Celery is leafy green leafy vegetables, is Umbelliferae, two-year-old plants, cultivated everywhere, is one of the varieties of vegetable supply.
(A) Fertility and Nutritional Characteristics Celery is eaten with tender petiole or stem. Celery grows at a high density and grows quickly, requiring high fertilizer and water. According to the study, for every 1000 kilograms of celery (fresh vegetables) produced, its nutrient uptake is: N 2.55 kg, P2O5 1.36 kg, K2O 3.67 kg, and the absorption ratio of nitrogen, phosphorus, and potassium is 1:0.54:1.44. Nitrogen mainly affects the length and leaf number of celery petiole, nitrogen deficiency significantly affects leaf differentiation, and petiole aging is hollow; phosphorus has a great influence on the quality of celery, but excessive phosphorus will make the leaf blade slender and increase fiber; potassium is not only The promotion of nutrient operation can also promote petiole stout and full, with good luster, which will help increase production and improve quality.
In the early growth stage of celery, the long leaves of the hair tree are dominant, and in the middle and later stages of growth, the elongation of the petiole and petiole are the main factors. The nutrients absorbed by celery during its growth period increased with the increase of the amount of growth, and the absorption dynamics of various nutrients changed as an “S†curve. Celery absorbs nitrogen and phosphorus in the early growth stage to promote the development of the root system and the growth of leaves. The absorption of nutrients from the middle growth stage (from 4th to 5th leaves to 8th to 9th leaves stages) is mainly transferred from nitrogen and phosphorus to nitrogen. , Potassium-based, promote heart development. With the extension of the number of fertile days, the absorption of nitrogen, phosphorus and potassium increased rapidly. At the peak of celery growth (from 8 to 9 leaves to 11 to 12 leaf stages), the absorption of nutrients was the most. Celery's demand for calcium, magnesium and boron is also great. In the absence of boron or due to drought and low temperature conditions inhibit celery absorption of boron, the celery petiole prone to transverse cracking and other diseases, calcium deficiency celery can cause heart rot, thereby affecting the quality of celery.
(b) Fertilization with celery and fertilization with Honda Fertilizer. As celery is of a longer seedling age, in order to cultivate strong seedlings, the seedbed should be fertilized with organic fertilizer on the basis of 15 kg of urea per mu, 50 kg of superphosphate, 10 kg of potassium sulphate or potassium chloride, after emergence, according to the growth of seedlings. Appropriate amount of nitrogen fertilizer is applied in the middle and later stages. Honda fertilized base fertilizer and top dressing.
1. Base fertilizer. To apply base fertilizer before planting, on the basis of applying 3,000 kg of high-quality organic fertilizer, apply 35 to 40 kg of high-concentration compound fertilizer per mu, or 10 to 15 kg of urea, 50 kg of calcium sulphate, and potassium sulphate (known as potassium chloride) 10 ~ 15 kg.
2. Top dressing. Usually 2 times. After the celery colonization, the growth of the celery is slow, the nutrient absorption is low, and no fertilizer can be applied. When the plant grows 5 to 6 leaves, it enters the growth stage and the first time dressing is applied. Urea 10-15 kg per mu. After about 15 to 20 days, about 8 to 9 leaves were planted and a second dressing was performed. This time, the fertilizer should be reused and nitrogen, phosphorus and potassium fertilizers should be used in combination. The application rate of nitrogen, phosphorus, and potassium with a ratio of 1:0.5:1 to 20-30 kg of high-concentration compound fertilizer can be applied per acre. In the vigorous growing season, it is also possible to carry out topdressing such as spraying 0.5% urea solution or 0.2% potassium nitrate solution. Autumn drought is prone to boron deficiency, and can be sprayed with a 0.2% to 0.5% borax solution to prevent petiole roughness and cracking.
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