creators_name: Askegaard, Margrethe
creators_name: Eriksen, Jørgen
type: journalp
datestamp: 2003-01-27
lastmod: 2009-08-20 14:18:47
metadata_visibility: show
title: Exchangeable potassium in soil as indicator of potassium status in an organic crop rotation on loamy sand.  
ispublished: pub
subjects: 2farming
full_text_status: restricted
abstract: In organic agriculture, where K may be a limited resource, reliable tools are important in the assessment of K availability in the soil in order to avoid K deficiency.  We investigated the effect of four organic farming systems on the exchangeable K in the plough layer of a six-course crop rotation from 1994 to 1997. The accumulated K balances over the four years varied between 
-49 and  +120 kg K ha-1 and the corresponding exchangeable K (0-20 cm) in autumn 1997 was 7.1 and 9.6 mg K 100 g soil-1, respectively, as an average of the crop rotation. The exchangeable K fraction responded to the K application in manure and to the crop in the rotation. In an additional experiment, no yield response to K was found, despite a low level of exchangeable K. The exchangeable K was a useful indicator of changes in the K status in the farming system with the largest positive K balance whereas this K fraction was insufficient as an indicator in the other three farming systems. The considerable variation of exchangeable K through the crop rotation makes the soil test method most suitable at the crop rotation level where fluctuations caused by crop and management are smoothed out.

date: 2002
date_type: published
publication: Soil Use and Management
volume: 18
pagerange: 84-90
refereed: yes
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citation: Askegaard, Margrethe and Eriksen, Jørgen (2002) Exchangeable potassium in soil as indicator of potassium status in an organic crop rotation on loamy sand. Soil Use and Management, 18, pp. 84-90.
document_url: http://orgprints.org/391/1/AE2002.pdf