medelvärden 1990-2006
Mattsson, Lennart
(2007).
Mineraliskt kväve i marken.
Technical Report.
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
; 215
[Report]
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Official URL: http://www-mv.slu.se/vaxtnaring/forsok/VNrapporter...
Abstract
Soil mineral N (min-N) analyses from Swedish agricultural soils were compiled from 1990 to 2006. All the data originate from field experiments with different N-levels throughout the country. All values refer to the 0-60 cm layer and in-clude both NH4-N and NO3-N. Altogether 316 spring sampled analyses on mineral soils, were compiled. The average was 40 kg ha-1 of which 12 kg was NH4-N. On spring sampled sites on bare soils the average was 47 kg whereas on sites with a winter crop growing min-N was 34 kg ha-1. Looking on spring sampled sites with bare soils and spring cereals cropped the preceding year min-N was 46 kg compared with 54 when winter cereals were cropped. After root crops like sugar beets min-N was 29 kg ha-1 on average. On sites with growing winter cereals min-N was similar regardless of preceding crops. Correlations between N-rates with best net return and min-N showed that adjust-ments of N-rates for for spring cereals with ± 0,7 kg ha-1 for each kg deviation in min-N from average values could be recommended. For winter cereals ±0,5 is recommended.
Authors/Creators: | Mattsson, Lennart |
---|---|
Title: | Mineraliskt kväve i marken |
Subtitle: | medelvärden 1990-2006 |
Series Name/Journal: | Rapport / Sveriges lantbruksuniversitet, Institutionen för markvetenskap, Avd. för växtnäringslära |
Year of publishing : | 2007 |
Number: | 215 |
Number of Pages: | 20 |
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 > Soil science |
Keywords: | Kvävegödsling, Optimal N-giva |
URN:NBN: | urn:nbn:se:slu:epsilon-1-64 |
Permanent URL: | http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-1-64 |
ID Code: | 3331 |
Department: | (NL, NJ) > Dept. of Soil Sciences (until 081001) > Div. of Soil Fertility and Plant Nutrition |
Deposited By: | Lennart Mattsson |
Deposited On: | 26 Jun 2008 00:00 |
Metadata Last Modified: | 02 Dec 2014 10:20 |
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