TY - JOUR
T1 - Aging Effects of Organic and Inorganic Fertilizers on Phosphorus Fractionation in a Calcareous Sandy Loam Soil
AU - AHMAD, Munir
AU - AHMAD, Mahtab
AU - EL-NAGGAR, Ahmed H.
AU - USMAN, Adel R.A.
AU - ABDULJABBAR, Adel
AU - VITHANAGE, Meththika
AU - ELFAKI, Jamal
AU - AL-FARAJ, Abdulelah
AU - AL-WABEL, Mohammad I.
N1 - Publisher Copyright:
© 2018 Soil Science Society of China
PY - 2018/12
Y1 - 2018/12
N2 - 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.
AB - 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.
KW - phosphorus availability
KW - phosphorus fraction
KW - poultry manure
KW - sequential extraction
KW - soil pH
UR - http://www.scopus.com/inward/record.url?scp=85036614676&partnerID=8YFLogxK
U2 - 10.1016/S1002-0160(17)60363-1
DO - 10.1016/S1002-0160(17)60363-1
M3 - Article
AN - SCOPUS:85036614676
SN - 1002-0160
VL - 28
SP - 873
EP - 883
JO - Pedosphere
JF - Pedosphere
IS - 6
ER -