Second, the temperature caused by falling flowers and fruits: the temperature is too low, too high and drastic changes will also cause tomatoes to fall and fall. For tomato flowering, if temperatures below 13°C or above 30°C are encountered, it will cause poor pollination, resulting in fruit drop and fruit drop. Preventive measures: Prevent the temperature of the booth from being too high or too low by means of ventilation or cover double-tie, and try to avoid the emergence of low temperature or high temperature environment, shorten the duration of low temperature or high temperature. Note that the temperature difference during the flowering period should not be too large. Generally, the temperature difference between day and night is 8~10°C. Third, malnutrition caused by falling flowers and fruits: lack of fertilization and inequality, resulting in plant nutrient deficiency, especially the shortage of trace elements, such as boron, magnesium, calcium, etc., can easily lead to flowering and fruit drop, CO2 concentration is too low, so that plants in photosynthetic hunger , It is also easy to cause falling flowers. Preventive measures: Basal fertilizer should be applied adequately and evenly, topdressing should be applied less frequently, and flowering period can be carried out with 2 to 3 times foliar dressing, applying some trace element fertilizers. Application of CO2 fertilization in the shed, so that the CO2 concentration reached 1000 ~ 1200ml / L, can effectively reduce the flower drop. IV. Falling and falling caused by improper management: If the management of fertilizers and water is improper, if the plants are weak or grow too prosperous, the fruit setting rate will be very low; the plants and flower organs will be mechanically damaged and they will also fall and fall. Preventive measures: In the field operations, pay attention not to harm the plants and flower organs; Second, strengthen the management of fertilizer and water, make the plants robust; Also scientifically use plant growth regulators, such as plants, can be used Chlormequat 250mg/L soil Watering, the amount of each plant 100 ~ 200ml, effective within a week. V. Planting and fruit drop caused by diseases and insect pests: When plant diseases and insect pests occur, especially at flowering stage, the physiological function of the plant will be disordered and the fruit will fall and fall. Preventive measures: timely comprehensive management of pests and diseases. Special attention should be paid to avoid spraying during full bloom, reduce the use of water, and use more smoke and dust, so as not to increase the relative humidity of the air in the greenhouse and increase the drop. The drug concentration should be moderate. Hebei Fuping County Agricultural Bureau Technical Station YT-H008 YT-H008 Shenzhen Sunshine Technology Co.,Ltd , https://www.szyatwin.com
How to prevent the falling of tomatoes in winter greenhouses
First, the cause of light caused by falling flowers and fruits: the normal growth of tomatoes suitable for the light hours of 12 to 16 hours, light intensity of 4 to 70,000 LX (lux). The intensity and hours of light in winter and spring are obviously insufficient, and once the winter and spring rainy weather is excessive, in order to keep warm, the greenhouse cover is exposed late, covered early, or even uncovered all day, which affects photosynthesis and causes pollen malnutrition and pollination. Bad, causing falling flowers and falling fruit. Preventive measures: 1. Increase the light-transmitting time as much as possible; 2. Artificially fill the light, can hang a 40W light bulb every 3 meters in the shed, and fill light for 1 to 2 hours in the morning and evening.