EFFECT OF AMMONIUM NITRATE AND POTASSIUM HUMATE ON VEGETATIVE GROWTH AND CHEMICAL CONSTITUENTS OF CALOTROPIS PROCERA PLANTS.

The present work aimed to study the influence of three gradualrates of nitrogenous fertilizer (ammonium nitrate; NH4NO3) and potassiumhumate at four doses and their interactions on vegetative growth and chemicalconstituents of Calotropis procera plants. The obtained results showed that allmorphological characteristics i.e. plant height, stem diameter, number ofbranches and leaves per plant, leaf area per plant, plant fresh and dry weights,root fresh and dry weights were inceased by application of different rates ofNH4NO3 and potassium humate fertilizer or their combinations. Also, plantstreated with NH4NO3 and potassium humate fertilizers showed a significantincrease in the contents of chlorophyll A and B, carotenoids, totalcarbohydrates(%), N%- P%- K% and total alkaloids of Calotropis proceraleaves as compared untreated (control) plant. While total phenolic and totalflavonoids contents were decreased with fertilization by different rates ofNH4NO3 and potassium humate. The highest values of total phenolic and totalflavonoids contents were obtained with applied the lowest fertilizer rates ofNH4NO3 (1g/ plant) and potassium humate at zero level.