Fertilization characteristics of corn and fertilizer application rate

Corn: For every 100 kg of corn kernels produced, 2 to 4 kg of pure nitrogen, 0.7 to 1.5 kg of phosphorus, and 1.5 to 4.0 kg of potassium are required. If the yield per mu of corn is 400 kg, an average of 40-60 kg of ammonium sulfate or equivalent of other nitrogen fertilizers per acre; 40-60 kg of superphosphate (10% to 16% of active ingredient) or equivalent Heavy superphosphate (internal component water content 36%~52%) and calcium magnesium phosphate fertilizer (active ingredient content 12%~16%); 6~10 kg potassium sulfate (active ingredient content 48%~52%) or chlorine Potassium (the active ingredient content is 50% to 52%). Potassium fertilizer can also be replaced by grass ash, which is 40~60 kg per acre (dry ash, no impurities). In determining the amount of corn to be fertilized, factors such as the type of cultivation, variety characteristics, yield levels, soil and climatic conditions should be considered. Due to the small plant growth and slow growth, the nutrient absorption and utilization are also small. The growth rate of corn is accelerated when the jointing is to the heading and flowering stage. The vegetative growth and reproductive growth go hand in hand, and the absorption and utilization of nutrients are obviously increased. After that, vegetative growth is almost at a standstill, so the absorption and utilization of nutrients is greatly reduced, and it is almost stagnant.
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Centrifuge Tube Rack

At present, in the process of isolation and preparation of various stem cells from various tissue sources, Centrifuge Tubes with a volume of 15ml and 50ml are used.
It is one of the low-value consumables with high usage rate. It is generally installed on a dry foam rack with the package or in bulk. When used, it is taken out by the operator and placed on the plastic centrifuge tube rack in the ultra-clean workbench. The common centrifuge tube rack can only make the centrifuge tube stand upright. When transferring liquid or needing centrifugation, the operator should hold the centrifuge tube in the left and the night gun or aspirator in the right. If it is necessary to transfer a large amount of liquid reagents or perform gradient centrifugation operations, such as density gradient centrifugation to separate mononuclear cells, the operator needs to hold the centrifuge tube with the right hand for a long time and tilt the centrifuge tube, which often causes the operator's wrist joint pain. At the same time, it will also affect the liquid superposition effect, which will easily lead to the mixing of liquids of different densities, resulting in the failure of the experiment.

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