
TY  - JOUR
A1  - Aarons, S. R. 
A1  - Hosseini, H. M. 
A1  - Dorling, L. 
A1  - Gourley, C. J. P. 
T1  - Dung decomposition in temperate dairy pastures. II. Contribution to plant-available soil phosphorus
JF  - Soil Research
JO  - Soil Res.
Y1  - 2004
VL  - 42
IS  - 1
SP  - 115
EP  - 123
KW  - manure, faeces, degradation, inorganic, organic, microbial flush, P sorption.
UR  - https://doi.org/10.1071/SR03009 
N2  - Changes in dung and soil inorganic and organic P pools were measured in an experiment investigating the effects of dung on soil properties in 2 grazed dairy pasture systems (low and high input). Total dung P and bicarbonate-extractable P pools were measured in decomposing pads and compared with the changes in inorganic and organic bicarbonate-extractable soil P, P sorption, and microbial P flush of soils beneath dung pads and control &#39;pads&#39; where nothing was applied. Bicarbonate-extractable total P in the dung pads declined to the same level in both systems by the last sample date. Organic P comprised a similar proportion (36%) of the bicarbonate-extractable total P pool in dung from both low and high input systems. However, the transformations of dung P were different in each system, with the bicarbonate-extractable total P in the low input dung increasing by 25% before declining, and a greater decrease in percentage bicarbonate-extractable organic P in this system.Bicarbonate-extractable soil organic P did not vary under dung pads despite the large increases in Olsen and Colwell P observed. Soil Olsen P trends observed in the low and high input systems indicate a potential for leaching losses of P in high input systems compared with low. This increase in soil Olsen P was not due to decreased P sorption as dung did not reduce the sorption capacity of the soil. Microbial soil P increased under dung pads only after 60 days in this experiment. Neither the organic P nor microbial P pools contributed significantly to soil labile P pools in these temperate dairy pasture systems. The transformations of P thought to occur during the decomposition of dung are discussed. 
ER  -

