Onions have a long growth cycle and require consistent nutrient supply to ensure high yield and quality. Timely fertilization is essential, and it should be done in stages according to the plant's development. During the early growth phase, as summer begins and temperatures gradually rise, the plants start to grow more rapidly. At this point, it’s important to apply the first round of fertilizer—known as the "leaf fertilizer." In North China, around late August, farmers typically apply 225–300 kg of compound fertilizer, 225 kg of urea and potassium sulfate, or 15,000–22,500 kg of organic fertilizer per hectare. After applying the fertilizer, it’s recommended to dig trenches and water thoroughly to support leaf development.
By early September, temperatures drop to an ideal range for onion growth, and the green onions enter their most active growth period. This is when they need the most nutrients, so a second round of fertilization—called the "growth fertilizer"—should be applied. The amount should be similar to or slightly higher than the first application. Afterward, farmers often cultivate both sides of the onion rows, turning the ridges back into furrows and watering promptly to meet the rapid growth needs.
From late September to early October, North China experiences cooler weather, which is ideal for the accumulation of photosynthetic products in the onions. This is also the peak time for yield increase. In Shandong, where Welsh onions are commonly intercropped with wheat, farmers apply a final round of fertilizer at this stage. To provide sufficient base nutrients for the wheat, 60,000–75,000 kg of organic fertilizer is usually added, along with 375 kg of compound fertilizer or 300 kg each of urea and superphosphate. This dual-purpose fertilization supports both the quality of the Welsh onions and the growth of the intercropped wheat.
By October, the onions have already reached their maximum leaf number and leaf area, so no additional fertilization is needed. To further enhance cell division, improve leaf photosynthesis, and boost yield, farmers begin spraying Shuofeng 4811 at a concentration of 0.01% every 20 days starting in August. A total of three sprays are applied during this period. This practice not only promotes healthier growth but also contributes to better overall productivity.
Anti-Respiratory
Respiratory disease is a common disease, frequently-occurring disease, the main lesion in the trachea, bronchi, lung and chest, lesions are more cough, chest pain, respiratory effects, severe breathing difficulties, hypoxia, and even respiratory failure and death. Due to air pollution, smoking and other factors, The chronic obstructive pulmonary disease is increasing including chronic bronchitis, emphysema, pulmonary heart disease, bronchial asthma, lung cancer, pulmonary diffuse interstitial fibrosis, and pulmonary infection the morbidity and mortality of the disease at home and abroad . Therefore, anti-respiratory disease drugs are also more and more attention paid by researchers. Respiratory disease have the symptoms of cough, sputum, hemoptysis, chest pain, shortness of breath and other symptoms of lack of specificity, often clinicians mistaken by people for colds, bronchitis, and severe pneumonia, tuberculosis or lung cancer and other diseases delayed diagnosis; Respiratory tract infection, to be developed to emphysema, pulmonary heart disease, respiratory failure was taken seriously, but it was too late, its pathology and physiological function has been difficult to reverse. As with other systemic diseases, careful and detailed medical history and physical examination are the basis for the diagnosis of respiratory diseases, and should be combined with routine laboratory tests and other special findings to conduct a comprehensive and comprehensive analysis. Currently the most clinical application of anti-respiratory disease drugs have the following four categories: 1. Antihistamines 2. Cough medicine 3. Bronchodilator 4. Expectorant 5. Anti-asthma drugs.
Anti-asthma Drugs, Antitussives, Expectorants, β adrenergic receptor agonists, M Cholinergic Blockers, Phosphodiesterase Inhibitors, Anti-Respiratory Drugs,Respiratory System Diseases Treatment
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