Two fields experiments were achieved during the Nili season of 2017 and 2018 at Experimental
Farm of Faculty of Agriculture, Fayoum University, Fayoum Gornorate to investigate the effect of soil humic acid
rates (0, 25, 50 and 75 kg fed-1
), foliar zinc oxide and nanoparticles zinc oxide concentrations (50 and 100 ppm)
on tomato leaf chemical constituents and fruit quality. The interaction between soil humic acid at 75 kg/fad. and
foliar spray with zinc oxide at 50 ppm increased the concentrations of chlorophylla, b and total a+b in leaf tissues
in the 2nd season. The interaction between soil humic acid at 75 kg/fad. and foliar spray with nanoparticles zinc
oxide at 50 ppm increased vitamin c, total soluble solids and lycopen contents in tomato fruits as well as fruit
firmness.