Two field experiments were carried out in the Research and Experimental Center of Faculty of Agriculture at Moshtohor, Benha University, Egypt, during 2004/2005 and 2005/2006 seasons. The aim of this study was to determine the effect of N (zero, 25 kg N/fed) and P (zero, 15.5 P2O5, 31.0 P2O5 kg/fed) fertilizers on two new genotypes of faba bean (Shebeen El-Koom 7 and 9) as well as the commercial variety (Giza 461). The characters studied were plant height (cm), number of branches and pods/plant, weight of pods/plant (g), number of seeds/pod weight of seeds/plant (g), weight of 100-seed (g) and seed yield (kg/fed).
The differences between faba bean genotypes were significant for all the studied traits in the separate seasons as well as the combined analysis, except number of pods / plant in the combined analysis, and weight of seeds/plant in the first season. Shebeen 7 had the highest seed yield / fed over the two seasons and out-yielded shebeen 9 and Giza 461 by 12.4% and 5.4%, respectively.
Nitrogen fertilizer level 25 kg N/fed was significant for all the studied traits in the two growing seasons and the combined analysis. Seed yield was increased by adding 25 kg N/fed over the unfertilized by 11.4% in the combined analysis. However increasing phosphorus levels from 0 to 15.5 kg P2O5/fed induced favorable effect on all studied characters. Further increase in phosphorus level up to 31 kg P2O5/fed showed better effect in all characters, but differences were not great enough to reach the 5% level of significance in the most traits.
Data of the second order interaction revealed that Shebeen 7 at the level 25 kg N/fed and 15.5 kg P2O5/fed. level recorded the maximum value of seed yield / fed.
The simple correlation study indicated that there were positive and high significant correlation coefficients between seed yield/fed and each of other traits except plant height in the combined analysis.
Generally, it can be concluded that planting Shebeen7 genotypes and fertilizing with 25 kg N/fed and 15.5 kg P2O5/fed may be the recommended treatment to improve the productivity of faba bean crop under the conditions of the present study.
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