avkastning och kväveupptag
Mattsson, Lennart
(2006).
Kväveintensitet i korn.
Uppsala:
(NL, NJ) > Dept. of Soil Sciences (until 081001) > Div. of Soil Fertility and Plant Nutrition, Sveriges lantbruksuniversitet.
Rapport / Sveriges lantbruksuniversitet, Institutionen för markvetenskap, Avd. för växtnäringslära
; 212
[Report]
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Official URL: http://www-mv.slu.se/vaxtnaring/forsok/
Abstract
More than 1000 field experiments with nitrogen to spring barley conducted over a period from 1967 to 2004 were investigated. Only one year experiments were included. Yields and N off-take were measured. Three types of production functions were estimated on an experiment wise level. Second and 3rd degree polynomials were considered together with a 3rd degree polynomial combined with a straight line from the inflexion point of the curve. Yields are generally larger today than they were in the mid 60s. This holds both for control treatments and for N fertilized treatments. It implies that the efficiency of N has increased over the years. In other words, the yield increase kg-1 N has increased. Currently a yield increase with 600 kg grain 40 kg-1 N is obtained as an average in the range 40-120 kg N. Similarily, the grain N response to N fertilizer was 0.13 percentage units 40 kg-1 N equal to 0.8 percentage units protein. Yields decline from south to north Sweden while the highest grain N contents were observed in north Sweden. The N off-take averaged over all N-levels was the largest in south Sweden with 75 kg ha-1 N. In north Sweden it was just above 60 kg ha-1. It could be confirmed experimentally that barley after cereals required more N for economical optimum yields than after e.g. a leguminous crop or oil-seeds. The difference was approximately 15 kg ha-1 N. With today's prices applied on the current response curves and on those 30 years ago it was shown that the most economic N fertilization level today is nearly twice that of the 70ies.
Authors/Creators: | Mattsson, Lennart |
---|---|
Title: | Kväveintensitet i korn |
Subtitle: | avkastning och kväveupptag |
Series Name/Journal: | Rapport / Sveriges lantbruksuniversitet, Institutionen för markvetenskap, Avd. för växtnäringslära |
Year of publishing : | 2006 |
Number: | 212 |
Number of Pages: | 43 |
Place of Publication: | Uppsala |
Publisher: | Institutionen 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 > Soil science |
Keywords: | produktionsfunktioner, regioner |
URN:NBN: | urn:nbn:se:slu:epsilon-1-7 |
Permanent URL: | http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-1-7 |
ID Code: | 3126 |
Department: | (NL, NJ) > Dept. of Soil Sciences (until 081001) > Div. of Soil Fertility and Plant Nutrition |
Deposited By: | Lennart Mattsson |
Deposited On: | 13 Dec 2007 00:00 |
Metadata Last Modified: | 02 Dec 2014 10:19 |
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