Predicting variation in plant N-uptake in three fields using soil organic matter, texture and Near Infrared Reflectance (NIR) spectroscopy

J. Wetterlind; B. Stenberg; A. Jonsson

Predicting variation in plant N-uptake in three fields using soil organic matter, texture and Near Infrared Reflectance (NIR) spectroscopy

In: Precision Agriculture â05

Authors:

J. Wetterlind

J. Wetterlind Division of Precision Agriculture, Department of Soil Science, SLU, PO Box 234, SE-532 23 Skara Sweden

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B. Stenberg

B. Stenberg Division of Precision Agriculture, Department of Soil Science, SLU, PO Box 234, SE-532 23 Skara Sweden

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, and

A. Jonsson

A. Jonsson Division of Precision Agriculture, Department of Soil Science, SLU, PO Box 234, SE-532 23 Skara Sweden

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Type:: Chapter

Pages:: 337â344

DOI:: https://doi.org/10.3920/978-90-8686-549-9_042

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Adjustment of nitrogen fertiliser according to the within-field variation in N- mineralization during the growing season can reduce costs and decrease nutrient losses to the environment. The ability to predict that variation, particularly at low cost, is therefore of interest. In this study, SOM, texture and Near Infrared Reflectance (NIR)-spectroscopy were evaluated as tools for prediction of plant N-uptake using cross-validated PLS (Partial Least Squares) models. In 2 out of 3 fields, models based on NIR-spectra alone or in combination with SOM and texture gave predictions with r² from 0.5 to 0.9 and average errors of cross-validation between 10 and 30 kg N ha^-1. Including NIR did not improve the results in calibrations based on SOM and texture in the third field with very low r² (<0.1). The results indicate that NIR and SOM plus clay are able to predict N-uptake with similar r². Increasing the number of samples would be expected to improve the NIR-calibrations and reduce the need for separate clay and SOM measurements in addition to NIR.

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Precision Agriculture â05

E-Book ISBN:: 9789086865499

Publisher:: Wageningen Academic

Print Publication Date:: 24 Oct 2005

Subjects
- Life Sciences
  - General
  - Agriculture & Environment

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Predicting variation in plant N-uptake in three fields using soil organic matter, texture and Near Infrared Reflectance (NIR) spectroscopy

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