First, the cause of root burning
1. Organic fertilizer does not rot. During the fertilization process, uncured organic fertilizer, especially uncured poultry and animal manure, will release a lot of heat when fermented in the soil. When the fermentation site is closer to the root system or the crop plant is smaller, the heat generated by fermentation will Affects the normal growth of the root system, causes root burning, and can cause plant death in severe cases.
2. Excessive fertilizer concentration in the soil. If too much fertilization is applied at one time, uneven fertilization, or insufficient water supply after fertilization, the soil solution concentration or local soil solution concentration will increase, causing root water backflow, causing root dehydration, and root burning symptoms.
Preventive measures
1. Apply fully decomposed organic fertilizer. Regardless of base application or topdressing, organic fertilizers must be fully decomposed, especially poultry and animal manure. If they are not fully decomposed, in addition to prone to burning roots, they may also become the source of infestation of pests and diseases, leading to the occurrence of pests and diseases.
2. Scientific application of chemical fertilizers. When applying chemical fertilizers, scientific fertilization must be carried out in accordance with the fertilizer application instructions. Do not apply too much fertilizer at one time to avoid causing root burning.
3. Do not fertilize too close to the root system. When fertilizing, it is generally about 10 cm from the root system, not too close to the root system, let alone the fertilizer directly contact the root system, so as not to cause root burning.
3. Remedial measures Once the root burns occur, the following measures can be taken to remedy.
1. Reasonable watering. For greenhouse cucumbers, if the soil humidity is not high, the soil solution concentration can be reduced by watering in sunny days to alleviate the harm. When watering, some functional fertilizers that promote rooting can be applied to accelerate the germination of new roots and enhance the growth of seedlings. Note that it should not be too large when watering, and small water should be poured in order to avoid too much watering, which will cause roots and roots and increase the harm.
2. Foliar spraying. After the roots of cucumber are burned, the root absorption capacity is affected, so you can spray fertilizer on the leaves, such as: spraying chitin + cytokinin + potassium dihydrogen phosphate to supplement foliar nutrition and alleviate the loss of absorption due to root injury Symptoms of deficiencies caused by the plant can increase plant resistance and allow plants to quickly recover.
3. Medicament irrigation. After burning roots, cucumbers are very susceptible to soil-borne diseases. Therefore, fungicides can be used to irrigate roots to prevent soil-borne diseases from infecting wounded root systems, resulting in rotten and dead trees.
4. Correct application of biological bacterial fertilizer. After the cucumber is burned, do not rush to apply biological bacterial fertilizer, especially fermenting bacteria, so as not to cause the manure to quickly release heat and exacerbate the harm caused by root burning. Wait until the cucumber returns to normal growth before applying biological fertilizer.
5. Remove critically ill plants. Plants that are severely burned and whose plants wither and die and cannot resume normal growth should be removed in time.
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