Recently, a disease often occurs on tomatoes. The umbilical portion of the fruit is cracked, but it does not rot. The seeds inside the fruit are exposed, causing the fruit to fall, causing the commerciality of the tomato fruit to decrease and the yield of the tomato to be affected. . This problem mainly occurs in the first sheds cultivated in summer or early autumn and the tomatoes in the second shed, among which the tomatoes with powdered fruits have a higher probability of such phenomena.
First, the cause analysis:
Tomato fruit umbilical cracking Dew seed is a physiological disorder associated with high temperatures and strong sunlight. High temperature and strong light affect the flower bud differentiation of tomatoes. It is generally believed that tomatoes will appear under daylight when the temperature exceeds 35 degrees Celsius for a long time. Poorly differentiated flower buds, deformed flowers and deformed fruit, at the same time high temperatures can also lead to the emergence of tomatoes can not be normal pollination; In addition, the appearance of tomatoes is also related to the improper supply of fertilizer and water, lack of boron and calcium deficiency, boron deficiency caused by floral dysplasia , Calcium deficiency will exacerbate fruit cracking; Third, it is too late, resulting in poor fruit development and fruit cracking.
Vegetable farmers often think that it is related to the point of anther. In fact, the concentration of anthers does not have a direct relationship with the emergence and dehiscence of this umbilicus, but it will affect the fruits and fruit set rate. It usually occurs on the first to the second ear of the tomato plant. It is not contagious, and the fruit of a few spikes sitting on top of it does not generally appear.
Second, the solution:
1 suitable shade. If there is high temperature and strong sunshine, shade nets can be laid on the shed to reduce the temperature inside the shed and reduce the light. It is also possible to throw mud on the shed and the effect is good. Or spray the cooling agent or architectural paint on the greenhouse to reduce such problems.
2 spray leaf fertilizer. Tomato plants in greenhouses can be sprayed with foliar fertilizers containing boron and calcium, such as boric acid, instant boron fertilizer, green Fenwei 3, Kangpu liquid calcium and other foliar fertilizers, in order to promote the normal growth of tomato normal fruit and fruit growth.
3 Reasonably increase the organic fertilizer and reduce the application amount of chemical fertilizer. Organic fertilizer can not only provide comprehensive nutrition for crops, but also has long-term fertilizer effect. It can increase and renew soil organic matter, promote microbial reproduction, improve soil physical and chemical properties and biological activity, and promote the absorption and utilization of various nutrients by crops. To reduce the application of chemical fertilizers such as diammonium, compound fertilizers, urea, etc., and to increase the use of potassium fertilizers such as high-potassium compound fertilizers such as potassium hydrosulfite compound fertilizers or chelated eco-complex fertilizers from the United States, or The application amount of potassium nitrate can increase tomato's resistance to bad environment.
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