Pedosphere 28(6): 873--883, 2018
ISSN 1002-0160/CN 32-1315/P
©2018 Soil Science Society of China
Published by Elsevier B.V. and Science Press
Aging effects of organic and inorganic fertilizers on phosphorus fractionation in a calcareous sandy loam soil
Munir AHMAD1, Mahtab AHMAD1, Ahmed H. EL-NAGGAR1,2, Adel R. A. USMAN1,3, Adel ABDULJABBAR4, Meththika VITHANAGE5, Jamal ELFAKI1, Abdulelah AL-FARAJ6, Mohammad I. AL-WABEL1
1Soil Sciences Department, College of Food and Agricultural Sciences, King Saud University, Riyadh 11451(Saudi Arabia);
2Department of Soil Science, Faculty of Agriculture, Ain Shams University, Cairo 11241(Egypt);
3Department of Soils and Water, Faculty of Agriculture, Assiut University, Assiut 71526(Egypt);
4Industrial Psychology, College of Education, King Saud University, Riyadh 11451(Saudi Arabia);
5Chemical and Environmental Systems Modeling Research Group, Institute of Fundamental Studies, Kandy 20000(Sri Lanka);
6Agriculture Engineering Department, College of Food and Agriculture Sciences, King Saud University, Riyadh 11451(Saudi Arabia)
ABSTRACT
      In most arid and semiarid soils, naturally occurring phosphorus (P) is a major yield-limiting plant nutrient. In this study, to investigate the effects of organic (OP) and inorganic P (IP) sources on P fractionation, a calcareous sandy loam alkaline soil was fertilized with OP and IP fertilizers at low (80 mg P kg-1 soil) and high (160 mg P kg-1 soil) application rates. Three combinations of OP and IP (i.e., 75% OP + 25% IP, 50% OP + 50% IP, and 25% OP + 75% IP) were applied at low and high application rates, respectively, followed by soil aging for 21 d. Soil samples were collected after 1, 2, 3, 7, and 21 d and subjected to sequential extraction to analyze soluble and exchangeable, Fe- and Al-bound, Ca-bound, and residual P fractions. The soluble and exchangeable P fraction significantly increased up to 24.3%, whereas the Ca-bound fraction decreased up to 40.7% in the soils receiving 75% OP + 25% IP and 50% OP + 50% IP, respectively, compared with the control (receiving no P fertilizer). However, the transformation of P fractions was influenced by aging time. Addition of P sources caused instant changes in different P fractions, which then tended to decline with aging time. Change in soil pH was the limiting factor in controlling P availability. At high application rate, the OP source significantly increased soil P availability compared with the IP source with soil aging. Depending on P fractionation, a proper combination of OP and IP fertilizers, as long-term slow and instant P-releasing sources for plant uptake, respectively, may be a sustainable strategy to meet crop P requirements in the arid and semiarid soils.
Key Words:  phosphorus availability,phosphorus fraction,poultry manure,sequential extraction,soil pH
Citation: Ahmad M, Ahmad M, El-Naggar A H, Usman A R A, Abduljabbar A, Vithanage M, Elfaki J, Al-Faraj A, Al-Wabel M I. 2018. Aging effects of organic and inorganic fertilizers on phosphorus fractionation in a calcareous sandy loam soil. Pedosphere. 28(6):873-883.
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