Linking manure properties to phosphorus solubility in calcareous soils: Importance of the manure carbon to phosphorus ratio

Leytem, A.B. and Turner, B.L. and Raboy, V. and Peterson, K.L. (2005) Linking manure properties to phosphorus solubility in calcareous soils: Importance of the manure carbon to phosphorus ratio. Soil Science Society of America Journal. 69:1516-1524.

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Abstract

Land application of manure can increase P transfer in runoff,
although the risk depends in part on the characteristics of the manure.
We assessed this for calcareous soils using manures from swine (Sus
domesticus) fed one of five barley varieties (Hordeum vulgare L.),
including four low phytate mutants and a normal variety, to produce
manures with a range of total P (6.8-4.9 g P water-soluble P
(4.3-8.0 g P kg-'), total N/P ratios (2.5:1-5.5:1), and total C/P ratios
(31:1-67:1). Two experiments were conducted. First, manures were
incorporated into three soils on a N (150 mg N kg-' soil) or P (27.5 mg
P kg-1 soil) basis three times during a 7-wk incubation. Second, 10
additional soils were incubated for 2 wk following a single P-based
manure application (82.5 mg P kg-i soil). Water and NaHCO3 (Olsen)
extractable P were determined at regular intervals, with microbial
P determined by fumigation-extraction after each incubation. For
N-based application (i.e., variable P amendment), extractable P increased
with total P applied. For P-based applications, the increase
in soil P was more closely correlated to microbial P concentration than
manure P composition or soil properties. These results suggest that
stimulation of the microbial biomass by added organic C is important
in determining soil P solubility following manure application.

Item Type:	Article
NWISRL Publication Number:	1164
Subjects:	Manure > Chemistry Soil > Calcareous soil Soil > Chemistry > Phosphorous Mass Import - autoclassified (may be erroneous)
Depositing User:	Users 5 not found.
Date Deposited:	20 Nov 2010 21:49
Last Modified:	02 Nov 2016 18:47
Item ID:	17
URI:	https://eprints.nwisrl.ars.usda.gov/id/eprint/17