| Title: |
Phosphorus requirements of tropical grazing systems: the northern Australian experience |
| Authors: |
McIvor, John G; Guppy, Christopher; School of Environmental and Rural Science; orcid:0000-0001-7274-607X; Probert, Merv E |
| Publisher Information: |
Springer Netherlands |
| Publication Year: |
2011 |
| Collection: |
University of New England at Armidale, New South Wales, Australia: e-publications@UNE |
| Subject Terms: |
Crop and Pasture Nutrition; Animal Nutrition; Soil Chemistry (excl Carbon Sequestration Science) |
| Description: |
Background and aims: Extensive grazing is common on low phosphorus (P) soils in tropical areas. In this study we aimed to use experience and research results from northern Australia to investigate methods to manage low P status to efficiently raise animals without exploiting soil P resources. Scope: Simple "farm-gate" P balances were calculated for four cattle breeding and growing operations. Estimated P balances were slightly negative (outputs>inputs) for extensive breeding operations (0.02 to 0.04 kg/ha/year depending on P supplementation), slightly positive for a system growing young animals with small annual P fertilizer applications, and negative for a mixed grazing-cropping enterprise. In northern tablelands pastoral environments, responses to P application have remained unchanged over the last 50 years, with >80% of paddocks remaining P limited. Liveweight gain responses to P fertilizer in most experiments have been inputs) for extensive breeding operations (0.02 to 0.04 kg/ha/year depending on P supplementation), slightly positive for a system growing young animals with small annual P fertilizer applications, and negative for a mixed grazing-cropping enterprise. In northern tablelands pastoral environments, responses to P application have remained unchanged over the last 50 years, with >80% of paddocks remaining P limited. Liveweight gain responses to P fertilizer in most experiments have been 80% of paddocks remaining P limited. Liveweight gain responses to P fertilizer in most experiments have been |
| Document Type: |
article in journal/newspaper |
| Language: |
English |
| Relation: |
https://hdl.handle.net/1959.11/9513; une:9704 |
| Availability: |
https://hdl.handle.net/1959.11/9513 |
| Accession Number: |
edsbas.409528AF |
| Database: |
BASE |