Over the summer red tomatoes to focus on catching three points
“Improve the malignancy of red tomatoes in summer and summer, so that they cannot sell at high prices or even sell them. How can we promote the transformation of tomatoes in summer?†the reporter asked Zhang, a vegetable farmer, during an interview in Gucheng Street in Shouguang City. Road. The reporter believes that doing the following three points will promote the normal color transformation of tomatoes.
First of all, prevent high temperature disorders and promote the conversion of red tomatoes. Studies have shown that the most suitable color temperature of tomato is 24°C, but nowadays, the temperature in daytime in the arch is mostly above 24°C. After 10 o'clock in the morning and after 4 o'clock in the sunny days, the temperatures in the shed are all above 30 o C. When the temperature is highest at noon, the temperature in the shed can reach 40 o C or more, and this high temperature will affect the lycopene. Formation, but carotene can still be formed under such high temperature conditions, which will make the color of the red tomatoes yellow and fade, affecting the commercial character of the tomatoes. Therefore, vegetable farmers should try to control the temperature within the temperature range suitable for tomato color conversion during tomato color conversion. For example, use sunshade nets, cooling agents, etc. on the top of the shed to cool the tomato shade or install it on the top of the tomatoes. The spray equipment promotes the color conversion of tomatoes by reducing the temperature in the booth by spraying at a high temperature. Also note that when the shade net is used to cool the temperature, before 10:00 in the morning and after 3:30 in the afternoon, the shade net must be put away to prevent the tomatoes from seeing light and affecting the color of the tomatoes.
Second, pay attention to the use of a large number of elements in combination with trace elements. In summer, because tomatoes grow faster, they need more mineral nutrition. Especially after the tomatoes enter the color change period, many vegetable farmers are accustomed to applying high nitrogen and potassium fertilizers to promote the color transformation of tomatoes, which can easily lead to Poorly transformed tomatoes. This is because there is an antagonistic effect between potassium fertilizers and boron and other trace elements. When the potassium fertilizer is used excessively, it will affect the absorption and utilization of boron fertilizer by tomatoes, resulting in the lack of boron in tomatoes and poor coloration of tomatoes. Because the watering time of the arch sheds is about one week, if the vegetable growers continuously apply high-nitrogen and potassium fertilizers, and the tomatoes can not fully absorb and use them, the nitrogen and potassium content in the soil will be too high. Therefore, it is recommended that the farmers should pour water three times. Chong two fertilizers, or the original each time the application of water-soluble fertilizer about 5 kilograms of the amount can be reduced to about 3 kg, but also pay attention to foliar spray boron and other trace elements in fertilizers to promote tomato color.
Again, prevent pests. Since the spring of this year, the amount of precipitation is relatively small, resulting in heavy occurrence of aphids, thrips, whiteflies, aphids, etc., and the secretions produced by these pests are likely to adhere to the fruits of tomatoes and cause mildew, resulting in the appearance of tomatoes. A layer of black mold layer, which affects the visibility of the tomato fruit, resulting in poor color rotation of the tomatoes. Therefore, vegetable farmers must also reduce the occurrence of these insect pests by using physical control methods such as blue and yellow armyworm board and insect nets. It is also possible to use avermectin, methotrexate, acetamiprid and other agents and fumigants to kill these pests, so as to reduce the impact on tomatoes and promote the conversion of tomatoes.
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