Assessing the spectral separability of flue cured tobacco varieties established on different planting dates and under varying fertilizer management levels
Masuka, Anxious J.
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The NDVI was used to discriminate tobacco variety, assess fertilizer levels, and determine the impact of planting date on separating crops. A split plot design with four planting dates, September, October, November, and December, as main plots, variety as subplot, and fertilizer treatments as sub-subplots was used. Radiometric measurements were taken from 5m × 5m sampling plots, using a multispectral radiometer. The September, October, and November crops had significant variety x fertilizer treatment differences (𝐹 < 0.05) fromthe age of 10 weeks. T 66 and KRK26 varieties had similar (𝐹 > 0.05) NDVI values and these were greater (𝐹 < 0.5) than those for K E1. The 100% and the 150% fertilizer treatments were similar (𝐹 > 0.05) and both were greater (𝐹 < 0.05) than the 50% fertilizer treatments. All of the fertilizer and variety treatments at the December planting dates had similar reflectance characteristics (𝑃 > 0.05), which were lower (𝑃 < 0.05) than the September and October planting dates.The results showed that planting dates, varieties, and fertilizer levels could be distinguished using spectral data. Weeks 10-11 and 15 after the start of the experiment were optimal for separating the planting date effect.
Additional Citation InformationSvotwa, E., Masuka, A. J., Maasdorp, B. & Murwira, A. (2014). Assessing the spectral separability of flue cured tobacco varieties established on different planting dates and under varying fertilizer management levels. International Journal of Agronomy, 2014, 1-9.