الفهرس 
ACKNOWLEDGMENT
Effect of varietiesOnly 14 pages are availabe for public view
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Abstract
Two field experiments were carried out at El-Ghorieb Exp. Farm, Agriculture Fac., Assiut Univ., Egypt, during the summer of 2009 and 2010 seasons to investigate the effect of three nitrogen fertilizer rates (15, 25 and 35 kg N/fed.) and three phosphorus fertilizer rates (15.5, 23.0 and 31.0 kg P2O5/fed. on the yield and its attributes for three peanut varieties (Giza 9 as spreading group, Giza 5 and Giza 6 as erect group), grown in sandy calcareous soil.
The experimental design was split-split plot in a randomized complete block design at split-split plot with four replicates. The varieties arranged in the main plots, phosphorus treatments allocated in the sub-plots and nitrogen treatments occupied the sub-sub plots.
The important results could be summarized as follow:
I- Growth, yield attributes and yield traits:
1. Plant height (cm):
- Giza 9 variety was taller plants than Giza 5 and Giza 6 varieties in both seasons.
- The tallest plants were recorded by the highest phosphorus rate (31.0 kg P2O5/fed. in the 1st season.
- The plant height increased by increasing nitrogen fertilizer rates in both seasons.
- The tallest plants were obtained by V2xP3, V1xN3, P3xN3 and V2xP3xN2 followed by V1xP3xN3 in the 1st season, while the tallest plant height were recorded by V1xP1 in the 2nd season.
2. Number of branches/plant:
- The highest values of number of branches/plant were recorded by Giza 5 variety in the 1st season and it recorded by the highest rates of phosphorus and nitrogen fertilizer rates in both seasons.
- The highest values of number of branches/plant were recorded by V2xP3, V2xN3, P3xN3 and V1xP3xN2 interactions in the 1st season, while the highest ones in the 2nd season were recorded by V1xP1, P1xN1 or P3xN3 and V3xP3xN3 interactions.
3. Number of pods per plant:
- The highest values of number of pods/plant were obtained by Giza 6 variety and by the highest phosphorus and nitrogen fertilizer rates in both seasons.
- The highest number of pods/plant were obtained by V3xP3, V3xN3 and P3xN3 interactions in both seasons, as well as the highest ones were obtained by V3xP3xN2 and by V3xP3xN3 in the 1st and the 2nd seasons, respectively.
4. Pods weight per plant (g):
- The maximum values of pods weight per plant were scored by Giza 6 variety in both seasons. As well as the maximum ones were scored by 23.0 and 15.5 kg P2O5/fed., then scored by 35 and 25 kg N/fed. in the 1st and the 2nd seasons, respectively.
- The maximum values of pods weight/plant were scored by V3xP3, V3xN3, P2xN2 and V3xP3xN3 interactions in the 1st season, while in the 2nd season the maximum ones were scored by V3xP2, V3xN3, P1xN3 and V3xP2xN2 followed by V3xP1xN3 interactions.
5. 100-pods weight (g):
- The maximum values of 100-pods weight were obtained by Giza 6 and Giza 9 varieties in the 1st and the 2nd seasons, respectively. As well as the maximum ones were obtained by 23.0 and 15.5 kg P2O5/fed. and obtained by 15 and 25 kg N/fed. in the 1st and the 2nd seasons, respectively.
- The maximum values of 100-pods weight was obtained by P3xN1 interaction in the 1st season, while in the 2nd season the maximum ones were obtained by V1xP3, P1xN2 and V2xP1xN2 interactions.
6. Number of seeds per pod:
- Giza 9 variety gave the highest number of seeds/pod in both seasons. As well as, the 23.0 or 31.0 kg P2O5/fed. and 15 kg N/fed. gave the maximum number of seeds/pod in both seasons.
- The maximum values for number of seeds/pod were recorded by V1xN1 interaction in both seasons, while the maximum ones were recorded by V1xN1 and P3xN1 interactions in the 1st season.
7. Seeds weight per plant (g):
- Giza 6 and Giza 5 varieties gave the maximum values of seeds weight/ plant in the 1st and the 2nd seasons, respectively.
- The highest phosphorus fertilizer rates in both seasons, as well as the 25 or/and the 35 kg N/fed. in the 1st and the 2nd seasons, respectively, gave the maximum values of seeds weight/plant.
- The maximum values of seeds weight/plant are produced by V3xP3, V3xN3, P3xN2 and V3xP3xN2 followed by V3xP3xN1 interactions in the 1st season, while in the 2nd season the maximum ones were produced by V3xP1, V3xN3, P1xN3 and V3xP1xN3 followed by V2xP1xN3 interaction.
8. 100-seeds weight (g):
- Giza 6 and Giza 9 varieties gave the heaviest 100-seeds weight in the 1st and the 2nd seasons, respectively.
- The 15.5 and 31.0 kg P2O5/fed., as well as the 35 and 25 kg N/fed. gave the heaviest 100-seeds weight in the 1st and the 2nd seasons, respectively.
- The heaviest values of 100-seeds weight were obtained by P1xN2 and V3xP2xN2 followed by V1xP3xN2 interactions in the 1st season, while in the 2nd season the heaviest ones were obtained by V1xP3, V1xN2, P1xN2 and V1xP2xN1 followed by V2xP3xN1 interactions.
9. Pods yield (ton/fed.):
- Giza 9 and Giza 6 varieties showed the maximum values of pods yield/fed. in the 1st and the 2nd seasons, respectively.
- The highest phosphorus fertilizer rates in both seasons as well as the nitrogen fertilizer at 25 and 15 kg N/fed. in the 1st and the 2nd seasons, respectively, showed the maximum pods yield/fed.
- The maximum values of pods yield/fed. were produced by V1xP1 followed by V1xP2; V1xN3 followed by V1xN1; P2xN3 followed by P3xN3 and V1xP2xN3 followed by V1xP1xN2 interactions in the 1st seasons, while the maximum ones in the 2nd season were produced by V3xP3, V3xN3; P3xN2 or P1xN3 and V1xP3xN2 followed by V3xP3xN1 interactions.
10. Fodder yield (ton/fed.):
- Giza 9 variety as well as the highest fertilizer rates of phosphorus and nitrogen gave the maximum values of fodder yield/fed. in both seasons.
- The maximum fodder yield/fed. were obtained by V3xP1, V2xN2, P2xN3 followed by P1xN3 and N1xP3xN2 interactions in the 1st season, while the maximum ones in the 2nd season were obtained by V2xP3 followed by V3xP3; V3xN3, P3xN3 and V2xP3xN3 followed by V3xP3xN2 interactions.
11. Biological yield (ton/fed.):
- Giza 6 variety as well as the highest fertilizer rates of phosphorus and nitrogen showed the maximum values of biological yield/fed. in both seasons.
- The maximum values of biological yield/fed. were produced by V1xP3, V3xN3, P3xN3 and V1xP3xN2 followed by V3xP3xN3 interactions in the 1st season, while the maximum ones in the 2nd season were produced by V3xN3, P3xN3 and V2xP3xN3 followed by V2xP3xN3 interactions.
II. Quality traits:
1. Protein percentage (%):
- Giza 5 variety as well as the phosphorus and nitrogen fertilizer at 15.5 kg P2O5/fed. and 25 kg N/fed. gave the highest values of protein % in the 1st season.
- The highest values of protein % were obtained by V2xP3 or V3xP1; V2xN2 followed by V2xN3; P1xN3 followed by P1xN2 interactions in the 1st season.
2. Oil percentage (%):
- Giza 5 variety as well as the highest phosphorus fertilizer rate; 31.0 kg P2O5/fed. and nitrogen fertilizer at 25 followed by 15 kg N/fed. gave the highest values of seed oil % in the 1st season.
- The highest values of seed oil % were obtained by V2xP2 followed by V3xP3; V2xN2 followed by V2xN3 and P2xN1 followed by P3xN1 interactions in the 1st season.