Effect of irrigation intervals, nitrogen rates and spraying with zinc on yield and argonomic efficiency of nitrogen in maize
2005
El-Gizawi, Nasser K.
Two field experiments were conducted at the Experimental Research Center of the Faculty of Agriculture at Moshtohor. during 2003 and 2004 seasons to asses 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 of plant and ear height, ear length and diameter, No. of rows/ear, No. of grains/row, ear weight, ;, grain yield/ear, shelling %, 100-grain weight. grain yield/fed, grain protein content (GPC), N uptake, agronomic N efficiency (AEN) and apparent N recovery (ARN). The greatest values of all studied characters in both seasons were obtained by 150 kg N/fed, meanwhile. A EN and ARN decreased with increasing N application rates in both seasons. However, the difference between 100 and 150 kg N/fed on ear weight, grain yieldlear. shelling %. grain yield/fed and grain protein content were not significant Zinc application as foliar spray led to significant increase in the previous characteristics of yield , yield components, GPC. N uptake and ARN. While, Zn showed insignificant effect on AEN in both seasons.
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