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    Spectral indices: In-season dry mass and yield relationship of flue-cured tobacco under different planting dates and fertiliser levels

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    Date
    2013-08-13
    Author
    Svotwa, Ezekia
    Masuka, Anxious
    Maasdorp, Barbara
    Murwira, Amon
    Type
    Article
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    Abstract
    This experiment investigated the relationship between tobacco canopy spectral characteristics and tobacco biomass. A completely randomized design, with plantings on the 15th of September, October, November, and December, each with 9 variety × fertiliser management treatments, was used. Starting from6 weeks after planting, reflectance measurements were taken fromone row, using a multispectral radiometer. Individual plants from the other 3 rows were also measured, and the above ground whole plants were harvested and dried for reflectance/dry mass regression analysis. The central row was harvested, cured, and weighed. Both the maximum NDVI and mass at untying declined with later planting and so was the mass-NDVI coefficient of determination. The best fitting curves for the yield-NDVI correlations were quadratic. September reflectance values from the October crop reflectance were statistically similar (𝑃 > 0.05), while those for the November and the December crops were significantly different (𝑃 < 0.05) fromthe former two.Mass at untying andNDVI showed a quadratic relationship in all the three tested varieties.Theoptimum stage for collecting spectral data for tobacco yield estimation was the 8–12 weeks after planting.The results could be useful in accurate monitoring of crop development patterns for yield forecasting purposes.
    URI
    http://hdl.handle.net/10646/1411
    Additional Citation Information
    Svotwa, E., Masuka, J., Maasdorp, B., & Murwira, A. (2013). Spectral Indices: In-Season Dry Mass and Yield Relationship of Flue-Cured Tobacco under Different Planting Dates and Fertiliser Levels. ISRN Agronomy, 2013. Retrieved from http://downloads.hindawi.com/journals/isrn.agronomy/2013/816767.pdf
    Publisher
    Hindawi
    Subject
    Remote sensing
    Spatial information
    Crop yield
    Spectral indices
    Tobacco planting
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    • Geography Staff Publications [13]

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