The study was carried out at the Agricultural Research and Experimental Center of the Faculty of Agriculture, Moshtohor, to determine the effect of foliar application of zinc sulphate (zero, 0.4%) and four nitrogen fertilizer levels(60, 90, 120 and 150 kg/fed) on growth, yield and yield components for three maize hybrids (T.W.C.310, S.C.122 and S.C.155 Yellow). The important results which were obtained from this study were as follows:
The varietal differences were significant in all agronomic growth characters, ear characters, yield and yield components in combined analysis except ear diameter, number of kernels/row and 100-kernel weight.S.C.122 gave the highest values of ear height, leaf area topmost ear, number of ears/plant, ear length, weight of kernels/ear, grain yield/plant and grain yield/fed as compared with T.W.C.310 and S.C. 155Y.
Zinc application as spray resulted in significant increases in plant height, ear height, leaf area topmost ear, number of ears/plant, ear length, weight of kernels/ear, grain yield per plant and fed in the combined analysis.
Applying of 120 or 150 kg N/fed caused increased significantly all growth characters, ear characters, yield and yield components in the combined analysis except number of rows/ear and shelling percentage more than 60 or 90 kg N/fed.
The interaction between maize hybrids and spraying of zinc significantly affected ear height, ear length and grain yield/fed. Interaction between maize hybrids and nitrogen fertilizer levels significantly affected plant height, ear height, stem diameter, weight of kernels/ear and grain yield/fed. Interaction between spraying of zinc and nitrogen fertilizer levels significantly affected ear height and grain yield/fed in the combined analysis.
It could be concluded that under the conditions of the experiment, S.C.122 supplied with120or150 kg N/fed and spraying of zinc gave the highest grain yield/fed.
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