(1) Natural astaxanthin: it is a powerful antioxidant, known as the king of anti-aging. Its ability to scavenge free radicals is 6000 times that of vitamin C; 1000 times that of vitamin E; yes β- 100 times the efficacy of carotene; It is 20 times more effective than selenium; It is 700 times the efficacy of anthocyanins; It is 320 times the efficacy of tea polyphenols; It is 10 times more effective than lycopene; 800 times that of coenzyme Q10;: It is 240 times more effective than grape seed extract; It is 200 times the efficacy of carotol (Lutein); It is 3000 times higher than resveratrol[ 1]
(2) Vitamin C: also known as ascorbic acid, is an acidic polyhydroxy compound containing 6 carbon atoms: lack of vitamin C can greatly reduce endurance exercise ability. Vitamin C supplementation can significantly reduce exercise-induced oxidative stress. The safe dose of vitamin C supplementation is 0.5 ~ 3.0 g / day. The recommended daily dose of vitamin C supplement is 0.5 ~ 2.0 G.
(6) Anthocyanins: anthocyanins belong to biological flavonoids, and the most important physiological active functions of flavonoids are free radical scavenging ability and antioxidant ability. Astaxanthin 10% Powder, Glabridin 99% Powder, Tea Polyphenols Powder Xi'an Tian Guangyuan Biotech Co., Ltd. , https://www.tgybiotech.com
(7) Tea polyphenols: tea polyphenols are all natural antioxidant foods extracted from tea. They have the characteristics of strong antioxidant capacity, non-toxic side effects and no peculiar smell. The antioxidant effect of tea polyphenols can eliminate reactive oxygen species and inhibit the consumption of vitamin C, so it can keep skin delicate and white.
Autumn management of planting pearl guava
In recent years, the cultivation of pearl guava has been widely promoted in the Chaoshan region, with the current planting area reaching 100,000 mu. Guava is known for its fast growth, high yield, and multiple flowering periods throughout the year. The fruit is not only delicious but also highly nutritious, making it very popular in the market with a high price. As a result, it has become one of the preferred choices for adjusting the local fruit crop structure. However, during the autumn and winter seasons, the climate is dry, with fluctuating temperatures and frequent frosts, which are all unfavorable for guava growth. Therefore, it's essential to apply appropriate measures to create a more suitable environment for its development. After years of practical experience, I would now like to share my test results as follows:
Firstly, controlling excessive growth and promoting flowering. During the summer months, when temperatures are high and humidity is high, guava grows rapidly, leading to lush foliage and vigorous shoot growth. By late August, the flowering nodes have significantly increased. According to observations, guava typically flowers in the second, fourth, and eighth sections, though some flowers may appear in the eighth to twelfth sections. Additionally, there are many branches, including leggy ones, which leads to a low fruit set rate. To address this, applying B9 (Bloommore) at a concentration of 1000–2000 ppm after mid-August can help control growth and promote flowering. This can be combined with topping, especially at the fifth or ninth section, which often encourages flowering in the fourth or eighth section. With these measures, the number of flowers usually increases by 1–2 times compared to untreated plants. These flowers are easier to set. However, when using growth regulators, the dosage should be adjusted based on seasonal conditions. Once the weather turns cold in November, switching to Chrysogen can help protect the flowers from frost. Borax should be used together with chlormequat. Although chlorothorin can increase the bitterness of young fruits, combining it with borax helps reduce bitterness and improve sweetness.
Secondly, pest control. In autumn and winter, the main pests affecting guava include anthracnose, which can be controlled with 70% thiophanate-methyl WP or 75% chlorothalonil diluted at 800 times. Aphids, scale insects, and leaf miners are also common and can be treated with 20% fenvalerate EC diluted at 1000 times or 24% DuPont Wanling agent at the same dilution. If pink locusts damage young shoots, causing them to turn black and shrink, it’s important to act quickly. Using products like Green Blessing or Fast Spirit can effectively control these pests. During the dry season, root nematodes are also a concern, which can cause severe damage to guava orchards. Symptoms include purple leaves that gradually turn red and wither from the bottom up, leaving bare trunks. If not controlled promptly, surrounding plants may show similar symptoms. Therefore, once any signs of infestation are detected, immediate action is necessary. One effective method is to mix groundworms with fine sand and apply it to the soil, mixing it with the topsoil around the tree base to prevent further spread.
Thirdly, the proper use of foliar fertilizers. Applying foliar fertilizer during autumn and winter is highly effective. A mixture of 1% superphosphate and 3% urea can significantly boost production. Another effective combination is 0.5% potassium dihydrogen phosphate with 0.2% borax, which promotes fruit development and enhances sweetness. Due to reduced sunlight and lower photosynthetic activity during these seasons, along with heavy fruit load, the flavor of guava tends to weaken. Therefore, farmers should combine regular fertilization with foliar feeding to maintain fruit quality.
Chaozhou City Fruit Research Institute
Su Zhangcheng