الفهرس 
IntroductionOnly 14 pages are availabe for public view
 |  | from | 239 |  |  |
| | | from | 239 | | |
Abstract
This study was conducted on potato crop cv. Spunta during the two
seasons of 2001 and 2003 to investigate the effect of soil dressing with
Ammonium nitrate, Ammonium sulfate and Ureaformaldhyde as N-fertilizers at
the three N-levels 50, 100 and 150 kgN/fed. either alone or in combination with
biofertilizer (Azospirillum + Azotobacter) in addition to their interactions on
plant vegetative growth, yield and yield components as well as tuber quality,
chemical composition and storability of tubers.
The experiment included 18 treatments as following, three N-fertilizers of
chemical N-fertilizers (Ammonium nitrate, Ammonium sulfate and
Ureaformaldhyde) were applied at 50, 100 and 150 kg N/fed. Each level of
ammonium nitrate and ammonium sulfate were divided and applied at two equal
doses with the first and second irrigation, while Ureaformaldhyde was added as
one dose before the first irrigation.
The experimental design was split-split plot system with 3 replicates. The
three N-fertilizers occupied the main plots which were subdivided to three sub
plots each contained one of the nitrogen levels while, the biofertilization
treatments were assigned to sub-sub plots.