Lappaconite Hydrobromide,Lappaconite Hydrobromide Powder,High Purity Lappaconite Hydrobromide,Cas 97792-45-5 Shaanxi The River Pharmaceutical Co., Ltd. , https://www.dahepharma.com Physiological diseases of watermelon in greenhouses refer to the phenomenon of plant abnormalities caused by physiological disorders in watermelons that cannot adapt to the environment. Here are some common physiological disease prevention methods for greenhouse watermelon:
One, root
1. cause. In early spring, the temperature during nursery is low, the ground temperature is lower than 12°C, the soil moisture is too high, and then it encounters continuous rainy weather, or a long-term low temperature and high humidity environment of 5-6°C, and the seedlings are wilting for a long time, resulting in the occurrence of root collapse.
2. Precaution. 1 Select seedbed nursery, use greenhouses and small sheds to add electricity hotline (80-lOOW/m.) for light nutrition seedlings plug tray seedlings, nutrient alum early fertilization, turn over the sun, mature soil; selected high-lying, sheltered sunny place Do seed bed; sow foot water before sowing to ensure full seedlings. 2 Strengthen seedbed management, soil temperature at seedling stage is controlled at 15-25°C, daytime temperature of cotyledons and two true leaves is controlled at 22-28°C, night temperature is 18-13°C; watering is controlled, rainy days are not watered, Pay attention to ventilation and loose wet; continuous rainy weather, use incandescent lamps to add light, reduce the occurrence of yellow leaves. (3) For melon seedlings with lighter roots, warming and dehumidification can be achieved by loosening the seed bed, spreading dry fine soil and plant ash, and promoting recovery. 4 After the melon seedlings have new roots, spray 0.3% potassium dihydrogen phosphate solution and 800% Huimanfeng to promote root growth.
Second, burning root
1. cause. Excessive fertilization, soil drought, water shortage, fertilizer is not fully decomposed, bed soil and fertilizer mix unevenly.
2. Precaution. 1 The amount of fertilizer used in the preparation of bauxite should be appropriate to avoid excessive use of chemical fertilizers. In general, 0.5 kg of diammonium phosphate, 0.5 kg of potassium sulfate, 80 mg of carbendazim and 60 g of trichlorfon are added for every 600 kg of nutritive soil. 2 The organic fertilizer should be thoroughly cooked and mixed with the bed soil. When mixing the bed soil, the raw cake fertilizer and urea should not be mixed in order to prevent fertilizer damage. 3 The seedbeds are watered in a timely manner to keep the beds moist and prevent seedlings from sprouting due to lack of water in the soil. 4 The occurrence of root burning melon seedlings should be appropriately increased the amount of water in order to wet the bed soil is appropriate, appropriate to increase the bed temperature, in order to facilitate root growth.
Third, high foot seedlings
1. cause. Seed bed humidity is too high, the temperature is high, the light is insufficient, the seedling density is too large, and partial nitrogen fertilizer is applied.
2. Precaution. 1 seedbed temperature management, maintain the temperature before emergence 30-35 °C; 70% -80% of the seed when the seedlings, appropriately reduce the temperature during the day to maintain 20-22 °C, 15 °C at night; continuous rainy weather, using incandescent lamps to add light, Insufficient light, appropriate to reduce the temperature and humidity. 2Appropriate fertilization, application of phosphorus and potassium fertilizers, spraying 0.3% potassium dihydrogen phosphate 2-3 times at the seedling stage.
Fourth, the virus
1. cause. 1 The soil temperature is low, the soil is heavy and the water content is high, which makes it difficult for the roots of watermelon seedlings. After the planting, continuous rain is more likely to occur. 2 The application of unripe organic fertilizer fever burning roots, or excessive use of chemical fertilizers, fertilizer concentration is too high and injure the root. 3 When the herbicide is used for soil sealing treatment, the medicine is used improperly or the dose is too large.
2. Precaution. 1 Select porous, good-permeability vegetable garden soil as nutrient soil, and nutrient soil to fertilize as early as possible. 2 Select new seeds with strong vitality and plumpness, and adopt electric hot-line nursery. 3 Decompose 1000-1500 kilograms of chicken manure and appropriate amounts of nitrogen, phosphorus, and potassium fertilizers 20 days before planting. Fertilizer and soil are mixed evenly; 72% Dole EC 80-lOOml or 96% Jindul Emulsifiable Oil per acre of Daejeon 40- 50 ml of water is sprayed on 40-50 kg of water, and watermelon seedlings are planted after 5-7 days. Acetochlor is not recommended. 4 After the planting, a stiff seedling was sprayed, and it was sprayed with a 600-fold solution or a 800-fold solution of Huimanfeng, and the temperature was increased by closing the shed.
Fifth, self-styled top seedlings
1. cause. The temperature of seedbed is low, water droplets are attached to the growth point of watermelon seedlings, and Chen seeds have low viability.
2. Precaution. The new seed with strong germination potential was selected and covered with no drip film. The electric heating line was used to raise the seedlings, and the seedbed temperature was maintained at 25-28°C.
VI. Blade whitening
1. cause. Improper ventilation during seedling period, resulting in a sharp drop in seedbed temperature.
2. Precaution. Seedling during the day to keep the bed temperature above 20 °C, at night not less than 15 °C: seedbed ventilation during the day should not be too early, the vents choose greenhouse lee side, to avoid sweeping wind injury seedlings, ventilation should be gradually increased.
Seven, thick vines
1. cause. Nitrogen fertilizer and excessive water, pruning is not timely, nutrient growth is too busy, less fruit on the vine.
2. Precaution. Balanced fertilization, application of phosphorus, potash and organic fertilizers; control watering at seedling stage, timely ventilation of small greenhouse film: when there are thick vines before and after flowering, pinch growth points with fingers, inhibit the growth of melon vines; artificial pollination after flowering, Promote fruit setting.
Eight, abnormal fruit
1. cause. 1 Plectrantana: The fruit development is unbalanced, one side develops normally, and the other side develops stagnation. It is caused by poor ovary development, uneven pollination, or poor fertilization. 2 flat melon: melon diameter is greater than the longitudinal diameter, so that the melon was flat. The low temperature of the female flower or the melons in the low-potential female flower is easy to form a flat melon. 3 sharp mouth melon: The peduncle part of the melon becomes thinner, and the stem part expands. Insufficient supply of nutrients during fruit enlargement and high-spotted fruit set-up make it easy to form sharp-edged melons. 4 gourd gourd: The top part of the melon close to the flower pedicle area enlargement, and close to the fruit stem is smaller, showing a gourd-like. Caused by poor fertilization.
2. Precaution. 1 Strengthen seedling management. In the 2-4 true leaf stage of flower bud differentiation, avoid the influence of low temperature, fertilizer and water supply should be appropriate. 2 Select the second 2-3 female flowers to stay melon. Different males were collected at 7-10 am for artificial pollination. The pollen was evenly spread on the stigma. The amount of pollination was sufficient. The pollination temperature was kept above 20°C to increase pollen activity and promote fertilization. 3 timely correction of fruit shape. Turning the young larvae 1-2 times during fruit development. 4 Supply enough moisture. Watermelon meets the continuous drought in the fruit period to supplement fertilizer and water, and pay attention to increase phosphorus and potassium fertilizer.
Nine, empty fruit
1. cause. Melon cracks and cracks form. Large fruit varieties, low temperature conditions and prosperous fruit setting are prone to empty fruit. The main reason for the empty fruit production is the inconsistent growth speed of the peel and the melon.
2. Precaution. 1 Select medium and small fruit varieties. 2 Strengthen field management, promote watermelon fruit setting and enlargement under proper conditions, keep temperature at 25-35°C during fruit setting, 18-20°C at night, and delay fruiting appropriately under low temperature or drought conditions. 3 timely pruning, to prevent running vines, generally using 3 vine pruning, that is, in addition to leaving a main vine, and then choose to leave 2 vines, the remaining side vines removed; when the size of watermelon eggs, thinning fruit, the first batch of melons per plant Leave one to choose.
Ten, cracked fruit
1. cause. Peel thin varieties and small varieties are prone to occur. In the early stage of fruit enlargement, when the temperature is low, the rapid expansion occurs after the development ceases. The amount of water in the late stage of fruit enlargement to the harvesting stage is improper. The fruit develops at a certain stage of drought and the development of the fruit is blocked. Suddenly large quantities of water can easily cause cracking.
2. Precaution. Select the appropriate variety, the temperature of the early fruit expansion maintained at least at 20 °C; appropriate amount of water, the fruit matured in the case of high temperature and dry weather prohibited flooding irrigation.
Eleven, poor quality fruit
1. cause. 1 The fruit is exposed to high temperature and direct sunlight for a long period of time, which results in the obstruction of nutrient and moisture transport required for fruit growth. 2 Suddenly, after sunny and rainy days, the soil became dry and wet, and the water changed drastically. 3 defermented later watermelon, plant premature aging. 4 Virus disease plants are prone to produce poor fruit quality.
2. Precaution. 1 Fruits in the hot season should be protected from sun exposure. Weeds can cover fruits. 2 During the fruit enlargement period, increase 10 000 kg of cooked cake fat, 10-15 kg of diammonium phosphate and potassium sulfate, and timely watering to prevent premature aging. 3 Timely use of 10% imidacloprid 1000 times to control aphids and whiteflies.
3.95% Virus 500 grams to prevent viral disease.
Twelve, umbilical rot fruit
1. cause. In the case of prolonged drought, the water and nutrients supply is imbalanced during fruit enlargement, and leaves and fruits compete for nutrients, resulting in a large loss of water in the umbilicus of the fruit, impeding its growth and development, or causing excessive absorption of calcium in the watermelon due to excessive nitrogen fertilizer application. Cause umbilical cell physiology disorders, loss of water control, or the application of hormone drugs interfere with the normal development of fruits, resulting in umbilical rot.
2. Precaution. Add cooked cake fertilizer and superphosphate, cover all the surface layer of the film; balance the supply of fertilizer, timely watering and drought resistance in dry weather; foliar spray calcium solution or 1% superphosphate solution: pay attention to use chlorothalonil, methyl Topoxine prevents disease.