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)
      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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