kg of ammonium bicarbonate can be used to promote the early growth of cotton. Laser Interferometer,Ligo Interferometer,Dc Laser Interferometer,Dual Frequency Laser Interferometer Automated Precision Inc. , https://www.apiasean.com