Aufsatz
Low-altitude aerial photography for optimum N fertilization of winter wheat on the North China Plain
Zusammenfassung
Previous research has shown that site-specific nitrogen (N) fertilizer recommendations based on an assessment of a soil’s N supply (mineral N testing) and the crop’s N status (sap nitrate analysis) can help to decrease excessive N inputs for winter wheat on the North China Plain. However, the costs to derive such recommendations based on multiple sampling of a single field hamper the use of this approach at the on-farm level. In this study low-altitude aerial true-color photographs were used to examine the relationship between image-derived reflectance values and soil–plant data in an on-station experiment. Treatments comprised a conventional N treatment (typical farmers’ practice), an optimum N treatment (N application based on soil–plant testing) and six treatments without N (one to six cropping seasons without any N fertilizer input). Normalized intensities of the red, green and blue color bands on the photographs were highly correlated with total N concentrations, SPAD readings and stem sap nitrate of winter wheat. The results indicate the potential of aerial photography to determine in combination with on site soil–plant testing the optimum N fertilizer rate for larger fields and to thereby decrease the costs for N need assessments.
Zitierform
In: Field crops research. Amsterdam : Elsevier. 89.2004, H. 2, S. 389-395Sammlung(en)
Publikationen (Fachgebiet Ökologischer Pflanzenbau und Agrarökosystemforschung in den Tropen und Subtropen)Zitieren
@article{urn:nbn:de:hebis:34-2007051518219,
author={Jia, L. and Bürkert, Andreas and Chen, X. and Roemheld, V. and Zhang, F.},
title={Low-altitude aerial photography for optimum N fertilization of winter wheat on the North China Plain},
year={2004}
}
0500 Oax 0501 Text $btxt$2rdacontent 0502 Computermedien $bc$2rdacarrier 1100 2004$n2004 1500 1/eng 2050 ##0##urn:nbn:de:hebis:34-2007051518219 3000 Jia, L. 3010 Bürkert, Andreas 3010 Chen, X. 3010 Roemheld, V. 3010 Zhang, F. 4000 Low-altitude aerial photography for optimum N fertilization of winter wheat on the North China Plain / Jia, L. 4030 4060 Online-Ressource 4085 ##0##=u http://nbn-resolving.de/urn:nbn:de:hebis:34-2007051518219=x R 4204 \$dAufsatz 4170 7136 ##0##urn:nbn:de:hebis:34-2007051518219
2007-05-15T13:27:07Z 2007-05-15T13:27:07Z 2004 0378-4290 urn:nbn:de:hebis:34-2007051518219 http://hdl.handle.net/123456789/2007051518219 99568 bytes application/pdf eng Urheberrechtlich geschützt https://rightsstatements.org/page/InC/1.0/ Greenness intensity Image analysis Nitrogen use efficiency Sap nitrate Wheat 630 Low-altitude aerial photography for optimum N fertilization of winter wheat on the North China Plain Aufsatz Previous research has shown that site-specific nitrogen (N) fertilizer recommendations based on an assessment of a soil’s N supply (mineral N testing) and the crop’s N status (sap nitrate analysis) can help to decrease excessive N inputs for winter wheat on the North China Plain. However, the costs to derive such recommendations based on multiple sampling of a single field hamper the use of this approach at the on-farm level. In this study low-altitude aerial true-color photographs were used to examine the relationship between image-derived reflectance values and soil–plant data in an on-station experiment. Treatments comprised a conventional N treatment (typical farmers’ practice), an optimum N treatment (N application based on soil–plant testing) and six treatments without N (one to six cropping seasons without any N fertilizer input). Normalized intensities of the red, green and blue color bands on the photographs were highly correlated with total N concentrations, SPAD readings and stem sap nitrate of winter wheat. The results indicate the potential of aerial photography to determine in combination with on site soil–plant testing the optimum N fertilizer rate for larger fields and to thereby decrease the costs for N need assessments. open access In: Field crops research. Amsterdam : Elsevier. 89.2004, H. 2, S. 389-395 Jia, L. Bürkert, Andreas Chen, X. Roemheld, V. Zhang, F. The original publication is available at www.elsevier.com
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