The hollow of celery is a kind of physiological aging phenomenon. It starts from the base of the petiole hollow and gradually develops upwards. The white floc-like corked tissue appears in the hollow part. Especially in the middle and late period, high temperature and drought, insufficient fertilizer, pests and diseases, lack of supply of fertilizers and water, lack of boron, and late harvesting will reduce the ability of celery roots to absorb fertilizer and water, and the ground will not be adequately nutritious. Falling, the manufacturing of nutrients is insufficient to form hollow rods. It will have a great influence on its output and quality, which will result in a reduction of commercial and economic value.
First, the cause of the hollow
1. Insufficient temperature and light or frost damage in protected cultivation
2. In open cultivation, high temperature and drought are the major causes of hollowness.
3, improper management of water and fertilizer will cause hollow.
4. Under the same conditions of fertilizer and water, the soil is salty and alkaline, and the soil is more likely to be hollow when the soil is more viscous or sandy and the pests and diseases are serious.
Second, prevent hollow measures
1, choose a good variety
2, choose suitable land planting. Soil pH is better with neutral or slightly acidic.
3, adjust the appropriate temperature. The growing environment requires cold and moist, greenhouse cultivation celery, the daytime temperature of 15 ~ 20 °C is appropriate, the maximum does not exceed 25 °C. Keep around 10°C at night, not below 5°C. Usually appropriate ventilation, reduce air humidity.
4, timely and appropriate water and fertilizer management. The base fertilizer is sufficient, and the spread is uniform. About 5,000 kg of organic manure is cooked per acre. It is best to apply 100-200 kg of fermented chicken manure or about 15 kg of diammonium phosphate. During the growing season, topdressing nitrogen fertilizer is mainly combined with potash fertilizer. If boron deficiency is found, 0.3%-0.5% solution can be used for foliar spray. In the afternoon, the leaf should be wet and not drip.
5, timely control of pests and diseases, keep the leaves have a strong ability of photosynthesis, so that plants grow robustly. In addition, harvesting is also an important measure to prevent the hollow phenomenon.
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