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Fertilizers Many questions have been raised concerning the use of fertilizers why plants require them and about the benefits they bring Fertilizers have a significant effect on humanity as they form the basis of food production The addition of fertilizers assists enrichment of soil fertility and corrects nutrient deficiencies so that plants can grow more healthily provide crops and food for people and increase food production In this way fertilizers are socially relevant Fertilizers are used to improve the productivity and growth of plants they can either be natural or manufactured chemical substances In order to grow plants necessitate carbon dioxide from the air and water and essential elements from the soil The latter are obtained by absorption through the roots of plants however if the soil is depleted of a specific nutrient fertilizer is added to overcome these deficiencies When plants are lacking in a particular nutrient ie when it is unable to attain enough of that specific nutrient from the soil for proper development abnormal plant growth can occur The Chemical Properties The three predominant elements in applied fertilizers are Nitrogen Phosphorus and Potassium Fertilizers are identified according to the percentage of composition of these three elements respectively Actually the amount of phosphorus and potassium in a fertilizer ie indicated on the fertilizer bag is usually representing the amount of phosphorus pentoxide P2O5 and potassium oxide K2O that is present For example 5-8-7 indicates a fertilizer containing 5 nitrogen 8 phosphorus pentoxide and 7 potassium oxide Therefore it would be more accurate to say that fertilizers consist mainly of nitrogen phosphorus pentoxide and potassium oxide To simplify matters they are thought of as just phosphorus and potassium Some fertilizers do not even contain P2O5 and K2O but they do contain phosphorus and potassium and so its label would be representing the amount of P and K that is in the fertilizer if it were in the form of P2O5 and
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