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Utvidgad tolkning av P-AL för mark- och skördeanpassad fosforgödsling

Mattsson, Lennart and Börjesson, Thomas and Kjell, Ivarsson and Kjell, Gustafsson (2001). Utvidgad tolkning av P-AL för mark- och skördeanpassad fosforgödsling. Uppsala: (NL, NJ) > Dept. of Soil Sciences > Div. of Soil Fertility and Plant Nutrition, Sveriges lantbruksuniversitet. Rapport / Sveriges lantbruksuniversitet, Institutionen för markvetenskap, Avd. för växtnäringslära ; 202
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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 (clay<15%) with organic matter content >3 % and pH<6.5 soil data were effective to explain P-fertilizer variations. For PAL- values >8 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.

Authors/Creators:Mattsson, Lennart and Börjesson, Thomas and Kjell, Ivarsson and Kjell, Gustafsson
Title:Utvidgad tolkning av P-AL för mark- och skördeanpassad fosforgödsling
Series/Journal:Rapport / Sveriges lantbruksuniversitet, Institutionen för markvetenskap, Avd. för växtnäringslära (0348-3541)
Year of publishing :2001
Number:202
Number of Pages:28
Place of Publication:Uppsala
Publisher:Inst. för markvetenskap, Sveriges lantbruksuniversitet
ISSN:0348-3541
Language:Swedish
Publication Type:Report
Refereed:No
Full Text Status:Public
Subjects:Obsolete subject words > FORESTRY, AGRICULTURAL SCIENCES and LANDSCAPE PLANNING > Plant production
Obsolete subject words > FORESTRY, AGRICULTURAL SCIENCES and LANDSCAPE PLANNING > Soil science
Keywords:Fosforanalys, pH-värde, Lerhalt, Mullhalt
URN:NBN:urn:nbn:se:slu:epsilon-1-23
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-1-23
ID Code:3226
Department:(NL, NJ) > Dept. of Soil Sciences > Div. of Soil Fertility and Plant Nutrition
Deposited By: Lennart Mattsson
Deposited On:25 Apr 2008 00:00
Metadata Last Modified:02 Dec 2014 10:19

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