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 % P2O5 )
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.