Abstract
The present study was conducted in Ninevah forest to study some effects of pollarding on Robinia pseudoacacia seedling at one year age . The pollarding method was done each two monthls at the fixed different heights above ground level namely , 10 , 20 and 30cm to stimulate the growth of the plant to maximize biomass production . The results indicated that the highest average of monthly growth in length ( 5.27 cm ) was obtained when the pollarding was done at level above ground height , while the highest average in diameter ( 0.25 ) occurred in plant pollarded 10 cm above the ground level . With respect to the number of pollarding , it appeared that that with out pollarding was the best when compared with other numbers of pollarding , since it gave the highest average of monthly in length ( 3.55 cm ) and diameter ( 0.30 mm ) .As for pollarding dates, 1st of October, was the best in a achieving , the highest increase in the average monthly growth in height ( 16.54 cm ) and in diameter ( 1.62 mm ) among the other pollarding dates .The highest overage of dry Biomass of shoots from each pollard and the total pollards was reached when pollarding was done at the ground level . these overages were ( 7.70 gm and 19.29 gm ) . No pollarding among the number of pollards of Robinia seedling at one year old was the best in its effect on giving the highest overages of dry Biomass of the shoots from each pollard and from total pollards ( 60.15 and 50.94 g ) in regard to the date of pollarding Ist November was the best in giving the highest mean (18.88 g) in dry weight of shoots.
