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...Plant nutrients required for growth are divided in macronutrients primary secondary and micronutrients based on the quantities of needed addition to these also needs hydrogen oxygen carbon which acquires from air water other elements with a role nutrition nitrogen n calcium ca iron fe sodium na phosphorus p sulfur s manganese mn cobalt co potassium k magnesium mg zinc zn vanadium v copper cu silica si boron b aluminum al molybdenum mo barium ba chlorine cl nickel ni titanium ti photo credit scot nelson essential chemical form assimilated average content ho o nh no hpo so ppm hbo oh moo parts per million ph is measure how alkaline or acidic soil this important because affects availability nutrient may be present but it not available plants reactions caused by conditions between optimal range where most use if amended lime soils gypsum can used sodic high alkalinity tests efficient only do they show levels characteristics such as percent organic matter cation exchange capacity c e i good...