EFFECT OF SULPHUR , PHOSPHORUS AND GIBBERELLIC ACID ON SOME MINERAL CONCENTRATION IN LEAVES OF DIXIRED PEACH TRANSPLANTS

Dixired peach transplants which were budded on peach seedling rootstock and planted on black polyethylene bags containing 9 Kg soil were fertilized with three levels of sulphur ( 0 , 250 and 500 mg. S Kg-1soil ) and phosphorus ( 0 , 15 and 30 mg P Kg-1 soil ) .The agriculture sulphur ( 95 % S ) and triple super phosphate ( 22 % P ) used as a source for sulphur and phosphorus respectively , which were mixed with soil when the transplants planted in the bags at the 17th of febroury at both seasons . Transplants were sprayed with three levels of GA3 ( 0 , 15 and 30 mg. GA3 L-1 ) twice at both seasons , first spray was after 45 days from full buds burst , while the second was after one month from the first spray . Results indicated that application of sulphur , phosphorus and GA3 each alone and all interactions among them significantly increased N , P , K and S concentrations in the leaves in both seasons , except the effect of GA3 on N concentration in the leaves at both seasons , and the effect of phosphorus on leaves K concentration at the second season only . The treatment 500 mg. S Kg-1 soil + 30 mg. P Kg-1 soil + 30 mg. GA3 L-1. was the best , which gave the highest means of P , K and S at both seasons , the concentration of N , P , K and S on it was respectively 2.38 , 0.19 , 2.31 and 0.27 % in the first season and 2.57 , 0.23 , 3.38 and 0.35 % in the second season .