1. Seed Treatment: Before sowing, it is recommended to soak the seeds for 2-3 days to enhance the germination rate and overall germination potential. Apply a seed dressing with either pentachloronitrobenzene or carbendazim to prevent seedling diseases. Note that coated seeds do not require additional treatment before planting. Choose a sunny day for sowing to ensure optimal conditions for seed germination.
Second, Timely Sowing: The ideal sowing time varies depending on the method used. For nursery seedlings, sowing typically takes place from late March to early April. Plant 2-3 seeds per pod, and for coated seeds, plant 1-2 grains per seeding. Cover the seeds with about 1-1.2 cm of soil. When using base film covering, the best time is around April 20th, while direct sowing in open fields is most suitable around April 25th.
Third, Post-Emergence Management: Regardless of the sowing method, it's essential to water the seeds thoroughly after planting. Maintain daytime temperatures between 28°C and 32°C, and nighttime temperatures between 15°C and 18°C before the seedlings emerge. Once the seedlings appear, start ventilating gradually, increasing the air flow as needed. Keep daytime temperatures around 25°C during this stage. In the first week after emergence, implement a low-temperature hardening process. If there is a period of low temperature and rain, apply Bordeaux mixture or a specialized seedling protection solution to prevent disease and protect young plants.
Fourth, for most cotton varieties, sulfuric acid dehulling is an effective method. However, some varieties have thinner seed coats, such as Yuzhan No. 19, which can be easily damaged during dehulling, potentially reducing the germination rate. Therefore, it is advisable to use hair-seed sowing in production for these varieties to avoid damage and ensure better growth outcomes.
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