Mattsson, Lennart
- Department of Soil Sciences, Swedish University of Agricultural Sciences
Abstract
Plant available P extracted with a ammonium-lactate solution with pH 3.75 known as the AL-method has been used extensively in Sweden since the beginning of the 1960ies. Interpretation and fertilizer requirement decisions based on analysis data are commonly done without consideration of actual soil data information. An investigation of field experiment data from 72 different sites with altogether 360 experimental yields was carried out in order to find out if and how the variation in the relative P fertilizer could be explained by considering pH, clay content and organic matter content at those sites and the relationship to varying P-AL-values. Both multi-variate-analysis and classical statistical methods were used. Soil organic matter content and soil pH infiuenced the P-fertilizer effect statistically significantly. The effect increased with increasing soil organic matter but decreased with increasing pH. The infiuence of both parameters declined when P-AL increased. On light textured soils (clay3 % and pH8 there were generally only small effects of P-fertilizer. An improvement of the information value of P-AL can be achieved if pH and organic matter content is considered. The quantification of this remains to be carried out
Keywords
Fosforanalys; pH-värde; Lerhalt; Mullhalt
Published in
Rapport / Sveriges lantbruksuniversitet, Institutionen för markvetenskap, Avd. för växtnäringslära
2001, number: 202
Publisher: Inst. för markvetenskap, Sveriges lantbruksuniversitet
SLU Authors
UKÄ Subject classification
Agricultural Science
Permanent link to this page (URI)
https://res.slu.se/id/publ/17918