Two field trials were carried out at Ismaelia Agricultural Research Station in
summer of 2002 and 2003 seasons to estimate the relative contributions of yield
components for intercropping sesame (Giza 32) on groundnut (Giza5) varieties using
simple correlation, multiple regression and stepwise regression analysis procedures.
Results of simple correlation analysis for sesame cleared that significant positive
correlation was found between seed yield kg/fed. (y1) and each of oil quantity ,No.of
capsules, seed yield / plant and stand plant with r- values being 0.940 ,0.695 ,0.682
and 0.660, respectively. There were highly significant positive correlations between
quantity of oil (y2) and each of No.of capsules ,seed yield /plant and percentage of
stand plant with r- values of 0.665, 0.608 and 0.578, respectively . The multiple
regression analysis cleared that the relative contributions for all characters were
92.8% and 76.5% in the total variation for seed yield and quantity of oil ,respectively.
Stepwise regression analysis selected four variables out of ten contributing by
92.8% in the variance of seed yield . These factors were quantity of oil/seed (x7),
stand plant ratio (x10), seed yield/plant (x8) and plant height (x6) with R2 of 88.4 ,2 ,
1.2 and 1 %, respectively, in total variation of seed yield. Stepwise also selected six
out of nine variables contributing by 75.3% from the variance of quantity of oil and
these variables were No, of capsules/plant (x4) , plant height (x6) , stand of plant (x9),
No. of leaves/plant (x5), weight of 1000 seeds (x8) and seed yield/plant (x7) with R 2
being 44.3,15.9,6.4,4.4,2.6 and 1.7%, respectively. For groundnut , results of simple correlation analysis cleared significant
positive correlation between yield kg/fed and each of oil quantity, weight of pod / plant
and weight of 100 seeds, with r- values of 0.803, 0.760 and 0.633, respectively.
Multiple regression analysis indicated that the relative contributions for all characters
were 80.2% from the total variation for yield kg/fed. Results of stepwise regression
analysis revealed that three out of eleven variables contributed by 74.8% in the total
variation for yield kg/fed .. These variables were quantity of oil/seed (x7), weight of
100seeds (x9) and weight of pod/plant (x10) with R2 being 64.6, 6.8 and 3.4%
respectively.