Water and three citrate extractants were used to measure the solubility of a range of novel iron and aluminium containing superphosphate fertilizers and rock phosphates that are being investigated for use on P leaching acid sands in SW Australia. Various measures of P dissolution of the fertilizers in these extractants were related to agronomic performance. The fertilizers were evaluated in pot trials with subterranean clover in which leaching conditions were maintained. All correlations between plant response parameters and fertilizer solubility measurements were negative, probably due to losses of water-soluble P from the drained pots, thus the less soluble fertilizers were most effective. Water (1h extraction r = −0.72) and neutral ammonium citrate (0.5h extraction r = −0.54) provided the best predictions of fertilizer effectiveness.
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Deeley, D.M., Yeates, J.S. & Gilkes, R.J. Chemical testing procedures for poorly soluble P fertilizers used on acid leaching sands. Fertilizer Research 14, 101–111 (1987). https://doi.org/10.1007/BF01066603
- chemical extraction of fertilizers
- relative effectiveness
- rock phosphates