The story of superphosphate fertilizers is an interesting one. Around the turn of the 20th century, more precisely around 1905, it was discovered by agricultural scientists that a mixture of nitrogen, phosphorus and potassium or potash, when applied correctly to the soil and to plants, would vastly increase the yield of the crops. This was a stunning discovery because low crop yields are a cause of starvation, and because the commercial value of the farm and the famer could be vastly increased by increasing how much food each farmer and each acre of land can produce. So this caused quite a stir in the agricultural world, and forever changed the face of modern agriculture.
With this brief history, let us discuss how these fertilizers work and their positive and negative effects on crops, on the soil and on human health.