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Site-specific nitrogen fertilization demand in relation to plant available soil nitrogen and water

potential for prediction based on soil characteristics

Delin, Sofia (2005). Site-specific nitrogen fertilization demand in relation to plant available soil nitrogen and water. Diss. (sammanfattning/summary) Skara : Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae, 1652-6880 ; 2005:6
ISBN 91-576-7005-6
[Doctoral thesis]

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In precision agriculture, inputs are adjusted to the varying demand across a field in order to optimize net returns and avoid losses to the environment. For site-specific N application, it is useful to know how fertilizer N demand, plant available soil N (Np, i.e. soil N taken up by plants) and potential yield relate to each other and to different soil characteristics within a field. A 3-year field investigation was carried out on a 15-ha arable field with large soil texture differences in south-west Sweden, on which winter wheat and spring barley were grown. Variation in Np was considerable both within the field and between years but could only partly be explained by variations in soil organic matter, clay and elevation. Maps of yield, grain protein content and Np differed between years, partly due to differences in seasonal variation in soil moisture. Together, protein and yield maps indicated where N supply was sufficient and where factors other than N were limiting, which allowed the accuracy of the N fertilization to be evaluated retrospectively. Differences in yield response to N between areas with different soil texture were small when soil moisture was sufficient. In a dry year, yields were smaller at sandy sites, while in a wet year Np, and thereby yield, was lower on clayey sites. Soil moisture is related to soil electrical conductivity (SEC) and elevation, which are easily measured densely within the field. Therefore, these parameters are useful for dividing the field into zones with different risks for drought and waterlogging and can be used for variable N application, assuming that the season can be defined as dry, normal or wet at the time of fertilization. Average values in zones created from a densely measured variable proved to be a better alternative for many variables in this field than interpolation of sparsely collected soil data without respect to distinct borders.

Authors/Creators:Delin, Sofia
Title:Site-specific nitrogen fertilization demand in relation to plant available soil nitrogen and water
Subtitle:potential for prediction based on soil characteristics
Series Name/Journal:Acta Universitatis Agriculturae Sueciae
Year of publishing :2005
Number of Pages:55
ALLI. Delin, S. & Söderström, M. 2003. Performance of soil electrical conductivity and different methods for mapping soil data from a small dataset. Acta Agriculturae Scandinavica, Section B. Soil and Plant Science 52, 127-135. II. Delin, S. & Lindén, B. 2002. Relations between net nitrogen mineralization and soil characteristics within an arable field. Acta Agriculturae Scandinavica, Section B. Soil and Plant Science 52, 78-85. III. Delin, S. 2004. Within-field variations in grain protein content – relationships to yield and soil nitrogen and consistency in maps between years. Precision Agriculture 5, 565-577. IV. Delin, S., Lindén, B. & Berglund, K. 2004. Yield and protein response to fertilizer nitrogen in different parts of a cereal field: potential of site-specific fertilization. European Journal of Agronomy (published online). V. Delin, S. & Berglund, K. 2005. Management zones classified with respect to drought and waterlogging. (Submitted to Precision Agriculture)
Place of Publication:Skara
ISBN for printed version:91-576-7005-6
Publication Type:Doctoral thesis
Full Text Status:Public
Agris subject categories.:F Plant production > F01 Crop husbandry
F Plant production > F04 Fertilizing
Subjects:Not in use, please see Agris categories
Agrovoc terms:nitrogen cycle, mineralization, grain, cereals, protein content, nitrogen fertilizers, site factors, agricultural soils, cultivation, sweden
Keywords:cereal production, grain protein content, grain yield, nitrogen fertilization, nitrogen mineralization, plant available water, precision agriculture, site-specific crop management
Permanent URL:
ID Code:730
Department:(NL, NJ) > Dept. of Soil Sciences (until 081001)
Deposited By: Sofia Delin
Deposited On:18 Jan 2005 00:00
Metadata Last Modified:02 Dec 2014 10:06

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