Kväveintensitet i korn
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 de...
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ftslunivuppsala:oai:pub.epsilon.slu.se:3126 2024-06-09T07:48:28+00:00 Kväveintensitet i korn Mattsson, Lennart 2006 application/pdf https://pub.epsilon.slu.se/3126/ https://pub.epsilon.slu.se/3126/1/rapport212.pdf http://www-mv.slu.se/vaxtnaring/forsok/ swe swe https://pub.epsilon.slu.se/3126/1/rapport212.pdf Mattsson, Lennart (2006). Kväveintensitet i korn. Uppsala: (NL, NJ) > Dept. of Soil Sciences (until 081001) > Div. of Soil Fertility and Plant Nutrition <https://pub.epsilon.slu.se/view/divisions/4023F.html>, Sveriges lantbruksuniversitet. Rapport / Sveriges lantbruksuniversitet, Institutionen för markvetenskap, Avd. för växtnäringslära 212 [Report] Soil science Report NonPeerReviewed 2006 ftslunivuppsala 2024-05-16T04:09:07Z 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. Report North Sweden Swedish University of Agricultural Sciences (SLU): Epsilon Open Archive Korn ENVELOPE(159.267,159.267,58.408,58.408) |
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Open Polar |
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Swedish University of Agricultural Sciences (SLU): Epsilon Open Archive |
op_collection_id |
ftslunivuppsala |
language |
Swedish |
topic |
Soil science |
spellingShingle |
Soil science Mattsson, Lennart Kväveintensitet i korn |
topic_facet |
Soil science |
description |
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. |
format |
Report |
author |
Mattsson, Lennart |
author_facet |
Mattsson, Lennart |
author_sort |
Mattsson, Lennart |
title |
Kväveintensitet i korn |
title_short |
Kväveintensitet i korn |
title_full |
Kväveintensitet i korn |
title_fullStr |
Kväveintensitet i korn |
title_full_unstemmed |
Kväveintensitet i korn |
title_sort |
kväveintensitet i korn |
publishDate |
2006 |
url |
https://pub.epsilon.slu.se/3126/ https://pub.epsilon.slu.se/3126/1/rapport212.pdf http://www-mv.slu.se/vaxtnaring/forsok/ |
long_lat |
ENVELOPE(159.267,159.267,58.408,58.408) |
geographic |
Korn |
geographic_facet |
Korn |
genre |
North Sweden |
genre_facet |
North Sweden |
op_relation |
https://pub.epsilon.slu.se/3126/1/rapport212.pdf Mattsson, Lennart (2006). Kväveintensitet i korn. Uppsala: (NL, NJ) > Dept. of Soil Sciences (until 081001) > Div. of Soil Fertility and Plant Nutrition <https://pub.epsilon.slu.se/view/divisions/4023F.html>, Sveriges lantbruksuniversitet. Rapport / Sveriges lantbruksuniversitet, Institutionen för markvetenskap, Avd. för växtnäringslära 212 [Report] |
_version_ |
1801380186550173696 |