Garlic is a string-like fibrous root, the ability of water-absorbing fertilizer is weak, and the bulb grows and expands in the soil. Therefore, garlic should be cultivated with loose soil, good drainage and rich organic matter. The plots of cultivated garlic are ploughed and ploughed immediately after harvesting of the former sorghum crops, and they are re-grounded before planting. The ratio of nitrogen, phosphorus and potassium in garlic is 1:0.25:0.9, and the nitrogen requirement is the highest. Garlic fertilization varies according to the method of harvesting the object.
1. Take garlic seedlings as the harvesting object before planting with 1000-1500 kg of organic fertilizer as the base fertilizer. When the garlic seedlings are unearthed 3.3-3.6 cm, the top dressing starts. After every 10-15 days, the manure is excreted 500-800 kg every 10-15 days. , a total of 2-3 times.
2, with garlic and garlic as the harvest base fertilizer application of organic fertilizer 1000-1500 kg, urea 2.5 kg, superphosphate 20-25 kg, grass ash 50 kg, topdressing in addition to seedling application, before the winter to be applied again 1 time After the spring of the second year, it is necessary to reapply 1 time of topdressing, and generally apply 10-15 kg of urea per mu. After the garlic is inflated, it is not advisable to apply rich manure.
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Precision Grinding And Polishing Machine
Ultra-precision cutting Ultra-precision cutting refers to the cutting method whose surface roughness is less than Ra0.04μm. The key problem in ultra-precision machining is that the thin surface layer of 0.1μm is cut in the final step. This requires both an extremely sharp tool with a radius of the blunt circle of the tool at the nanoscale and a tool with enough durability to keep it sharp. At present, only diamond tools can meet the requirements. In ultra-precision cutting, the cutting speed should be very high and the cutting amount should be small to ensure that the residual area on the workpiece surface is small, so as to obtain minimal surface roughness
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