Expression of Variability in Corn as Influenced by Growth Stage Using Optical Sensor Measurements

Improving crop management inputs with remote sensing devices is an emerging technology. This study documented the progression of the normalized difference vegetative index (NDVI) during the life cycle of corn (Zea mays L.), evaluated the spatial variability of corn growth in terms of the CV (calcula...

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Bibliographic Details
Published in:Agronomy journal 2007-03, Vol.99 (2), p.384-389
Main Authors: Martin, K.L, Girma, K, Freeman, K.W, Teal, R.K, Tubana, B, Arnall, D.B, Chung, B, Walsh, O, Solie, J.B, Stone, M.L
Format: Article
Language:English
Subjects:
Agronomy. Soil science and plant productions
Biological and medical sciences
color
corn
crop management
developmental stages
dry matter accumulation
Fundamental and applied biological sciences. Psychology
grain yield
plant density
plant growth
remote sensing
spatial variation
spectral analysis
Zea mays
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Summary:Improving crop management inputs with remote sensing devices is an emerging technology. This study documented the progression of the normalized difference vegetative index (NDVI) during the life cycle of corn (Zea mays L.), evaluated the spatial variability of corn growth in terms of the CV (calculated from NDVI readings), and documented the relationships between NDVI, CV (calculated from NDVI), and grain and biomass yields and plant density. Four rows, 30 m in length, from two locations during 2 yr were randomly selected for this study. An optical sensor was used to collect NDVI readings at multiple growth stages during the life cycle of corn. The NDVI increased with progression of vegetative growth stages until V10, where a plateau was encountered, followed by a decline in NDVI after the VT growth stage. Coefficient of variation data from the NDVI readings revealed two dominant peaks during the life cycle of corn, one between the V6 and V8 growth stages and the second during the late reproductive growth stages. The CV data illustrated that the greatest variation expressed by corn during the vegetative growth stages was between the V6 and V8 growth stages. The highest correlation of NDVI with corn grain yield was found at the V7 to V9 growth stages; likewise, CV and plant density were also more highly correlated from V7 to V9. The CV from NDVI readings was highly correlated with grain and biomass yields at all growth stages.
ISSN:0002-1962
1435-0645
DOI:10.2134/agronj2005.0268