The high temperature is the culprit that causes tomatoes to fall. It is often found in summer vegetable shelters, especially at high temperatures of 32°C at noon. As we all know, in the winter and early spring cultivation, low temperature is an important factor affecting the fruit set rate of vegetables, and the same high temperature also seriously affects the fruit set rate of vegetables, and seriously affects the germination rate of pollen and pollen tube elongation rate. Therefore, pollination and fertilization are poor, and the fertilization process is disordered. As a result, a large number of flowers and fruit fall off and a large number of malformed fruits are produced. Therefore, it is necessary to strengthen the ventilation at noon on high temperatures and use shade nets to cover the cultivation.
Suitable air humidity for air drying is also very important for normal fertilization. In general, suitable air humidity is 70% to 80%, especially in the flowering fruit setting period, to maintain the ground humidity, sprayer can be used to spray water, To increase air humidity.
The lack of boron and phosphorus in some nutrient elements has an important role in promoting flower bud differentiation and increasing fruit setting rate. During flowering and fruit setting period, borax and potassium dihydrogen phosphate solution can be sprayed on the leaves. It is important to increase calcium fertilizer during the fruitful period to enhance plant resistance, improve pollination performance, improve fruit quality, and prevent physiological diseases such as umbilical rot, sunburn, and bud blight. In high temperature and dry season, increasing potassium fertilizer can improve drought resistance and heat resistance of plants.
Cultivating strong seedlings to cultivate age-appropriate seedlings has an important effect on enhancing plant resistance and increasing fruit setting rate. Flower bud differentiation at the seedbed stage directly determines the fruit setting rate of 1-2 seedlings after planting. Now is in the nursery period, to use shade nets, insect nets to cover, in order to reduce the seedbed temperature, in the middle and late can be sprayed potassium dihydrogen phosphate solution, depending on the plant growth decided to spray foliar booster to control plant leggy.
High temperatures, long days of high temperatures, and long days can produce large amounts of gibberellin at plant growth sites. It is easy to make the internodes grow too long and the nutrient grows excessively, resulting in falling fruit. In addition to control the amount of nitrogen fertilizer, increase phosphorus and potassium fertilizer.
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