Measures for preserving seedlings of Spring Cotton

Seeds are ready to buy superior seeds, and high-quality seeds are the prerequisite to ensure seedling emergence rate, seedling quality, seedling integrity and seedling strength. Therefore, it is necessary to choose and buy seeds with standard packaging, good maturity and plumpness and high germination rate produced and operated by large manufacturers.

Seed dressing can be done with 50% carbendazim WP, 30% seedling enemy WP, or 50% methyl topiramate WP and 0.8% 3911EC, with 2kg of water for every 100kg of seeds. Before sowing the seeds, choose fine weather and spread the cotton seeds in broken bags for 2-3 days.

When the land is ready to choose cotton land, it is best to choose raw land or rotation land that has not been planted cotton, and the land that has been cropped for many years should avoid continuing to grow cotton. The land where cotton is planted should be turned 25cm to 30cm deep to reduce the surface pathogen and facilitate seedling emergence. Irrigate in advance, lest because the irrigation is too late, the soil is too wet and the ground temperature is low, which is not conducive to seedling emergence. Rake the ground before sowing to make it "neat, flat, loose, broken, clean and moisture".

Reasonable fertilization, such as improper use of seed fertilizer, especially excessive use of nitrogen fertilizer and undermature chicken manure, will affect the emergence rate of cotton seeds. Therefore, it is necessary to apply sufficient base fertilizer and manure to be fully mature, and pay attention to the ratio of N, P and K.

The scientific sowing date should be suitable for production to put too much emphasis on early sowing. If the average temperature is stable at 10 ℃ ~ 12 ℃, early sowing will result in "early but incomplete". In case of cloudy and rainy weather, the double effects of low temperature and high humidity are more likely to cause rotten seeds and rotten buds. Generally, when the average temperature of the day is stable at 10 ℃, the ground temperature of 5 cm under the plastic film can reach more than 12 ℃, which can be sown with plastic film. The suitable time for perennial plastic film sowing in southern Hebei is from April 20 to April 30.