Celery Hollow Cockroach Prevention

The celery hollow is a physiological aging phenomenon, which occurs mostly in sandy soils and other thin soil plots. Insufficient basal fertilizer or inadequate top-dressing can induce hollow; soil is dry, celery is chilled, and the roots of fertilizers are hollow. If the harvest is too late, the root absorption capacity will be reduced, malnutrition will occur, and the stem marrow cells will be broken and the tissue will be loose. Petiole aging and hollow. During the cultivation process, the following measures should be taken into account:

1. Variety selection. When planting, it is necessary to choose pure and good quality stalk varieties.

2. Lot selection. Soils rich in organic matter, strong water retention and fertility, and good irrigation and drainage conditions are appropriate. The soil acidity or alkalinity is better with medium or slightly acidic soils, and clay and sandy soils should not be planted.

3. Temperature adjustment. Celery is cold-resistant vegetables, requires cold and humid environmental conditions, celery greenhouse cultivation, the daytime temperature of 15 °C ~ 23 °C is appropriate, the maximum does not exceed 25 °C, at night to maintain about 10 °C, in order to reduce respiratory consumption, avoid hollow, But do not lower than 5 °C, otherwise prone to frost damage and early convulsions. Usually create ventilation, in order to reduce air humidity, reduce disease, so that the petiole is full of hypertrophy.

4. Water and fertilizer management. The base fertilizer is sufficient and applied uniformly, and 5000 kg of organic manure is applied per acre. It is best to apply 100 to 200 kg of fermented chicken manure or 15 kg of diammonium phosphate. After planting the seedlings, the seedlings will be applied with 10 kg of ammonium sulfate per mu or fermented human feces and urine. During the growing season, top-dressing nitrogen fertilizer was the main fertilizer. In combination with potash fertilizer, 20 kg per mu was used and topdressing was performed once every 15 days. After spraying "920", it is necessary to top-dress fertilizer and water, and it is not necessary to remove fertilizer, to take measures for pouring water in small quantities, and to pour fertilizer and ground. To prevent the lack of boron hollow, 0.3% ~ 0.5% borax solution can be used for foliar spray.

In the growth process of celery, especially in the middle and later stages, such as high temperature, drought, fertilizer, pests and other factors, will make the celery root water absorption capacity decreased, the ground does not get adequate nutrition, leaf physiological function, manufacturing Lack of nutrients. In this case, the petiole close to the pial wall tissue, the first loss of rupture and atrophy, resulting in the hollow cavity of the pith to form a hollow. Under normal circumstances, the higher the temperature and drought, the more serious the hollow phenomenon. For this reason, in addition to properly planting seedlings after planting, water and fertilizer must be rushed before and after vigorous growth. In particular, regular watering is required to keep the soil moist.

5. Timely harvest. The harvest cannot be too late. If the harvest period is late, the petiole will age, the ability of the leaves to produce nutrients will decrease, the root absorption capacity will be weakened, and the nutrition will be insufficient. This will cause the parenchyma in the petiole to break and cause a hollow phenomenon.

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