Using spectral reflectance data of corn in estimating fodder and vegetation characteristics
2010
Hmeidan, Gh.Y. | Abood, M.A.
The corn crop (Zea mays) was planted under levels of irrigation [100% (6991 m31h), 50 and 25%] and nitrogen fertilization [100% (120 fertilizing unite/h), 50 and 25%]. Spectral reflectance data are measured during wavelength rang from 350 to 2500 nm in 2150 wave bands where width band is I nm. All wave bands were analysed and summarized in spectral channels and NDVI is derived. Simultaneously spectral, vegetation and pasture data were collected each 7-15 days from planting., Results Indicated to , Inversely relationship between the channel 672 nm and N fertilizing levels until silking after that the relationship increased strongly. ,Direct relationship between the channel 872 nm and irrigation levels during growth stages. , Direct relationship between NDVI with irrigation levels, firstly and N fertilizing during growth stages. , Spectral models were designed and suggested to estimate some fodder and vegetation characteristics during corn growth; as chlorophyll (CH): CH = -14.076 Ln (A672) - 20.909; fresh weight (FW): FW = 4.1076 e7,448 (A 872) Dry weight (DW): DW = 0.6276 e7.712 (A+ 872); and leaf area index (LAI): LAI = 0.4382e3.°721ndm.
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