TITLE:
Evaluation of Available Phosphorus by Soil Test Methods in an Acidic Soil Incubated with Different Levels of Lime and Phosphorus
AUTHORS:
Ashoka Sarker, Md. Abul Kashem, Khan Towhid Osman, Imam Hossain, Farzana Ahmed
KEYWORDS:
Available P; Extraction Methods; Lime; Phosphorus; Incubation
JOURNAL NAME:
Open Journal of Soil Science,
Vol.4 No.3,
March
14,
2014
ABSTRACT: An incubation study was conducted in
laboratory to determine the effect of lime (L) as CaCO3 and
phosphorus (P) as TSP on soil pH and available soil P in an acid soil. Four
rates of L equivalent to 0, 1, 2 and 3 ton CaCO3 ha-1 and
four rates of P equivalent to 0, 25, 50 and 75 mg P kg-1 were
applied in combinations as treatments. The soil was incubated at field capacity
for 8 weeks (wk) after which they were extracted using NaHCO3 (Olsen), Mehlich-3, Kelowna and Bray & Kurtz-1 extractants and soil pH was determined. Lime
significantly (P -1 gave the highest available
phosphorus. Mehlich-3 method extracted the largest amount of P (14.54 - 67.35
mg·kg-1) while Olsen extracted the smallest amount (3.25 - 32.77 mg·kg-1).
The mean extractable P in soils was found to be in the order of Olsen 2 = 0.87 to 0.95).