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Mineraliskt kväve i marken

medelvärden 1990-2006

Mattsson, Lennart (2007). Mineraliskt kväve i marken. Technical Report. 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 ; 215
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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/Journal:Rapport / Sveriges lantbruksuniversitet, Institutionen för markvetenskap, Avd. för växtnäringslära (0348-3541)
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 > 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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