Umbilical rot is a common physiological disease in tomato production. The umbilical part is black and dry. It is usually caused by lack of calcium in the fruit. Usually, the content of calcium in the middle of the fruit is the least. Therefore, the symptoms appear in the middle of the fruit first and then spread to the umbilicus. Causes of Umbilical rot:
1, high temperature caused by high temperature caused by increased transpiration of the leaves, making a lot of calcium into the leaves, and high temperatures and accelerated fruit enlargement, the fruit into the calcium is relatively reduced, it is easy to cause umbilical rot.
2. Absorption of calcium caused by drought is passively absorbed. The amount of calcium absorbed by the plants is positively correlated with the amount of water absorbed. The matrix lacks moisture and the water absorption of the plants decreases, so the amount of calcium absorption also decreases accordingly.
3, high salinity caused by high total salt concentration will prevent the absorption of calcium. As the conductivity increases, the incidence of umbilical rot also increases. Different species have different sensitivities to high salinity.
4. The low temperature influences the rhizosphere temperature to be too low, and the root system is slowly metabolized, affecting the absorption of water and calcium, thereby causing the disease.
5, potassium, magnesium, ammonium supply too much elements have a competitive relationship between the content of potassium, magnesium, ammonium ions in the soil is too high, will affect the absorption of calcium.
6, too little calcium for soil or water culture nutrient solution calcium concentration below 100ppm, there will be a large number of fruit of the umbilical rot. Therefore, the calcium concentration must not be lower than 100 ppm.
7. The impact of low PH value PH value is too low, then affect the absorption of calcium, in the PH value of 5.6-8 conditions, the effective content of calcium increases with the PH value.
8. The passive absorption of calcium caused by high humidity depends on the transpiration of the leaves. When the humidity is too high, the transpiration is smaller and the amount of calcium absorbed by the plants is reduced.
For these reasons, prevention of tomato umbilical rot can take the following preventive measures: (1) maintain good ventilation and light conditions, reduce humidity. (2) The rhizosphere temperature during the result period was maintained at 18-20°C. (3) Control the uniform humidity. (4) Maintain soil pH greater than 5.5. (5) Once umbilical rot occurs in production, 0.4% calcium chloride solution can be sprayed on the young fruit in time, which has a good effect on the treatment of calcium-deficiency tomato umbilical rot.
Offering Chinese 100% pure and natural Fennel Honey new crop in bulk packages 290kg steel drums.
Fennel honey is a kind honey that the production is not much in Gansu, China. China is also the only producing area of fennel honey. Fennel honey is an amber, bitter taste honey. Native people are offen use it for the medicine use.
Fennel Honey
Fennel Honey,Fennel Honey Prices,Pure Fennel Honey
Ningxia Natural Honey Product Technology And Development Co., Ltd. , https://www.nxhoney.com