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Kväveintensitet i höstvete vid olika förutsättningar

Mattsson, Lennart (2004). Kväveintensitet i höstvete vid olika förutsättningar. 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 ; 209
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Official URL: http://www-mv.slu.se/vaxtnaring/forsok/Noptimum/ra...

Abstract

In order to collect as much data as possible about N response in winter wheat, Swedish field experimental results from 1966 to 2002 were collected and arranged in a data-base together with information about N fertiliser application, localization, clay content and preceding crops. Nitrogen responses were analysed regarding these factors. Only results from single or occasionally double dressings were used. In the latter case there was one early application at DC 25, and one later at DC 35. Results from 689 experiments were analysed. When going from south to north in winter wheat growing areas the yields declined but there was an increase in the most profitable N-rate with up to 20 kg N ha-1. Preceding crop influenced the yield level and the N response considerably. Wheat following autumn sown oil seeds, leys, peas and fallow gave the largest yields but the lowest N responses in comparison with cereals, or spring sown oil seeds as preceding crops. A typical pattern for N response with respect to clay contents of the soils could not be found. Analyses of the effects with time from 1966 to 2002 showed that yield responses for N increased with time. This is mainly an effect of improved varieties and improved agronomic techniques. Although the N offtake was shown to increase with time, a general decrease in grain N content was observed.

Authors/Creators:Mattsson, Lennart
Title:Kväveintensitet i höstvete vid olika förutsättningar
Series/Journal:Rapport / Sveriges lantbruksuniversitet, Institutionen för markvetenskap, Avd. för växtnäringslära (0348-3541)
Year of publishing :2004
Number:209
Number of Pages:35
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:Produktionsfunktioner, Optimal N-giva, Kväveeffekt
URN:NBN:urn:nbn:se:slu:epsilon-1-11
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-1-11
ID Code:3160
Department:(NL, NJ) > Dept. of Soil Sciences > Div. of Soil Fertility and Plant Nutrition
Deposited By: Lennart Mattsson
Deposited On:06 Feb 2008 00:00
Metadata Last Modified:02 Dec 2014 10:19

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