Tomato fruit set, fruit expansion period, is in a period of strong demand for water and nutrients, the need for roots to absorb enough water and nutrients to supply plants. Rainwater entering the shed first results in a decrease in the respiratory and absorption functions of the root system. Because the temperature of the rainwater is lower than the soil temperature, the tomato root system is cold after the rain, and the cells shrink or burst, and the absorption is inhibited. Therefore, after the rain enters the shed, the plants are prone to wilting, especially after the rain is fine, the light intensity is strong, and when the transpiration is vigorous, the tomato plants exhibit symptoms of acute wilting.
After the rainwater enters the shed, the air humidity and the soil moisture in the shed are very large, causing a phenomenon of “inner guilt†in the shed. The hot and humid environment in the shed after sunny days is very conducive to the occurrence and spread of diseases, such as root rot and bacterial wilt and other root diseases and bacterial soft rot and epidemics. Due to the infection of diseases, the phenomenon of death of tomatoes is severe and prevention and control should be strengthened.
Prevention:
(I) Prevent disease in a timely manner
When rainwater enters the shed, it is first necessary to pour roots and prevent root diseases. It can be used for Jin Lei (Raydoer Mn Zn) 600 times solution or Prec 600 times solution, and can also be used to root 1-2 times with chlorothalonil (salt-aluminophosphate) or ank manganese zinc 1000 times, focusing on the prevention of tomato diseases Stem rot and Phytophthora root rot. Prevention of leaf disease can not be ignored, you can spray foliar benziconazole (Amisida) 1500 times or chlorothalonil (Dacron) 600 times, you can also spray Dasheng or polymycin (Treasure Li An) etc. It is advisable to perform both foliar spraying and irrigating at the same time in order to control the occurrence and spread of these infestation diseases after rain and reduce the occurrence of dead tree phenomenon.
(b) watering or not, depending on the circumstances.
For the "water pouring garden" (ie water pouring after the rain), it should be treated differently.
After the rain, depending on the situation in the shed, a single well water can be quickly poured under conditions with little accumulated water in the shed, which has obvious effects on relieving the loss of crop root absorption and the lack of water supply. But this time watering should pay attention to the use of rooting agent or rooting fungus fertilizer, such as roots, roots, Hong Kong and Thailand rooting powder, etc., to promote the germination of new roots and the recovery of injured roots.
If there is a lot of accumulated water in the shed after the heavy rain, it is best not to “pour a garden†so as not to increase the degree of damage to the root system. The main measures should be drainage and prevention of diseases. The specific measures are as follows:
First of all, on the basis of disease prevention, ploughing should be carried out to increase soil permeability in order to facilitate the conduct of root respiration and eliminate excessive moisture in the soil as soon as possible.
Second, it is necessary to take appropriate measures to shade it. After transpiration, the evapotranspiration of the leaves increased, the plants were susceptible to acute wilting, and severe wilting could not be restored. The straw can be properly pulled or shade nets can be covered to make the tomato slow to see light, slow down the transpiration and ease the wilting.
Moreover, although the humidity in the greenhouse is relatively large, the absorption of the root system is very small, so the ventilation and dehumidification must not be overly urgent. It should be performed slowly according to the weather conditions to prevent the plants from losing their water due to acute water loss.
Finally, wait until the soil conditions permit, then pour one or two wells of water for salt pressure.
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