Water and Fertilizer Management of celery in greenhouse

First, when the buds top the soil at the seedling stage, gently water once, and the seedlings can come out in 1 or 2 days. Keep the soil moist in the future, based on the principle of frequent watering and less watering. When the seedling height is 10 cm, it can be fertilized with water for 1 and 2 times. Second, planting and squatting seedlings should be watered frequently and gently to keep the soil moist from planting to slow seedling; after slow seedling, the amount of water should be controlled and mid-tillage (depth 1 inch) should be carried out, squatting seedlings, so that the root is tied down and the differentiation of heart leaves is accelerated. Vegetative growth period this period is the key period for the formation of yield. After the end of squatting seedlings, it is necessary to concentrate fertilizer and water to promote the vegetative growth of plants. Generally, quick-acting nitrogen fertilizer is applied immediately after squatting seedlings, and then applied 2-3 times in stages, paying special attention to applying a certain amount of potassium fertilizer, because celery is a potassium-loving vegetable. Water is watered every 3-4 days, but the amount of water is less, so that the ground temperature is too low is not conducive to petiole hypertrophy. About half a month before harvest, the whole plant could be sprayed with gibberellin 30~50ppm for 1 or 2 times, and the effect of increasing yield was better. Nitrogen deficiency in celery showed that the leaf was small and the petiole was prone to hollow and aging. Phosphorus deficiency in the early stage and potassium deficiency in the later stage had great effects on the yield and quality of celery. Liquid phosphorus and potassium fertilizer could be sprayed respectively in the earlier and later stages. In addition, celery is very sensitive to boron fertilizer, and the stem is cracked when boron is deficient, which can be controlled by applying 0.5-0.75 kg borax per mu.