Lime effects on phosphorus availability in a calcareous soil

Westermann, D.T. (1992) Lime effects on phosphorus availability in a calcareous soil. Soil Science Society of America Journal. 56:489-494.

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Abstract

Crop yields are sometimes reduced on irrigated calcareous soils with
elevated lime concentrations. This study was conducted to determine
the influence of lime on P availability. The effects of acid-equivalent
lime concentrations and P fertilization rates on NaHCO3-soluble P,
anion resin-extractable P, P-adsorption isotherms in 0.01 M CaCl2,
and P uptake by sudangrass [Sorghum bicolor (L.) Moench] and potato
(Solanum tuberosum L.) were investigated in the greenhouse on
soil samples from the Portneuf silt loam (coarse-silty, mixed, mesic
Durixerollic Calciorthid). Plant P uptake was increased by P fertilization
and decreased by increasing lime concentration. Phosphorus
uptake was curvilinearly related to solution P (extracted by 0.01 M
CaCl2). Solution P concentrations increased linearly as the resin-extractable
P/equilibrium buffer capacity (EBC) ratio increased, where
EBC is the slope of the P-adsorption isotherm at the indigenous equilibrium
P concentration. The EBC increased as the lime concentration
increased. Phosphorus applications increased solution P and resin-extractable
P and decreased EBC within a given lime concentration.
These data indicate that the soil-test P concentration or P fertilization
rate should increase as the lime concentration increases to provide the
same degree of P availability and plant P uptake in this calcareous
soil.

Item Type:	Article
NWISRL Publication Number:	0764
Subjects:	Soil > Calcareous soil Soil > Chemistry > Phosphorous Mass Import - autoclassified (may be erroneous)
Depositing User:	Dan Stieneke
Date Deposited:	20 Nov 2010 21:53
Last Modified:	05 Dec 2016 16:54
Item ID:	572
URI:	https://eprints.nwisrl.ars.usda.gov/id/eprint/572