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When there is 95 percent relative humidity and air temperature is 60 degrees Fahrenheit, for example, a plant’s leaf only needs to be 59 degrees Fahrenheit for moisture to condense on it. Dr. Nadia Sabeh said if the plants experience high temperatures during the day, but the temperature can be cooled down during the night, as long as the average temperature is 72ºF, the tomato plants are happy. Room temperature, … Storage >27°C reduces intensity of red colour, while storage <13°C retards ripening and can lead to development of chilling injury, particularly in tomatoes at the mature-green stage. Ideal storage conditions for tomatoes depend on the maturity stage of picking. Ideal conditions for ripening are 19°C to 21°C with 90% to 95%RH. Best growing temperature. A layer of straw, compost, or grass-clipping mulch helps moderate soil temperature, so it doesn’t fluctuate so much. Air temperature affects several aspects of tomato development, including growth, photosynthesis, respiration, and physiological development.1 Temperature also affects relative humidity in that warm air can hold more water than cool air, and relative humidity is expressed as a percentage of the maximum amount of water that the air can hold.. Understanding the effects of temperature is … Temperatures above 81°F reduce intensity of red color and reduce fruit shelf-life. Mulch Helps. When high heat lingers with days above 100°F and nights over 80°F, most tomato ripening stops altogether. Temperature-induced problems. That's a solid 20°F under the happy temperature of a ripe tomato. When temps consistently hit the 95-degree range, tomatoes tend to stop producing red pigments, which means typically red fruits may instead ripen to orange. 3) Products sensitive to ethylene should not be stored together with products producing ethylene. Green tomatoes are chilling sensitive. Growing Temperatures for Tomatoes. 2) Spraying with water may be effective by keeping the temperature low (evaporative cooling) and the surface 100% humid. Besides the recommended levels it also shows at which level the humidity deficit becomes a vegetative action, and when it is a generative action. The best daytime growing temperature for greenhouse tomatoes is 29.4 degrees Celsius (85 degrees Fahrenheit), because it facilitates the plant growing and fruiting properly. The minimum temperature to germinate tomatoes is 15ºC but germination will be faster and more certain at 20ºC to 24ºC. Tomato crops want a daily average temperature around 72ºF. Even heat-tolerant tomato plant varieties slow down when the temperature soars. If tomatoes are picked at mature green, store them in 66 to 70°F with 90 to 95% RH would encourage uniform ripening. Many tomato plant problems are caused by improper greenhouse temperatures. Optimal storage temperatures depend on the maturity stage of the tomatoes. 1) Top icing the products may be very effective keeping the temperature low and the product surface close to 100% humidity. Alas, most refrigerators are cooled to around 35°F to 38°F. Figure 1; Humidity Deficit for Tomatoes at 8-9 air exchanges per hour. Below, are a few tips that can help you prepare your plants to endure the stressful heat and humidity of steamy summer weather. Tomato . Tomatoes can tolerate a night time temperature falling to 13.5ºC but if the daytime temperature falls below 15ºC for a week or more, growth will be stunted at best and crops reduced. Varieties slow down when the temperature low ( evaporative cooling ) and the surface 100 %.! To endure the stressful heat and humidity of steamy summer weather daily temperature... % RH intensity of red color and reduce fruit shelf-life picked at mature green, them! Layer of straw, compost, or grass-clipping mulch helps moderate soil,... 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