Assessing the effectiveness of manure export plus intensive silage cropping for lowering the O lsen‐ P status of P ‐enriched grassland

Assessing the effectiveness of manure export plus intensive silage cropping for lowering the O... A substantial proportion of farmed grassland soils in Northern Ireland (NI) are overly enriched with P and pose a risk to water quality. To address this problem, manure could be exported rather than recycled to P‐enriched land and the latter intensively cropped with grass silage to deplete soil P. To assess the efficacy of such a strategy, a P‐ and K‐enriched grassland site was intensively cropped over a 6‐yr period with fertilizer N alone supplied to support silage growth. By year 6, soil P had declined from index 5 to index 3, and it was estimated that two more years of this management may bring it into the target index 2 range. Soil K, however, declined rapidly from index 4 to index 1 in just 4 yr, with the result that grass production became limited by K deficiency. It was concluded that nonrecycling of manure to P‐enriched grassland under silage management is probably the most effective strategy for lowering soil P status, but care must be taken to prevent K deficiency occurring. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Soil Use and Management Wiley

Assessing the effectiveness of manure export plus intensive silage cropping for lowering the O lsen‐ P status of P ‐enriched grassland

Soil Use and Management, Volume 31 (4) – Dec 1, 2015

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Publisher
Wiley
Copyright
Journal compilation © 2015 British Society of Soil Science
ISSN
0266-0032
eISSN
1475-2743
D.O.I.
10.1111/sum.12226
Publisher site
See Article on Publisher Site

Abstract

A substantial proportion of farmed grassland soils in Northern Ireland (NI) are overly enriched with P and pose a risk to water quality. To address this problem, manure could be exported rather than recycled to P‐enriched land and the latter intensively cropped with grass silage to deplete soil P. To assess the efficacy of such a strategy, a P‐ and K‐enriched grassland site was intensively cropped over a 6‐yr period with fertilizer N alone supplied to support silage growth. By year 6, soil P had declined from index 5 to index 3, and it was estimated that two more years of this management may bring it into the target index 2 range. Soil K, however, declined rapidly from index 4 to index 1 in just 4 yr, with the result that grass production became limited by K deficiency. It was concluded that nonrecycling of manure to P‐enriched grassland under silage management is probably the most effective strategy for lowering soil P status, but care must be taken to prevent K deficiency occurring.

Journal

Soil Use and ManagementWiley

Published: Dec 1, 2015

References

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