Low-altitude aerial photography for optimum N fertilization of winter wheat on the North China Plain
| dc.date.accessioned | 2007-05-15T13:27:07Z | |
| dc.date.available | 2007-05-15T13:27:07Z | |
| dc.date.issued | 2004 | |
| dc.identifier.issn | 0378-4290 | |
| dc.identifier.uri | urn:nbn:de:hebis:34-2007051518219 | |
| dc.identifier.uri | http://hdl.handle.net/123456789/2007051518219 | |
| dc.format.extent | 99568 bytes | |
| dc.format.mimetype | application/pdf | |
| dc.language.iso | eng | |
| dc.rights | Urheberrechtlich geschützt | |
| dc.rights.uri | https://rightsstatements.org/page/InC/1.0/ | |
| dc.subject | Greenness intensity | eng |
| dc.subject | Image analysis | eng |
| dc.subject | Nitrogen use efficiency | eng |
| dc.subject | Sap nitrate | eng |
| dc.subject | Wheat | eng |
| dc.subject.ddc | 630 | |
| dc.title | Low-altitude aerial photography for optimum N fertilization of winter wheat on the North China Plain | eng |
| dc.type | Aufsatz | |
| dcterms.abstract | 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. | eng |
| dcterms.accessRights | open access | |
| dcterms.bibliographicCitation | In: Field crops research. Amsterdam : Elsevier. 89.2004, H. 2, S. 389-395 | |
| dcterms.creator | Jia, L. | |
| dcterms.creator | Bürkert, Andreas | |
| dcterms.creator | Chen, X. | |
| dcterms.creator | Roemheld, V. | |
| dcterms.creator | Zhang, F. | |
| dc.description.everything | The original publication is available at www.elsevier.com | eng |
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