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Abstract
Field experiments was carried out at the experimental Farm, Faculty of agriculture, Minufiya university in 2008 season and repeated in 2009 season to investigate the effect of nitrogen fertilization levels on dry matter and nitrogen accumulation and productivity of some white maize varieties differed in their prolificacy (number of ears). Every experiment included 25 treatments which were the combination of five nitrogen levels and five maize varieties. The tested treatments were arrangedin a split plot design plot design with three replicates, where the nitrogen levels was allocated in the main plots and the varieties occupied the sub-plots. The grains were sown on May 12 and 14 for 2008 and 2009 seasons, respectively.
It can be suggested that growing single cross 30 K 8 and / or three way cross Nefertili varieties and fertilizing them with 90 and/ or 120 kg N/ fed are the best treatments for improving the productivity of maize under Minufiya Governorate conditions through increasing dry matter accumulation and nitrogen translocation as well as number of ears / plant and grain yield / fed.