1. Requirements of Fertilizer: Autumn sowing celery nutrition nutrient growth period high absorption, this period of nitrogen, phosphorus, potassium, magnesium, calcium absorption of the five elements of the total absorption of more than 84%. The highest amount of nitrogen was required for celery, followed by calcium and potassium, and phosphorus and magnesium were the least. The celery's requirement for boron is also very large. In the absence of boron or due to drought-induced low temperature absorption, the petiole is prone to transverse cracking, ie, stem cutting disease, which seriously affects the yield and quality.
2. Fertilization Techniques: Fertilizer production per hectare of celery during the whole fertility level is 2500-3000 kg of farmyard fertilizer (or 350-400 kg of commodity organic fertilizer), 13-16 kg of nitrogen fertilizer, 5-6 kg of phosphate fertilizer, and 6 kg of potassium fertilizer. 9 kg, nitrogen and potassium fertilizer sub-basal fertilizers and three top-dressing fertilizers, fertilizer ratio 2:3:3:2, all phosphate fertilizers as base fertilizer, fertilizer and farmyard fertilizer (or commercial organic fertilizer) mixed application.
Basal fertilizer: Apply 2500-3000 kg of farmyard fertilizer or 350-400 kg of commercial organic fertilizer, 4-5 kg ​​of urea, 11- 13 kg of diammonium phosphate and 4-5 kg ​​of potassium sulfate per mu.
Top-dressing: After easing the seedlings, Mushi 6-8 kg of urea and 3-4 kg of potassium sulfate are applied during the growth period of the leaf; Mushi urea 8-11 kg and potassium sulfate 3-5 kg ​​in the early growth stage; - 8 kg, potassium sulfate 3-4 kg.
Root dressing: If you find heart rot, use 0.3% to 0.5% calcium nitrate or calcium chloride for foliar spray. Foliar application of boron fertilizer can avoid the occurrence of stem cracking to a certain extent, spray 0.2% borax or 40-75 kg boric acid solution per acre. Facility cultivation can increase carbon dioxide gas fertilizer.
Steel Grating
The steel grating be welded to products . Normally, hot galvanizing will be carried out after end welding process. The range PH6 to PH12.5, a stable protective film will be formed on the zinc surface, the hot dipped galvanized steel grating has good anti-corrosive property. Of course, the steel grating also have other surface treatment, for example painted and powder coated .
Steel grating can be cutting to different kinds of shape as per your special needs.
Steel grating including flat grating, 'I' shape grating, serrated grating.
In generally , the steel grating be used as stair tread, platform, fence, trench cover, ceiling, etc.
The advantage of steel grating :
firm welding
smooth surface
high strength
Steel Grating,Stainless Steel Grating,Galvanized Steel Grating,Hot Dipped Galvanized Steel Grating
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