According to the call from vegetable farmers recently, each year, shed celery will be hollow, which not only affects the quality and taste of the product, but also affects the economic benefits. People say that “the hollow of celery is caused by severe cold damage, and the celery is hollow because of itâ€, but this winter’s weather is so warm – it still can be a hollow phenomenon in a large area. What is going on here? What measures should be taken to prevent the celery hollow?
The hollow symptom of celery refers to the upward development from the base of the petiole, and a white floc-like corked tissue appears in the hollow part. The celery hollow is not only a hollow phenomenon caused by freezing damage, but also related to the supply of fertilizer and water: If the growth period is short of water and fertilizer, the supply of fertilizer and water is not uniform - especially in the case of late defertilization, it is often easy to cause hollow phenomenon; excess fertilizer, dry surface , low temperature, late harvest, spray gibberellin concentration is too large, too many times, lack of boron and calcium deficiency caused by abnormal growth point growth and other factors can also induce hollow celery, the solution should start from prevention.
For this reason, the following measures can be taken to prevent celery hollow:
1. Choose suitable plots for planting. Soil pH is preferably neutral or slightly acidic. Alluvial soils and sandy loam soils are suitable.
2. Use fine varieties, such as American celery, Tianjin solid celery, and Ventura.
3. The growing environment requires cold and moist, and celery is a semi-cold vegetable. Appropriate temperature during growth is 15-20 °C, not heat-resistant, high temperatures above 26 °C will hinder the growth, quality deterioration, and prone to hollow, about 10 °C slow growth. Seedlings can tolerate low temperatures of 4-5°C, and adult plants can tolerate short-term temperatures of -5--8°C. At 2-5°C, celery passes through the vernalization stage in about 20 days and it will convulsions, which will significantly reduce the yield and quality of the product. Because the celery plant is frozen, the petiole will be hollow due to the rupture of parenchyma cells, so the celery in the greenhouse must be controlled at a good temperature, and the temperature should not be lower than 5 °C to prevent freezing damage and convulsions.
4. Appropriate amount of fertilizer and water management. The base fertilizer should be applied adequately and applied uniformly. Apply 100-200 kilograms of organic manure per acre or 15 kilograms of diammonium phosphate. It is best to add about 2,500 kilograms of fermented chicken manure. Miao Fei, per acre with water around 10 kg of ammonium sulfate or phosphorus nitrate potassium 15 kg. During the growing season, top-dressing nitrogen fertilizer is mainly used in combination with potash fertilizer, each time about 20 kilograms of fertilizer is applied per acre, and fertilizer is applied once every 15 days or so. Take a small water pouring, the soil moisture is maintained at 60% -80%, and pay attention to drainage flood control.
5. If symptoms of boron deficiency are found, 0.3%-0.5% borax solution can be used for foliar application and 30-40 kg mu can be sprayed for 3 times. Foliage spraying should be selected as the afternoon, with the leaves wet and not as good; found that when the lighter leaves have signs of decompensation, can be sprayed with 0.1% urea liquid fertilizer or potassium dihydrogen phosphate and other foliar fertilizer. Gibberellin can promote the growth of celery, spraying in the water and fertilizer supply adequate management measures, when the celery itself is relatively thick spray, can play a role in increasing production, the application of gibberellin: spray the day before harvest, the concentration of 20 mg / Kg, when spraying gibberellin, urea and potassium dihydrogen phosphate can be added separately in the solution.
6. Timely control of pests and diseases and promote normal plant growth. Timely harvest, 80-90 days after planting is the best harvest period, it is necessary to seize the opportunity to harvest. Cucumber can not be harvested too late, the harvest period is too late, often cause the petiole aging, the ability of the leaves to decline in photosynthesis, the ability of the roots to absorb nutrients will weaken, resulting in nutritional deficiencies, the petiole of the parenchyma cells rupture, it will cause a hollow phenomenon happened.
Precaution of Infection
Luck Medical Consumables Co.,LIMITED , https://www.luckmedical.com