How to fertilize celery scientifically?
How to fertilize celery scientifically? 1. Characteristics of fertilizer requirement: the nutrient absorption of autumn sowing celery was high in the peak period of vegetative growth, and the absorption of nitrogen, phosphorus, potassium, magnesium and calcium accounted for more than 84% of the total absorption. Celery needs the highest amount of nitrogen, followed by calcium and potassium, followed by phosphorus and magnesium. Celery also has a large demand for boron. In boron-deficient soil or when absorption is inhibited by drought and low temperature, the petiole is easy to crack, that is, "stem folding disease", which seriously affects the yield and quality. 2. Fertilization technology: under the medium fertility level, the amount of fertilizer applied to celery during the whole growth period is 2500ly3000 kg of farm manure (or 350ly400kg of commercial organic fertilizer), 16kg of nitrogen fertilizer, 5-6kg of phosphate fertilizer, 6-9kg of potash fertilizer, nitrogen and potash fertilizer is divided into base fertilizer and three times topdressing, the proportion of fertilization is 2, 3, 3, and 3, all phosphate fertilizer is used as base fertilizer, and chemical fertilizer and farm manure (or commercial organic fertilizer) are mixed. Base fertilizer: 2500-3000 kg farm manure or 350-400 kg commercial organic fertilizer, 4-5 kg urea, 11-13 kg diammonium phosphate and 4-5 kg potassium sulfate per mu. Topdressing: urea 6-8 kg and potassium sulfate 3-4 kg per mu in the heart leaf growth period after slow seedling, 8-11 kg urea and 3-5 kg potassium sulfate per mu in the early stage of vigorous growth, and 6-8 kg urea and 3-4 kg potassium sulfate per mu in the middle stage of vigorous growth. Extra-root topdressing: if heart rot is found, foliar spraying can be done with 0.3%-0.5% calcium nitrate or calcium chloride. Foliar application of boron fertilizer can avoid stem cracking to a certain extent, spraying 0.2% borax or boric acid solution 40kg / mu each time. Protected cultivation can increase the application of carbon dioxide gas fertilizer. More celery planting techniques
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What is the cause of celery petiole cracking?
Celery soft rot does great harm, how to effectively control celery soft rot? The prevention and control methods are as follows: 1. Crop rotation. Celery soft rot is mainly transmitted through soil, and a large number of bacteria are easy to accumulate in the soil of continuous cropping land, which is bound to cause and aggravate the disease. Therefore, the round should be carried out for more than two years.
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How is celery rotten heart to return a responsibility? How to prevent and cure?
What is celery Fusarium wilt should be how to prevent and cure? 1. Disinfect with disease-free seeds or seeds. The mother plant should pay attention to the selection of disease-free petiole, stem and leaf so as to avoid carrying bacteria. The use of old seeds for more than 2 years has a certain disease prevention effect. Use the new seed of the first year must carry on the seed disinfection, can use 48Mel 4.
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