RT Journal T1 PHOSPHORUS SORPTION CHARACTERISTICS OF FOUR SOIL SERIES A1 R. Uddin A1 P. A. Baloch A1 S. Iqbal A1 M. A. Bhutto A1 F. K. Nizamani A1 A. H. Solangi A1 A. A. Sidiqui JF Journal of Animal and Plant Sciences JO JAPS SN 1018-7081 VO 24 IS 5 SP 1547 OP 1553 YR 2014 FD 2014/10/01 DO DOI NA AB

A study was undertaken in order to find out the effect of incubation periods of phosphorus applied in soil samples of four series i.e. Gishkori, Buzdar, Sultanpur and Tikken with varying clay contents of 52, 48, 21 and 20% collected from Dera Ismail Khan, Khyber Pakhtunkhuwa, Pakistan. Soil samples were equilibrated in 20 ml aliquot of 0.01M CaCl2 solution containing 0, 20, 40, 60, 80, 100, 120 and 140µg mL-1 of P as KH2PO4. The samples were incubated at room temperature, shaked twice a day for 30 minutes for 2, 8, 16 days and centrifuged at 10,000 rpm. The Gishkori soil series with the highest clay content adsorbed highest quantity of phosphate followed by Tikken that adsorbed the least as contained 20% clay content. For varying equilibration periods, maximum sorption took place in first two days after which little absorption was observed. The study showed that Gishkori soil needed more P addition than other soil samples for plant growth. Beckwith plots showed greater slopes for Gishkori and Buzdar soils indicating more phosphate buffering capacities which would replenish the nutrient if solution is exhausted. While, their intercepts were small at zero phosphate sorption hence solution might contain less P for plant growth.

K1 Phosphorus use efficiency, incubation, clay content, soil series, Dera Ismail Khan, Pakistan PB Pakistan Agricultural Scientists Forum LK https://thejaps.org.pk/AbstractView.aspx?mid=2014-JAPS-220