In winter, in the process of using solar greenhouses to produce celery, hollow phenomenon often occurs, resulting in deterioration of the quality of celery, production decline, greatly reducing the commercial quality of celery, directly affecting the income of vegetable farmers. Here are the reasons for the hollow celery and the prevention and treatment methods.
One, cause
1. Caused by low temperature and ultraviolet illumination. In the greenhouse production in winter, if it encounters low-temperature illumination or suffers from freezing injury, photosynthesis of the celery leaves will be weakened, and the absorption and operation of nutrients and moisture in the root system will be hindered and hollow.
2. Caused by high temperature and drought. When encountering high temperature, drought, and low humidity environment conditions, it often causes the occurrence of a hollow disease. High temperature can accelerate the differentiation of plant tissues, and low humidity can not meet the plant's need for water, so that the pith tissue of the plant is decomposed, resulting in hollow celery and increased fiber.
3. Caused by improper water and fertilizer. The roots of celery have weak fertilizer absorption capacity and strong fertility, requiring more comprehensive fertilizers. Nitrogen dominates during the whole growing season. The deficiency of the previous phosphorus fertilizer will often be detrimental to the differentiation and elongation of the leaves, resulting in thin and thin seedlings. Potash fertilizer plays a very important role in the transportation of nutrients in the middle and later stages, stout, full and shiny. In the peak period of growth, if the fertility required for the growth of celery is insufficient or lacks water, the growth is inhibited and the petiole will be hollow. If the soil is dry or excessive nitrogen fertilizer will hinder the absorption of trace elements boron and calcium, celery is sensitive to boron, when the plant lacks boron, petioles will be longitudinally cracked, the heart leaves brown cracking, calcium deficiency is easy to induce heart rot.
Second, prevention and control measures
1. Science watering. In order to avoid the hollow phenomenon, we should first scientifically water. In production, vegetable farmers often worry about the decline of soil temperature due to frequent watering, which will affect the normal growth of celery, resulting in insufficient celery growth. In fact, as long as the watering is appropriate, it will not affect the normal growth of celery. Usually watered once every 15 days, the amount of water should not be too large, you can pour water. In particular, during periods of vigorous growth, sufficient water supply must be ensured and water must be poured 15 days before harvest.
2. Regulate temperature. Celery is a kind of cold-resistant vegetable. It requires cold and humid environment. Celery cultivation is conducted in the greenhouse. The daytime temperature is 15°C-23°C. The maximum temperature should not exceed 25°C. It should be kept at about 10°C at night to reduce nutrient consumption and avoid hollowness. However, the temperature should not be lower than 5 °C, otherwise it is prone to frost damage and convulsions.
3. Fertilizer management. Based on the application of base fertilizer, the top-dressing fertilizer in the growing season is mainly available nitrogen fertilizer, and with the application of potassium fertilizer, the application amount is 20-25 kg per application and it is chased once every 15 days. To prevent hollowing, spray with 0.3%-0.5% borax solution.
4. timely harvest. The celery planted in the greenhouse cannot be harvested too late. When the harvesting period is too late, it often results in the aging of the petiole, the ability of the leaf photosynthesis to decline, the capacity of the root to absorb nutrients will also be weakened, and the lack of nutrition will cause the parenchyma cells to rupture and cause Hollow phenomenon occurs.
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