The common deformed fruit in greenhouses include many heart-shaped fruit, empty fruit, cracked fruit, rotted fruit, and sun-dried fruit. The reasons for the formation of malformed fruit are: 1) Excessive application of nitrogen fertilizer during seedling stage, overgrowth of shoots, and imbalance of crown and root ratio; 2) Nutrients consumed by tomato respiration when continuous flowering (6°C to 8°C) is encountered during flower bud differentiation. Relatively reduced, the accumulation of flower nutrients in the increase, the number of carpels formed more easily form more than ventricular malformation; Third, plant aging, when the temperature is low, poor light, flower and fruit can not be normal development, easy to form apex; four It is a high temperature in the shed, high humidity, lack of light, pollen abortion, poor fertilization, fruit pectin content is small, easy to form empty fruit; five is the lack of calcium in nutrients, easy to form cracking fruit and umbilical rot fruit; Sixth, when hormones are used in improper concentration, or when the growth of the plants is weak, empty fruit or yoghurt can also be produced. Seventhly, the removal of old leaves is too much, and it is easy to form sun-burning fruit and poorly colored fruit.
In order to increase tomato yield, improve fruit quality, and reduce the formation of malformed fruit, the following technical measures should be taken:
First, do a good job of fertilizer management in the early period of tomato to control the amount of nitrogen fertilizer application, flowering fruit setting period must be balanced application of nitrogen, phosphorus, potassium fertilizer, increase boron and calcium fertilizer. During the peak period of fruit setting, 0.5% calcium superphosphate solution or 0.7% calcium chloride and 0.005% naphthalene acetate solution can be sprayed 2 to 3 times, which can effectively prevent the production of rot and fruits. Water well to prevent excessive humidity or dry soil.
Second, the insulation brightness and anti-freezing cold wave coming, we must promptly stamped straw or in the greenhouse to take low bow film insulation to prevent freezing damage. When the weather is fine, we must uncover the straw curtains, increase the light area as much as possible, increase the photosynthetic intensity and photosynthetic efficiency, and do so.
Third, scientifically controlling the growth and development of fertility tomato plants can be controlled by humans. First, when the seedlings grow too profusely, 75 mg/kg paclobutrazol solution can be sprayed to control the length. Second, reasonable pruning buds, sparse flowers, timely removal of deformed young fruit. When topping, two young leaves should be kept at the top of the heart to protect the fruit from burning. Third, rational use of hormones to protect the fruit, the concentration should not be too high, and do not repeat application.
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