The present work was carried out in field experiment at Ghazala Farm, Zagazig, Sharkia Governorate to study the effect of foliar application of Zn and Cu on the grain yield and some biochemical constituents of corn grains. The results obtained revealed that:-
The yield of corn grains was increased by the foliar application of any treatments from Zn or Cu. Total and insoluble nitrogen content in corn grains were increased by all treatments and the highest values of soluble nitrogen were recorded by a mixture of 100 ppm Zn + Cu. Carbohydrate fractions slightly increased by any levels of Zn or Cu treatments, and the highest value recorded by the second level from Zn + Cu. The oil content of corn grains was reduced by the adding all treatments especially in case Zn treatments. The application of 50 or 100 ppm Cu improved the total free amino acids content in corn grains while Zn treatments was decreased amino acids content. Phosphorus content in corn grains was increased by Zn treatments, while Cu treatments caused decreased phosphorus content. Also, Potassium content in corn grains was increased by the applications of Zn treatments and gave slightly decrease by Cu treatments.
In conclusion, the result of the present work suggested that the foliar application of any treatment from Zn on the corn grain, were increase increased yield, nitrogen fraction, and carbohydrate fraction, P content but reduced oils content, and potassium content of corn grains, while, the application treatment from Cu increased the yield, nitrogen faction , carbohydrate content at low concentration and total free amino acid content, but improve oil content compared with foliar from Zn and reduce P, K contents. Also, treatment application from mixed Zn and Cu on corn grain increased total N content, yield but reduce P,K and total free amino.