Zucchini melon refers to the fruit of the zucchini female flower within 3 to 4 days after opening, the young fruit apex retreats green to yellow, becomes fine and soft, the fruit does not swell or swell very little, the surface loses luster, the apex shrinks, and finally rots or falls off. Zucchini melon is the most common and most common problem for vegetable farmers in greenhouse cultivation. The cause of melon is mainly caused by unsuitable environmental conditions and imbalance of nutrient supply. The zucchini melon can be effectively prevented by taking the following measures. Disclaimer: Some articles on this website are transferred from the Internet. If legal rights of third parties are involved, please inform this website. phone
Carnitine, or trans. carnitine, is an amino acid, a quaternary ammonium cationic complex, which can be biosynthesized from both lysine and methionine and is involved in the metabolism of fat into energy in the body. Carnitine has two stereoisomerism: L-Carnitine, which is biologically active, and D-carnitine, which is non-biologically active. L-carnitine (L-carnitine) is an amino acid widely distributed in the liver, especially in myocardium and skeletal muscle. Most of the carnitine required by the body comes from meat and dairy products in the diet. [1]
Carnitine is an amino acid widely distributed in the liver, especially in cardiac muscle and skeletal muscle. Most of the carnitine components required by the body come from meat and dairy products in the diet. In addition, the body itself can synthesize part of methionine as raw material, and the body needs Vitamin C, iron, B6 and niacin as auxiliary factors of various enzymes in the reaction when biosynthesizing carnitine. L-carnitine is widely present in the body, especially in mitochondria. The concentration of L-carnitine was highest in the adrenal gland, followed by the heart, bone, muscle, adipose tissue and liver. Free L-carnitine is excreted in the urine. Plant-based foods contain less l-carnitine (in some cases none), as well as less lysine and methionine, the two essential amino acids that make carnitine. The l-carnitine content in animal food is high, especially in liver. Foods rich in L-carnitine include yeast, milk, liver, meat and other animal foods. Humans and most animals can also meet their physiological needs through synthesis within their bodies. L-carnitine is not deficient under normal conditions.
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1. Choose the right variety. Zucchini is a cross-pollinated crop, and the requirements for environmental conditions during flowering are very strict. However, different varieties have different sensitivities to conditions such as warm light and light, some endogenous hormones are produced more, and there are relatively few varieties of melons with strong parthenocarpy ability. Therefore, in order to prevent the melon, a single strong and strong variety can be selected, such as Emerald.
2. Appropriate thinning and fruit thinning. In the cultivation of zucchini in the greenhouse, due to environmental conditions conducive to the differentiation of female flowers, or the strength of the variety itself is strong, resulting in too much young melon, even a multi-cucumber, the result is that the melons compete for nutrition and cause melons. Therefore, when too many melons are found, the fruit can be thinned and thinned, so that the remaining melon can get sufficient nutrient supply.
3. Reasonably adjust the shed temperature. The optimum temperature for growth and development of zucchini is 18-25 °C. If the temperature is too high, especially if the night temperature is too high, it will lead to increased breathing and increased nutrient consumption, which will cause the melon. When the temperature is too low, the photosynthesis and root absorption capacity will be reduced, resulting in insufficient nutrition to cause melon. Therefore, in the period of zucchini melon, the temperature in the shed should be adjusted. Generally, the temperature is controlled at 20-22 °C during the daytime. When the temperature is higher than 25 °C, the wind should be properly released. Keep at around 10 to 12 °C at night. Keep the temperature difference between day and night not less than 10 °C to meet the normal growth and development of zucchini.
4. Determine the appropriate density. The density of planting of zucchini is too large, and the competition between the plants for nutrients leads to nutrient deficiency and melon, and the planting density is too small, which will affect the overall yield. Generally, the planting density should be controlled at 2000-2500 plants/mu. When planting with large and small row spacing, the large row spacing is 80 cm, the small row spacing is 60 cm, and the plant spacing is 40 cm.
5. Strictly prevent gas hazards. In the cultivation of zucchini in the greenhouse, if the fertilization is improper, or if the sulphur powder is fumigation sterilized and disinfected, NH3, NO2, SO2 and other harmful gases will often be generated. When the harmful gas accumulates to a certain extent, the zucchini will be damaged and the melon will be caused. Therefore, the following measures must be taken to prevent the generation of harmful gases. 1 Organic fertilizer should be fully decomposed and then applied to the shed. It is strictly forbidden to apply quick-acting nitrogen fertilizer in the shed. It must be applied deep or with water to prevent ammonia from volatilizing. 2 Do not apply too much nitrogen fertilizer at one time to avoid NO2 gas generation. 3 When fumigation with sulfur powder, it is generally carried out before planting to avoid fumigating with sulfur powder during the growth of zucchini to avoid the generation of harmful gases such as SO2.
6. Avoid plant growth. When zucchini appears to have a long trend, it will inhibit reproductive growth and become melon. Therefore, the balance between vegetative growth and reproductive growth can be adjusted by delaying the topdressing and watering period, controlling the amount of nitrogen fertilizer, and the like. For the field where the internode is too long, the growth is weak, and there are signs of long signs, 50-100 mg/kg of chlormequat can be sprayed to inhibit the growth of the fruit and promote the normal development of the fruit.
7. Prevention and control of gray mold. When the zucchini is dry-dyed by gray mold, it is mainly immersed in the defeated female flower, and then spread to the fruit, causing the baby to soften and shrink and turn the melon. Therefore, the prevention of gray mold should be strengthened, the temperature and humidity management in the shed should be done well, and the conditions of low temperature and high humidity should be avoided as much as possible. Once the disease is available, 72% DuPont Dew 800 times solution + 80% Ethium Phosphate 500 times solution, 72.2% Plex 700 times solution, 75% chlorothalonil 800 times solution can be used for spraying.
8. Timely harvest. If the zucchini is not harvested in time after ripening, the melons will grow too large, which will affect the growth of the plants and the absorption of nutrients by the new melons, which will lead to the new melons. Therefore, the zucchini should be harvested in time after it matures. Generally, when the zucchini grows to 300-400 grams, it can be harvested. Generally, it should not exceed 500 grams. The harvesting standard can also be determined according to local consumption habits.