A field trial was conducted during the two successive seasons of 2007 and 2008 in the Experimental Farm at Demo (a newly reclaimed soil), Faculty of Agriculture, Fayoum University to investigate the influence of phosphate fertilizer at the rates of 0,100, 200 and 300 kg/fed as (calcium superphosphate, 15.5 % P 2 O 5 ) before planting during soil preparation, and /or some micronutrients combined fertilizer of Pholaz D, ( 2.8 % Fe ,2.8% Zn and 9.2 % Mn ) as foliar spray with three concentration 0, 0.1 and 0.3 % ,alone or in combination with each other on improving growth, seed or oil yields, and some chemical constituents of sunflower plants (Helianthus annuus L.) under a newly reclaimed soil. The obtained data showed significant positive influences of all phosphate and micronutrients treatment used in this study were observed on growth, yields of seeds or their oil contents and some chemical constituents in both tested seasons. In comparison with the control, treated plants with phosphate and micronutrients at all studied rates significantly increased vegetative growth traits (i.e., plant height, number of leaves/plant, total leaf area/plant and dry weight of leaves/plant), seed yield /fed and its components (i.e. head diameter, head dry weight, seeds weight /plant, 100 seed weight ), in addition to some nutrients( i.e., N, P, K, Fe, Mn, Zn) and chemical constituents (i.e., total carbohydrates, crude protein and seed oils). The maximum increases in the studied plant parameters were resulted from using phosphate fertilizer at the rate of 300 kg/fed and combined fertilizer of micronutrients at the rate of 0.3% alone or together.In view of these results, it could be concluded that treated sunflower plants with phosphate at the rate of 300 kg/fed and the used combined fertilizer of micronutrients at the rate of 0.3% alone or together producing on economic yield for each of seed and its oil content.
