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Titre du document / Document title

Remote sensing of winter wheat tiller density for early nitrogen application decisions

Auteur(s) / Author(s)

FLOWERS Michael (1) ; WEISZ Randall (1) ; HEINIGER Ronnie (2) ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

(1) Dep. of Crop Sci., North Carolina State Univ., Box 7620, Raleigh, NC 27695-7620, ETATS-UNIS
(2) Dep. of Crop Sci., North Carolina State Univ., Vernon James Res. and Ext. Cent., 207 Research Rd., Plymouth, NC 27962, ETATS-UNIS

Résumé / Abstract

There is increasing evidence that scouting of winter wheat (Triticum aestivum L.) fields to determine tiller density at Growth Stage (GS) 25 is useful in deciding if N should be applied. However, to obtain an accurate average of field tiller density, frequent and intensive measurements must be made. A solution to this problem may be remote sensing. The objectives of this study were to determine (i) if a spectral index or digital counts in the near infrared (NIR), red (R), green (G), or blue (B) wavelengths could be used to estimate GS-25 tiller density across environments and (ii) if the inclusion of within-field references would improve the estimation of GS-25 tiller density for determining N recommendations. Research was conducted at four site-years in 1998 and 1999 using two wheat varieties. At three locations, a randomized replicated strip-plot design with three seeding rates was used. The fourth location was an on-farm test with one seeding rate. Spectral indices and individual NIR, R, G, and B digital counts were tested for correlation with tiller density at each site. Tiller density at GS 25 and NIR digital counts were found to be consistently correlated (0.67 ≤ r ≤ 0.87). The inclusion of within-field tiller density references resulted in a high correlation (r = 0.88) between relative tiller density and relative NIR digital counts across environments. Using relative NIR digital counts to predict tiller density would have resulted in the correct N recommendation 82% of the time.

Revue / Journal Title

Agronomy journal    ISSN  0002-1962   CODEN AGJOAT 

Source / Source

2001, vol. 93, no4, pp. 783-789 (36 ref.)

Langue / Language

Anglais

Editeur / Publisher

American Society of Agronomy, Madison, WI, ETATS-UNIS  (1949) (Revue)

Mots-clés anglais / English Keywords

Nitrogen fertilization

;

Decision aid

;

Tillering

;

Space remote sensing

;

Aerial photography

;

Planting density

;

Infrared photography

;

Color photography

;

Image analysis

;

Triticum aestivum

;

Field experiment

;

Gramineae

;

Monocotyledones

;

Angiospermae

;

Spermatophyta

;

Cereal crop

;

Mots-clés français / French Keywords

Fertilisation azotée

;

Aide décision

;

Tallage

;

Télédétection spatiale

;

Photographie aérienne

;

Densité plantation

;

Photographie IR

;

Photographie couleur

;

Analyse image

;

Triticum aestivum

;

Essai en champ

;

Gramineae

;

Monocotyledones

;

Angiospermae

;

Spermatophyta

;

Plante céréalière

;

Mots-clés espagnols / Spanish Keywords

Fertilización nitrogenada

;

Ayuda decisión

;

Amacollamiento

;

Teledetección espacial

;

Fotografía aérea

;

Densidad plantación

;

Fotografía infrarroja

;

Fotografía en color

;

Análisis imagen

;

Triticum aestivum

;

Ensayo en campo

;

Gramineae

;

Monocotyledones

;

Angiospermae

;

Spermatophyta

;

Planta cerealista

;

Localisation / Location

INIST-CNRS, Cote INIST : 553, 35400009905309.0040

Nº notice refdoc (ud4) : 1062894



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