First, the cause of the hollow
1, in the protective cultivation, if the temperature is too low, lack of light or frost damage, resulting in decreased photosynthesis of the leaves, and the root system of nutrients, moisture absorption and operation blocked and hollow.
2, in the open field cultivation, high temperature and drought is the main cause of hollow, especially in summer day and night temperature difference is too small, more respiratory consumption, if the uneven supply of soil moisture, physiological growth during the growth of celery will inhibit the roots of various Absorption and transport of the elements not only affect the growth of the terminal buds, but also thicken the thick-walled tissues in the petiole, age the cells in the transposition and delivery tissues, and rupture the cells in the parenchyma cells.
If the harvest is too late, the root absorption capacity is reduced, malnutrition, cell rupture, loose tissue, petiole aging and hollow.
3, improper management of water and fertilizer will cause hollow. The celery roots have weak absorption capacity and strong fertilizer-resistance, and need more comprehensive fertilizers. Nitrogen fertilizers always occupy a major position during the growth period. Insufficient phosphate fertilizers are unfavorable for leaf differentiation and elongation and seedlings are thin in the early stage of growth, so it is very important to apply phosphate fertilizers at the early stage. In the middle and later stages, potash fertilizer plays a significant role in transporting nutrients, stout stems, fullness, and luster. When the fertility needed for the prosperous period is insufficient or lack of water, the growth is inhibited and the petiole will be 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. Use pure, high-quality, solid, fine varieties to buy seeds from trusted seed agencies.
2, choose suitable land planting. The sandy loam rich in organic matter, water retention and fertility, and good drainage and irrigation conditions is suitable. The pH of the soil is preferably neutral or slightly acidic, and clay and sandy soils should not be planted.
3, adjust the appropriate temperature. Celery is cold-resistant vegetables, requires cold and humid environmental conditions, celery cultivation indoors, the daytime temperature of 15-23 °C is appropriate, the maximum not more than 25 °C, about 10 °C at night, not lower than 5 °C, overcast, rain, snow , The wind temperature is lower, but not too low, to prevent freezing injury and early twitching. According to the humidity appropriate ventilation to reduce air humidity, reduce disease, can be used assimilation, reduce respiratory consumption, so that the petiole is full of hypertrophy.
4, timely and appropriate water and fertilizer management. The base fertilizer should be applied adequately and spread evenly. About 5,000 kg of organic fertilizer should be applied at a rate of 667 square meters. It is best to apply 100-200 kg of fermented chicken manure or about 15 kg of diammonium phosphate. Miao Fei, the top-dressing fertilizer during the growth period is mainly composed of quick-acting nitrogen fertilizer and potash fertilizer, each time about 20 kilograms per 667 square meters, topdressing once every 15 days or so, not de-fertilizing, taking small water and pouring, pouring and grounding measures, such as Boron deficiency was found in 0.3%-0.5% solution for foliar application. In the vigorous growing season, we should always keep the bauxite moist, do not water, the soil temperature is maintained at 60% -80%, in the summer to pay attention to drainage and flood control.
5, timely prevention and control of pests and diseases, to maintain a strong photosynthesis ability of leaves, adequate supply of nutrients needed for parenchyma cells in the petiole, so that plants grow strong. In addition, harvesting is also an important measure to prevent the hollow phenomenon.
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