On todays episode we are going to talk about Organic Fertilizers and what and how to calculate NPK. According to Colorado State University an organic fertilizer refers to a soil amendment derived from natural sources that guarantees, at least, the minimum percentages of nitrogen, phosphate, and potash. Examples include plant and animal by-products, rock powders, seaweed, inoculants, and conditioners. By definition these products have to guarantee at least a known amount of Nitrogen Phosphorus and Potassium or NPK So what is NPK? NPK refers to the percent weight of that Nitrogen Phosphorus and Potassium makeup of the material in question. Generally the industry standard is to consider include the entire weight of the organic molecule as a part of this weight. Using Nitrate as an example the % weight includes the Nitrogen and three Oxygen atoms that make up N03 Nitrogen is available in three forms. Ammonia, Nitrate and Nitrite. NH3 NO3 and NO2 Phosphorus is most commonly found in P2O5 and Potassium in K2O. So if you have results that represent the elemental numbers such as the lab results we have been presenting recently you will have to convert them to generate your NPK numbers so that you can compare then. The first step to do this is to figure what percent the N P and K make up of their organic forms. This is done using the atomic weight of the element in questions. The atomic weight generally represents the weight of the individual of each atom. Each atom on the periodic table has a different weight. Meaning for K2O there is one oxygen and two potassium atoms to total weight of K2O is: Total weight: (39.10*2) + 16 = 94.2 In order to figure out what % the nitrogen is simply divide potassiums combine atomic weight by […]
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