الفهرس 
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Abstract
Two field experiments were carried out during the two successive seasons of 199611997 and 199711998 at the Agricultural Experimintal Station of Benha, Kalubia grovernate, using cultivar onion Giza 20.
The aim of this investigation was to study the effect of some fertilizer treatments (N, P and K) and harvesting dates (preventing irrigation before harvest) on growth characters, i.e., vegetative growth, bulb characters, yield and its components, storageability and quality of onions. Relative contribution for growth characters to yield, i.e., stepwise multiple linear regression analysis and factor analysis were carried out. Experimental efficiency parameters was also investigated, i.e., soil heterogeneity index, plot size and number of replications.
These experiments included eight fertilization treatments, which were the combination of two nitrogen levels (0.0 and 90 unit N I fed.), two phosphorus levels (0.0 and 60 unit I fed.) and two potassium levels (0.0 and 100 unit I fed.). Two harvesting dates were also studied. The first harvest date was after 25 days from the last irrigation and the second harvest date was after 40 days from the last irrigation. The experimental design was split plot design with four replicates. The harvesting dates were assigned in the main plots and fertilizer treatments were allocated in the sub plots. The experimental plot consisted of four rows each of four meters in long and 50 em width. The area
of each plot was 8 m2 Transplanting distances were 10 em
apart on both sides of each row.