Accelerated testing of nutrient release rates from fertiliser granules
Cristy M. Warrender A , Garry W. Warrender A , Bradley Smith B , Colin McKenzie B and Robert G. Gilbert A CA The University of Queensland, CNAFS/School of Land Crop & Food Sciences, Brisbane, Qld 4072, Australia.
B CSBP Limited, PO Box 345, Kwinana, WA 6968, Australia.
C Corresponding author. Email: b.gilbert@uq.edu.au
Australian Journal of Soil Research 48(8) 668-673 https://doi.org/10.1071/SR09176
Submitted: 16 October 2009 Accepted: 25 May 2010 Published: 19 November 2010
Abstract
A method is developed for estimation of accelerated nutrient release rates into a soil from particulate fertiliser formulations, by carrying out release studies at elevated temperatures. This can provide time-saving targetting of samples to be subsequently used in field trials. The rate of total phosphorus leaching into water from a standard commercial fertiliser product embedded in grey, deep, sandy duplex soil was monitored using inductively coupled plasma-optical emission spectroscopy. The time dependence of phosphate concentration at a given temperature was found to obey simple first-order kinetics. These data fitted an Arrhenius relation within acceptable limits, enabling release rates at ambient field temperatures to be estimated significantly faster than by field experiment. A release rate calculated for the accelerated test, i.e. (1.2 ± 0.1) × 10−3/min, when compared with a more standard-type pot-trial leaching rate for the corresponding temperature of 2.3 × 10−4/min, gives a direct correlation of ~1 : 1 when corrected for concentration differences.
Additional keywords: Arrhenius, ICP-OES, leaching, kinetics, phosphate, soil.
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