Greenhouse cucumber salt damage and prevention method
2021-01-13 14:25:02
Due to no loss of greenhouse conditions, most of the fertilizers are absorbed by crops, and the remaining unabsorbed nitrogen, potassium, and other fertilizers are all left in the soil. Accumulation all year round will result in high soil concentrations, resulting in the accumulation of salts on the surface of the soil. Produce varying degrees of harm. Moreover, due to the higher temperature in the greenhouse, the water moves from the bottom upwards quickly, and it is easy to bring the salts contained in the soil to the surface, damaging the roots of the plants and hindering the absorption of nutrients from the roots. First, the harm symptoms. Greenhouse salt damage often causes atrophy of the cucumber shoot tip, chlorosis of the heart leaf, and inward bending of the unfolded petiole. The leaves in the center often appear as gold-rimmed, and the middle and lower leaves appear as parachutes. At the same time, the ratio of carbon to nitrogen in the plants declines after cucumber is attacked by salt, which may cause downy mildew to occur, resulting in premature plant failure and lower yield in the later period. . Second, control measures 1, irrigation washing salt: According to the characteristics of salt soluble in water, the water into the room within a short period of time to wash the soil with water, and set up the drainage ditch. Repeatedly 2-3 times to wash away the salt. 2. Adding straw fertilizer: With fertilizer and salt, in the off-season after pulling, a large amount of raw straw with low nitrogen content and high carbon content is absorbed to absorb the free nitrogen in the soil. The method can be combined with soil disinfection. The method is: After the cucumber is pulled, the straw such as cereal straw, sorghum, and corn is cut into 3-4 cm sections and evenly spread to the fields, about 1,000 kg per mu. After pouring deep water, the greenhouse is filled with soil to increase Room temperature. One month later, the film was removed and air dried. This can play a role in salt removal, fertilization, and sterilization. 3. Rational application of chemical fertilizers: Salt accumulation disorders are mainly caused by the excessive use of chemical fertilizers. Therefore, scientific fertilizer should be applied according to the planned yield and soil fertility. Generally, the application amount of ammonium nitrate in loam soil should not exceed 20 kg, and single nitrogen fertilizer should be used as compound fertilizer. Greenhouse cucumbers are usually topdressed with N and P compound fertilizers in the early stage of melliferous production, or they may pursue 1-2 times of nitrogen fertilizers and 1 time of phosphate fertilizer or potash fertilizer. In addition, the application of phosphate fertilizer in the greenhouse is preferably calcium phosphate-based calcium phosphate.
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