In the production of celery, the unfavorable conditions such as temperature, drought, lack of fertilizer, and pests and diseases will cause the roots of celery to lose their ability to absorb water. The above ground will not receive sufficient nutrients, the physiological functions of the leaves will decline, and the nutrients produced will be insufficient. Petiole close to the pith of the parenchyma, the first loss of rupture and atrophy, resulting in the hollow pith cavity to form a hollow. After the hollow celery cellulose increases, the quality deteriorates, the yield decreases, and the commercial quality of celery decreases, which in turn affects the income of the vegetable grower. It is hoped that the farmers will pay attention.
Incidence conditions: Hollow celery is a phenomenon of physiological aging, occurring mostly in sandy soils and other thin soil plots. Inappropriate varieties can cause hollow; insufficient basal fertilizer or insufficient topdressing can induce hollow; soil drought, celery frost damage or with high temperature, fat burning roots will appear hollow; if the harvest is too late, the root absorption capacity is reduced, malnutrition, stem pulp Part of the cell rupture, loose tissue, but also make the petiole aging and hollow.
The following precautions should be taken during planting:
1. Select good varieties with high purity and good quality solid celery fine varieties, such as Four Seasons Celery, Bailey Celery, Ventura, Jinnan Shiqin No. 1, American Celery and so on.
2. Choose soils that are rich in organic matter, have good water retention and fertility, and have good drainage and irrigation conditions. According to the determination, in the same situation of fertilizer and water, the disease is easy to occur in places with strong alkalinity, high viscosity, heavy sand, and serious diseases and pests.
3, balance fertilization apply enough base fertilizer, spread evenly, per acre Shi quality decomposed organic fertilizer about 5,000 kilograms, it is best to add fermented chicken manure 100 to 200 kilograms, or about 15 kilograms of diammonium phosphate; after planting seedlings Shi Ti Miao Fei, about 10 kilograms of ammonium sulphate per acre with water, or fermented manure. During the growing season, top-dressing nitrogen fertilizers are mainly used. In combination with potash fertilizer, about 20 kilograms per acre is applied at a time, and fertilizer is applied once every 15 days or so.
4, control temperature and temperature not too high, celery like cold and cold climate, is not sensitive to low temperature response. Therefore, the temperature in the winter greenhouse is generally maintained at 15 to 18 °C. If you want to mention the morning market, the temperature should not exceed 20°C. Otherwise, hollow phenomena will occur and quality will decrease.
5, Science Watering Planting celery in the greenhouse in winter, as long as the water is suitable, it can promote the growth of celery, prevent hollow. Generally, once every half month or so, pour water once, and the small water will slip, and do not pour water. Until the first half of the harvest, you can use the big water and pour it twice. In this way, the celery grows well and it is not hollow.
6, foliar spray borax to prevent boron hollow, available 0.3 ~ 0.5% borax solution foliar fertilizer.
7. The harvesting period of celery harvesting is not obvious. It should be harvested as long as it succeeds. If the harvest period is late, the leaf petiole will age, the ability of the leaves to produce nutrients will decrease, and the ability of the roots to absorb will weaken. At this time, the parenchyma cells in the petiole will be ruptured to form a hollow phenomenon due to aging.
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