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Potassium budgets in grassland systems as affected by nitrogen and drainage

Alfaro, M. A., Jarvis, S. C. and Gregory, P. J. (2003) Potassium budgets in grassland systems as affected by nitrogen and drainage. Soil Use and Management, 19 (2). pp. 89-95. ISSN 0266-0032

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To link to this item DOI: 10.1079/sum2002172

Abstract/Summary

The main inputs, outputs and transfers of potassium (K) in soils and swards under typical south west England conditions were determined during 1999/00 and 2000/01 to establish soil and field gate K budgets under different fertilizer nitrogen (N) (0 and 280 kg ha(-1) yr(-1)) and drainage (undrained and drained) treatments. Plots receiving fertilizer N also received farmyard manure (FYM). Potassium soil budgets ranged, on average for the two years, from -5 (+N, drained) to +9 (no N and undrained) kg K ha(-1) yr(-1) and field gate budgets from +23 (+N, drained) to +89 (+N, undrained). The main inputs and outputs to the soil K budgets were fertilizer application (65%) and plant uptake (93%). Animals had a minor effect on K export but a major impact on K recycling. Nitrogen fertilizer application and drainage increased K uptake by the grass and, with it, the efficiency of K used. It also depleted easily available soil K, which could be associated with smaller K losses by leaching.

Item Type:Article
Divisions:Faculty of Science > School of Archaeology, Geography and Environmental Science
Interdisciplinary centres and themes > Soil Research Centre
ID Code:3171
Uncontrolled Keywords:potassium nitrogen drainage grassland soils nutrient balance SOIL FERTILITY DAIRY FARM LOSSES ECOSYSTEM PATHWAYS FORMS
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