(I) Overcoming Challenges for High Yield of Artemisia selengensis When growing Artemisia selengensis, it's essential to manage high temperatures effectively. This plant prefers a cool and humid climate, making it semi-cold-resistant but not heat-tolerant. The ideal temperature range for growth is 17-20°C, and above 29°C can lead to poor development, with fewer and smaller leaves. High summer temperatures are often the main cause of planting failure. To ensure healthy growth and high yields, it's crucial to keep the temperature inside the greenhouse within the optimal range. Effective cooling methods include using shade nets and spraying water on the structure. However, watering during the hottest part of the day is generally not recommended, as it can damage roots and cause seedlings to die due to sudden temperature changes. Another important factor is preventing lodging. Artemisia selengensis tends to grow tall and weak when planted too densely or in conditions with high humidity and excessive nutrients. This makes the stalks prone to falling over, which reduces yield and can cause lower leaves to rot, lowering the commercial value of the crop. To prevent this, it's best to space seedlings properly—keeping them around 2-3 cm apart—and use growth regulators like 3000 times diluted solutions or 1500 times diluted sprays to strengthen the stems. Preventing rainwater from entering the greenhouse is also critical. Summer rains can cause root rot and reduce yields. Therefore, it's important to cover the greenhouse before it rains and ensure that any water that enters is drained quickly. If rainwater accumulates, replace it with clean water to avoid plant death. Disease prevention is equally vital. Leaf health directly affects the commercial value of Artemisia selengensis. Common diseases such as leaf spot and downy mildew can cause yellowing and decay. Regular applications of fungicides like Polyram and Ridomil can help prevent these issues. In addition, pests like Plutella xylostella and Spodoptera litura should be controlled using insecticides like Methomyl. (B) Growing Spinach in Summer: Key Tips One of the biggest challenges in summer spinach cultivation is proper watering. It’s important to maintain consistent moisture without overwatering. Water small amounts after sowing, and add more if needed, but avoid flooding the area. If the soil becomes extremely dry, misting the leaves can help retain moisture. After watering, it's also important to remove weeds to prevent moss growth. If moss appears, remove the shade net promptly to avoid rotting plants. Second, protecting the greenhouse from rain is crucial. Before heavy rain, check the roof film for holes and repair them immediately. Cover both sides of the greenhouse with plastic to prevent water from entering. In case of heavy rain, you can place a layer of soil along the edges to secure the film and prevent water leakage. Third, disease control is essential. Spinach is vulnerable to damping-off, downy mildew, and bacterial rot. A common practice is to spray a mixture of Big Student and Permap every five days after seedlings emerge. Later, a combination of Kelu, Avermectin, and Streptomycin can be used to control further infections. In addition, using yellow sticky traps and pest nets can help manage pests effectively. Lastly, spinach is prone to convulsions before harvest, which reduces its marketability. To avoid this, it's best to harvest early—when the plants reach 20-25 cm in height. This minimizes the risk of convulsions and maintains quality. (3) How to Avoid Convulsions in Summer Vegetables Lettuce is a semi-cold-tolerant vegetable that thrives in cooler, humid conditions. High temperatures, humidity, and strong sunlight can cause lettuce to go into convulsions, especially during summer. While some heat-tolerant varieties are available, such as Italian-resistant sorghum lettuce, careful management is still required. First, protect the plants from intense heat and light. Use shade nets or apply mud to the greenhouse to reduce temperatures. Spraying water during midday can also help lower the ambient temperature. Second, shorten the growing period by harvesting earlier. This reduces the likelihood of convulsions and ensures better quality. Third, avoid over-crowding. Planting too densely can increase the risk of convulsions. Aim for about 5000-5500 plants per acre. Additionally, intercropping with solanaceous vegetables or melons can provide natural shade and help regulate temperature, benefiting lettuce growth. (D) Protecting Leaves During Summer Proper watering is essential for maintaining healthy leaves. As temperatures rise, plants require more water. At around 35°C, watering every two days may be necessary. If the soil isn’t moist after pulling up a seedling, it’s time to water. Don’t wait until the ground is completely dry, as this can cause leaf wilting. Applying foliar fertilizers every five days helps supplement nutrients and improve the plant’s resistance to stress, reducing the occurrence of leaf wilting. Thinning should be done carefully. A spacing of 3-4 cm between plants is ideal. Some farmers spread out the plants to make them thicker, but this can actually increase leaf exposure to sunlight, leading to faster wilting. Finally, after heavy rains, rinse the leaves with water to remove mud, which can hinder growth and reduce quality. It is very important for the synthesis of polyurethane adhesives and sealants, which directly affects the mechanical properties and process In a broad sense, most of the weak reductants are antioxidants and are selected for different industrial USES. 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