SPLIT APPLICATION NITROGEN FOR ( Zea Mays L.)GENOTYPES TO GET THE BEST SINK

	SPLIT APPLICATION NITROGEN FOR ( Zea Mays L.)GENOTYPES TO GET THE BEST SINK
Journal of Tikrit University For Agriculture Sciences
Article 1, Volume 9, Issue 1, 2009, Pages 104-116
Abstract
A field experiment was carried out at the research farm college of Agric University of Baghdad ، during the spring and autumn seasons of 2002. The objective was to determine the effects of split application nitrogen and four corn genotypes. A split plot arrangement in R. C. B. D. With three replications was used Genotypes (Bohoth 106 ، IPA 3001 and IPA 3003) were assigned in the main plots , while four application timing of nitrogen 320 kg N/ha )three parts) in plating ، after one month and after two months (nine parts) one part every week ، (five parts) one of them every two weeks and (four parts) one of them every three weeks were assigned in sub plots. Significant effect in weight grain and in yield efficiency in spring season when nine parts of N application gave increase percentage %19 from the control treatment and four parts of N application gave height yield in plant in autumn (92.20)gm with increase percentage %6 of control treatment , that because gave height grain number pear ear , for that we suggest applied N fertilizer every three weeks

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