The Iraqi Journal of Agricultural Sciences

9

Authors: Mustafa J. Al-Khafajy Medhat M. Elsahookie

A field experiment was conducted at the field of the Dept. of Field Crop Sci. / College of Agriculture / University of Baghdad . The objective was to determine the values of relative constant of three – way and double crosses of maize . Ten inbreds were used and crossed during spring and fall seasons of 2009 to produce three - way and double crosses , and ten hybrids were taken from each group . The ten hybrids were grown and selfed during spring 2010 to produce 2 seed . Three way and double crosses were sown with their parents and 2 seed during fall 2010 in RCBD with four replicates . Leaf area , total dry matter , row/ear , grain/ear , grain weight and grain weight/plant of hybrids , parents and 2 plants were taken . Results showed that the relative constant obtained was applicable to estimate ̅2 of hybrids . However , leaf area was different in values of ̅2 , as compared to that observed in the field . The relative constant values were different as trait and parent number of crosses differ . The obtained relative constant of grain weight/plant was (0.576) and (0.556) , grain weight (0.521) and (0.516) , grain /ear (0.571) and (0.554) , raw / ear (0.509) and (0.502) , total dry matter . plant -1 (0.553) and (0.541) and leaf area (0.508) and (0.495) in three way and double crosses , respectively . It was concluded that the application of relative constant , to predict parent means ( ̅), ̅2 and parent number (n) was fit as compared to Wright's equation [ ̅2= ̅1 – ( ̅1 - ̅)/n ] . Accordingly , it was recommended to use the formula [ ̅2 = χ ( ̅1 + ̅)] to predict ̅2 of hybrids , [ ̅= ( ̅2 / χ ) – ̅1] to predict ̅, and [ n = ( ̅1 - ̅ ) / ( ̅1 - ̅2 ) ] to predict number of inbreds included in the hybrid

11

Authors: Yasir J.Alisawi Hameed K.Khrbeet

A field experiment was conducted at the research farm of Dept of Field Crop Sciences-University of Baghdad during two successive winter season 2007-2008 and 2008-2009 to study the effect of foliar application with zinc on yield and its components of six cultivars of faba bean (Vicia faba L.). The layout of the experiment was asplit-plot design with three replicates. The six cultivars (S.A, S.B, S.C, ILB1814, ILB1266 and local cultivar) occupied the main plots, while zinc concentrations (0, 20, 40, 60) mg.l-1 occupied the sub-plots. Results showed that the concentration 60 mg.l-1 was superior in the percentage of fertility 5.30, 5.49 % in both seasons, respectively, also concentration 40 mg.l-1 was superior in the number of pods per plant, 33.50 and 34.96 in both seasons, respectively, The concentration 40 mg.l-1 was superior in number of seeds per pod (3.394, 3.439) in both seasons, respectively. Also the same concentration gave the highest seed weight (929, 956.6) mg in both seasons, respectively. The highest seed yields, 2315and 2515 kg.ha-1 were obtained from foliar applications by zinc concentration 20 mg.l-1 in both seasons, respectively. The results showed that local cultivar was the best in yield and its components.Therefore, it was recommended to grow the local cultivar with the application of zinc concentration 20 mg.l-1 .

18

Authors: Waleed A.A.Al-Rawi Ihsan M.Helmi Najim A.Jasim Farooq F. Jomaa

This experiment was conducted at apricot orchard ,Dep . of Horticulture , College of Agriculture , University of Baghdad ,Abu Ghraib during the growing seasons of 2009 and 2010 . Apricot trees Prunus armeniaca L. cv.Zaini five year old were used . This study included two factors ; growth regulator(e) and winter pruning (t) wich done in the beginning of february . The first factor four levels were used, 0,0 (e1) , 600 (e2) , 900 (e3) and1200 (e4) mg / l and four levels of pruning , 0,0 (t1) , 10 (t2) , 20 (t3) and 30 (t4) % of the branches. Each treatment replicated three times with a factorial experiment using RCBD. The number of trees used were 48 trees . The experimental results showed that growth regulator (Enfaton) 600 mg /l and thinning 30% of branches (e2t4) significantly gave the highest leaf area of 24.06 and 24.61 cm2 and the highest average yearly growth of 31.51 and 35.63 cm and the highest chlorophyll index of 30.68 and 31.94 SPAD unit and the highest average fruit weight of 12.93 and 13.18 gm and yield per tree of 11.52 and 13.26 kg for both seasons, respectively. The lowest value of these parameters were found in the control (e1t1) treatment, it was highest in branches content of carbohydrates of 10.65% and 9.52% in both seasons , respectively . The experimental results showed that the highest in branches content of carbohydrates was in January of 14.71 and12.79% and the lowest of these average was in June of 5.16 and4.95 % in both seasons , respectively . It could be concluded from this experiment that the growth regulator at level e2 and winter pruning treatments at the level t4 improved vegetative and fruits characteristics in apricot trees cv . Zaini and we recommended conducting these treatments annually and study the effect of growth regulator and winter pruning in the other dates on the apricot cvs.