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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/10112

Title: Phosphorus Forms in a Sandy Soil (Torripsamment) under Palm Orchards of Different Age in Saudi Arabia.
Authors: M. S. Heakal
M. H. Al-Awajy
M. S. Al-Sewailem
A. Al-Sheikh
F. N. Barakah
Issue Date: 1995
Abstract: Flood irrigated date-palm orchards annually manured for 10 (=Ul0), 50 (=U50), 110 (= U110) and 230 = (U230) years together with a barren site in a nearby desert (=U0), all on sandy soils, were analysed for total P (TP), organic P (OP), inorganic P extracted by 0.5 m H2SO4 (Ca-P), inorganic P not extracted by 0.5 m H2SO4 (NP), total N (TN) and organic C (TC). Watering resulted in continuing CaCO3 accumulation in the soils. TC and TN to 160 cm depth increased rapidly over the first 50 years (120 g C m-2 a-1 and 9.7 g N m-2 a-1 ), then the increases slowed. In contrast, TP continued to accumulate steadily (4.8 g P m-2 a-1). At U0, TP to 160 cm depth was very small (= 88 mg kg-1 ) and dominated by Ca-P with OP as a minor component. At U10, OP and Ca-P were in equal proportions. The latter acquired increasing dominance with increasing period of treatment whereas OP reached a steady state. NP increased at a rate which decreased with time. It is likely that most of OP compounds have been leached down the profile where mineralization and subsequent immobilization. probably by Ca2+ ions from irrigation waters, have occurred.
URI: http://hdl.handle.net/123456789/10112
Appears in Collections:College of Foods And Agricultural Science

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