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Nutrient Cycling in Agroecosystems

, Volume 84, Issue 1, pp 81–92 | Cite as

Dung pads increase pasture production, soil nutrients and microbial biomass carbon in grazed dairy systems

  • Sharon Rose Aarons
  • Catherine R. O’Connor
  • Hossein M. Hosseini
  • Cameron J. P. Gourley
Research Article

Abstract

In grazing systems dung is an important source of nutrients which can increase soil fertility and contribute to nutrient cycling through increased pasture production. Changes in soil chemical and biological properties and pasture production were measured below and around dung pads created in the field. Almost 65% of the total dung P remained after 45 days and about two-thirds of the pad fresh weight had disappeared in that time, indicating that physical degradation is the mechanism of incorporation of dung P. All the pads bar one were completely degraded by 112 days. At this time, soil pH and EC increased under dung pads as did Olsen extractable inorganic phosphorus (Pi) and total phosphorus (Pt), with these changes observed at 0–5 and 5–10 cm depths. Bicarbonate extractable soil organic phosphorus (Po) was not affected by dung and the observed differences in soil Po:Pi ratios were largely influenced by the substantial addition of inorganic P from dung. Dung increased the P buffering capacity of the 0–5 cm soil samples collected at the end of the experiment, potentially contributing to the increased extractable soil P measured under the pads. Dung also changed soil properties in 0–10 cm samples with increases in soil pH, EC, Colwell P and Colwell K recorded even long after the dung had completely disappeared. Microbial biomass carbon increased under dung pads in the 0–10 cm soil samples in the first 45 days after pads were applied. Total herbage production and ryegrass biomass increased significantly under and around the pads by 112 days after dung was applied. The botanical composition changed significantly with increased ryegrass contents observed, but only under the dung pads. This experiment demonstrated that increases in pasture around dung pads in the field are not solely due to animal rejection.

Keywords

Olsen phosphorus Colwell potassium Electrical conductivity Faeces Nutrient cycling Manure pH Ryegrass 

Notes

Acknowledgments

We thank Mr. Murray Hannah for advice regarding experimental design and statistical analysis and Mrs Sue Laidlaw who assisted with laboratory analyses. Dr. Karen Beauchemin kindly commented on early drafts of this manuscript. Constructive comments by anonymous reviewers also contributed to improving this manuscript. This research was supported by Dairy Australia (project DAV392) and the Victorian Department of Primary Industries.

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Copyright information

© Springer Science+Business Media B.V. 2008

Authors and Affiliations

  • Sharon Rose Aarons
    • 1
  • Catherine R. O’Connor
    • 2
  • Hossein M. Hosseini
    • 3
  • Cameron J. P. Gourley
    • 1
  1. 1.Future Farming Systems Research Division, Department of Primary IndustriesEllinbank CentreEllinbankAustralia
  2. 2.Ballance Agri-Nutrients LtdInvercargillNew Zealand
  3. 3.Assisstant Professor of Soil Science, Faculty of Soil and WaterTehran UniversityKarajIran

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