Tomatoes need to drop two defenses during the hot season
Currently in the hot season of tomato production, if farmers do not understand the relevant management techniques, blindly relying on subjective awareness of tomato production management will often cause greater losses. Should pay attention to "one down two defenses":
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1. When the water spray is cooled and the temperature is high, the edge of the blade is burnt, and when the chlorophyll is fading, the whole leaf is dry. The prevention and treatment method is: while using the sunshade net, the sprayer can also be used to cool down the water. Especially at 11-14 noon, pay attention to when the temperature is higher than 35 °C or 40 °C for 4 hours, it is necessary to take measures to cool down in time. Control stem and leaf damage and fruit abnormalities.
2, prevention and control of falling flowers If the daytime temperature is too high, more than 34 ° C, night is higher than 20 ° C, or daytime continuous high temperature 40 ° C for 4 hours, the style elongation is significantly higher than the anther, causing the ovary to shrink, leading to the stamen Due to the inability to normal pollination and fertilization, the flowers fell. The prevention and treatment methods are as follows:
(1) Formulated fertilization technology is used to control the use of nitrogen fertilizer.
(2) Watering should be poured in small water to avoid flooding and ensure the coordination of water and temperature.
(3) When pollination is poor, auxin spray can be used, such as 2,4-D, etc., spray or smear as required.
3, to prevent 2,4-D phytotoxicity with 2,4-D smudge has become a common method, but often the vegetable farmers do not control the concentration, causing the crop to suffer phytotoxicity. The concentration ratio is: the temperature after colonization is 15-20 ° C, the concentration is 10-15 mg / kg (that is, 1 ml 1.5% 2,4-D plus 1 kg water is formulated into 15 mg / kg, plus 1.5 kg water is used Into 10 mg / kg). After the temperature rises, it can be reduced to 6-8 mg / kg. Note: Prevent direct application to the twigs or young leaves when using; do not spray; if the amount of flowers in the field is large, you can use the anti-falling 25-40 mg / kg spray. 