Hybrid cotton offers significant advantages over traditional varieties in terms of yield, fiber quality, disease resistance, and adaptability. It is a key strategy for boosting cotton production. However, the development of cultivation techniques for hybrid cotton has not kept pace with the advancement of hybrid varieties. Several challenges still exist in the cultivation process, which limit the full exploitation of hybrid vigor and yield potential. To address this, we present standardized cultivation practices tailored for hybrid cotton in the Yangtze River Valley region, providing practical guidance for farmers.
I. Selection of High-Quality and Medium-Maturing Hybrid Cotton Varieties
In most cotton-growing areas, the soil type is typically sandy loam or oil sand, with relatively high fertility levels. Therefore, it is recommended to choose medium-maturing, high-quality hybrid varieties that have strong plant architecture and high individual productivity. The planting density should be carefully managed, with a spacing of 90–100 cm between plants, resulting in approximately 2,000 plants per acre.
II. Cultivating Strong Seedlings
Choose a sheltered, sunny location with good drainage and no history of wilt or Verticillium wilt. The seedbed should be well-prepared, with timely sowing, proper temperature and humidity control, and regular spraying of disease prevention agents. Seedlings should be protected from high temperatures and given appropriate nutrients if they are weak. Two days before transplanting, water the seedlings and apply a nutrient solution to ensure they are ready for transplanting with "three essentials" — fertilizer, medicine, and water.
III. Film Mulching and Improved Transplanting Quality
After harvesting the previous crop, plow the land, apply fertilizer, remove weeds, and prepare the field for mulching. Use ultra-thin film (0.004–0.006 mm thick), with widths ranging from 40–50 cm for single-row covering and 100 cm for double-row covering. Before transplanting, create small holes in the film and place the seedlings so that the hole depth is 1–2 cm deeper than the plant height. Cover the roots with fine soil to prevent moisture loss, then water the roots and press the film firmly after planting.
IV. Increase Fertilizer and Potassium, Apply in Stages
Mulched transplanted cotton grows rapidly, leading to early flowering and increased nutrient uptake. This requires careful fertilization planning to meet the "early growth, long-lasting" needs and avoid premature aging.
1. Base Fertilization: Apply 20–25 kg of pure nitrogen, 6–8 kg of P₂O₅, and 15–20 kg of K₂O per mu, along with 0.5–1 kg of boron and zinc fertilizer. Nitrogen and potassium should be increased compared to conventional methods.
2. Topdressing After Film Removal: At the budding stage in late June, remove the film and apply 50 tons of fermented cake fertilizer plus 5–7.5 kg of urea (or 15–20 kg of ammonium bicarbonate) per mu.
3. Early Flower Bud Fertilization: Apply 25–30% of total nitrogen at the first bloom, followed by 30% at the beginning of boll formation.
4. Foliar Spraying: In mid-August, apply 10–15% of the total nitrogen as foliar spray, and continue with 0.5% urea and 0.3% potassium dihydrogen phosphate every 7–10 days if needed.
5. Weeding and Pest Control: Regularly cultivate the soil to loosen it, increase ground temperature, and prevent lodging. Manual weeding is preferred, with chemical herbicides used as a supplement.
V. Rational Growth Management
Due to vigorous early growth, hybrid cotton is prone to excessive vegetative growth. Chemical regulation is essential to maintain balance, reduce bud drop, and promote a high-yield plant structure. Use growth regulators like acetaminophen at specific stages to control growth and improve plant health.
VI. Integrated Pest Management and Scientific Harvesting
During the seedling stage, monitor and control snails, blind beetles, and red spiders. In the bud stage, focus on pests such as aphids, leafhoppers, and bollworms, while also managing diseases like wilt and Verticillium. In later stages, continue monitoring and controlling pests until the end of September. Harvest scientifically, picking mature bolls 5–7 days after opening, avoiding dewy or unripe ones. Use bags for collection, dry on bamboo mats, and sort, store, and sell in separate batches to maintain quality and prevent contamination.
Anti-Viral
The virus is composed of a nucleic acid molecule (DNA or RNA) with a protein consisting of non-cell morphology of the campal life of the living body. The general symptoms of viral infection are fever, headache, cough and other symptoms of systemic poisoning and viral host and invasion of tissues and organs leading to inflammatory symptoms caused by local symptoms (diarrhea, rash, liver function damage, etc.). Different symptoms of the different virus, some viruses can also damage the myocardium, causing viral myocarditis. There are two types of viral infections, mostly recessive infections (subclinical infections), and a few are dominant infections. Dominant infection can be divided into acute infection and persistent infection. There are many ways of antiviral infection, such as direct inhibition or killing of viruses, interference with virus adsorption, prevent viruses from penetrating cells, inhibit viral biosynthesis, inhibit viral release or enhance host antivirus capabilities. At present, there are several major types of antiviral drugs: Anti-Respiratory virus infection drugs, anti-immune virus drugs, anti-hepatitis virus drugs, anti-herpes virus drugs.
Anti-Viral Intermediate,Pharmacogenetics Testing,Anti-HIV Pharmaceutical Intermediates,Anti-HCV Pharmaceutical Intermediates,Antiviral Drugs for Flu
Taizhou Volsen Chemical Co., Ltd. , https://www.volsenchem.com