What method is used to identify controlled release fertilizers?

What method is used to identify controlled release fertilizers? Please introduce the identification method of controlled release fertilizer to identify true and false can refer to the following methods: hand rubbing is really not afraid of hand rubbing, capsule strength is good, high strength, two hands rubbing particles, the capsule does not lose color, does not fall off; fake fear of hand rubbing, poor quality or fake controlled release fertilizer because the strength can not meet the requirements of controlled release, the color fades when rubbing with both hands, and the capsule is easy to fall off. Knife cutting is really not afraid of knife cutting, the strength of the coating is very strong, after cutting with the knife, it is obvious that the thickness of the coating is very uniform, and the boundary between the coating and fertilizer is clear, just like an eggshell; fake fear of knife cutting, ordinary inferior or fake controlled-release fertilizer is cut with a knife, the thickness of the coating is uneven and uneven, and the coating production process can not meet the requirements of controlled-release fertilizer. The count is really not afraid of counting, the number of coated particles is more than 20%, and the total content of nitrogen fertilizer is more than 8%, and the release rate of total nitrogen fertilizer is less than 80% in 28 days, effectively ensuring the effect of controlled release; false fear, inferior controlled release fertilizer in order to reduce production costs, the number of particles is less than 15%, so it can not meet the requirements of national standards, can not play the effect of controlled release fertilizer. Blisters are really not afraid of blisters, soaked in clear water, really controlled release fertilizer, within a short period of time, the particles will not dissolve, and the water quality is clear, no impurities, there are bubbles around the particles. After soaking for a long time, it is necessary to use a sharp object to peel off the outer capsule. It is precisely because of the slow release effect, which is consistent with the law of fertilizer demand for crop growth, it does not grow only in the early stage and does not lose fat in the later stage, which has a good controlled-release fertilizer effect; false fear of blisters, ordinary or inferior controlled-release fertilizer is put in clear water, particles are dissolved in a short period of time, the water quality is turbid, impurities precipitate in the water, and the coating is easy to fall off after soaking. Because of the super dissolution and release or coating shedding, it is easy to burn seedlings in the early stage and easy to lose fertilizer in the later stage of growth, so it can not achieve the effect of controlled-release fertilizer. Click to get more compound fertilizer application techniques