Technical points of planting cotton with one sowing and whole seedling
1. Variety selection: select hybrid varieties with high yield and good quality potential and strong stress resistance, such as Hanza 429 and Hanza 301, or conventional varieties such as Ji 228 and Han 7860.
Second, seed treatment: including seed drying and germination test before sowing. Sun-sow seeds for 3-5 days before sowing to promote seed ripening to improve seed germination rate and germination potential. Do not dry seeds on cement or asphalt. 100 or 200 seeds were randomly selected and the bud percentage test was carried out to determine the sowing amount.
Third, fine soil preparation, adequate soil moisture sowing: soil moisture has a direct impact on cotton emergence, if not enough moisture can be sown half a month before cotton sowing, sowing soil moisture. Soil preparation requires deep ploughing of 25-30 cm, the ground is flat, empty and solid, and there is no light and dark.
Fourth, sowing at the right time: when the ground temperature of 5 cm stably passes through 14 ℃ and rises to 16 ℃ in a short time, sow seeds at the cold end and warm head, and the sowing time is generally about April 20-25.
5. Sowing rate: 1 kg of hybrid cotton per mu and 2 kg of conventional cotton per mu.
6. Sowing depth: the sowing depth should be 3-4 cm.
7. Check seedlings and replenish seedlings: check seedlings and replenish seedlings in time after emergence, accelerate budding and replanting in the plots with more seedlings, and transplant seedlings in the plots with less seedlings.
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How to ripen cotton correctly with ethephon
Many years 'practice shows that it is a simple and easy measure to use ethephon correctly to accelerate ripening of late-maturing cotton field, which can increase yield and income. Late maturing cotton sprayed with ethephon could open boll 7-10 days earlier, flower rate before frost increased by 10%-20%, yield increased by 6.4%-10.2%, and yield increased per mu.
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Deficiency and excess symptoms of main nutrient elements in growing cotton
1. Cotton nitrogen deficiency and excess symptoms: cotton plants are short of nitrogen, plants are short and lignified, leaves are yellow and green, leaves become smaller, petioles are shortened, lateral branches are few, and the number of leaves decreases. The lower leaves of cotton plants were most obviously affected by nitrogen deficiency, the top stopped growing and the number of flowers blossomed.
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