Two field experiments were conducted at the farm of the Experimental Research Center of the Faculty of Agriculture Moshtohor, during 2003 and 2004 seasons to assay the effect of three irrigation intervals i.e. every 10, 15 and 20 days, four nitrogen (N) rates i.e. control, 50, 100 and 150 kg N/fed and two spraying treatments with zinc (Zn) i.e. tap water (control) and 0.05 % Zn EDTA, 14% Zn (70 mg Zn/L) as well as their interactions on yield, uptake and Agronomic efficiency of N in maize
The obtained results could be summarized as follows:-
Irrigation every 20 day recorded the lowest values markedly of plant and ear height, ear length and diameter, No. of rows/ear, No. of grains/row, ear weight, grain yield/ear, shelling %, 100 grains weight, grain yield/fed, grain protein content (GPC), N uptake, Agronomic N efficiency (AEN) and apparent N recovery (ARN).
The greatest value of the all studied characters in both seasons obtained by 150 kg N/fed, main while, AEN and ARN decreased with the increasing N application rates in both seasons. However, the difference between 100 and 150 kg N/fed on ear weight, grain yield/ear, shelling %, grain yield/fed and grain protein content were not significant.
Zinc application as foliar spray led to significant increase in the pervious characteristics of yield , yield components, GPC, N uptake and ARN. While, Zn showed insignificant effect on AEN in both seasons.
Key words: Mazie, irrigation, N rates, Zn , N uptake, N efficiency and N recovery