الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
Laboratory and two biological experiments were conducted in sandy and calcareous soils to study the effect of different soil amendments i.e.; Chicken Manure (Ch.M) and Orange residues (OR) at a rate of 20 Mg fed.-1, Perlite (Per) and Vermiculite (Ver) at a rate of 2 Mg fed.-1 and sulphur (S) at a rate of 500 kg fed.-1 and their combinations on the efficiency of phosphatic fertilizers such as ordinary super phosphate (OSP) and rock phosphate (RP) at a rate of 100 kg P2O5 fed.-1 in incubation experiment and at a rate of 30 Kg P2O5 fed.-1 in the biological experiments An incubation experiment was conducted under laboratory condition to study the effect of some phosphatic fertilizers i.e.; ordinary super phosphate (OSP) and rock phosphate (RP), either singly or combined with different soil amendments on available, inorganic and organic phosphorus content through different incubation periods i.e.; 7, 15 , 30 , 60 , 90 , 120 and 150 days in the tested soils. The results showed that the treatment of (OSP or RP +2% Ch.M) without or with mineral soil amendments gave the highest value of total phosphorus, while the treatment of OSP or RP in absence of organic and mineral soil amendments gave the lowest one in the two studied soils. In absence of organic and mineral soil amendments, the available and mineral phosphorus was greater with OSP treatment than with RP in the tested soils. However, The average value of organic phosphorus in sandy soil was lower with RP than with OSP, while this average value was greater with RP treatment than with OSP one in calcareous soil.The treatment of (OSP + 2% Ch.M +Ver) in a sandy soil and the treatment of (OSP+2% Ch.M +S) in a calcareous soil showed beneficial effects on the available phosphorus if compared to the other treatments. The application of perlite material combined with (RP +2% OR) in a sandy soil and vermiculite material mixed with (OSP +0.5%Ch.M+1.5%OR) in a calcareous one gave the lowest average value of soil mineral phosphorus if compared to the other treatments. The treatment of (RP+2% OR+Ver) in a sandy soil and (OSP +2% OR+Ver) in a calcareous one gave the least average values of organic phosphorus if compared to the other treatments.Two pots experiments were carried out to study the effect of different phosphatic fertilizers i.e.; ordinary super phosphate and rock phosphate mixed either with organic amendments (chicken manure and orange residues) or mineral amendments (perlite and vermiculite) with and without elemental sulphur on dry matter yield, yield quality and NPK- uptake by barley and faba bean plants in sandy and calcareous soils. The results showed that the application of (OSP+Ch.M+S) gave the highest values of the total dry weight, N, P and K- uptake by barley plants in the most stages in the two studied soils. The application of (OSP+Ch.M +S) gave the highest values of the total dry weight, N, P and K- uptake by faba bean plants in all stages in the two studied soils, except flowering stage in sandy soil. The application of (OSP+Ch.M+S) gave the highest values of the biological yield, protein content, 1000 grains weight of barley and 100 seeds weight of faba bean in the two studied soils, while the application of (RP+Ver) gave the lowest ones.