Use of Selected Spectral Ratios to Assess the Response of Pineapple to Potassium Nutrition

Balasundram, Siva K. and Yen, Mee Chong (2021) Use of Selected Spectral Ratios to Assess the Response of Pineapple to Potassium Nutrition. Journal of Smart Science and Technology, 1 (1): 2. pp. 1-7. ISSN 2785-924X


Potassium (K) nutrition in pineapple grown on tropical peat can be problematic due to high precipitation which encourages leaching losses. Non-destructive tools that can assess K deficiency and the accompanying changes in biophysical and biochemical properties within pineapple is a good strategy to employ. In this study, we assessed the biophysical changes in pineapple (var. MD2) in response to different K rates by using a hyperspectral approach. K deficiency was detected at 171 days after planting. Shortage of K also exhibited a shift in red edge towards shorter wavelengths between 500-700 nm. In addition, spectral ranges of 430-680 nm, as well as 680-752 nm were found to be most effective in differentiating spectral response to varying K rates. Three vegetation indices, i.e. Normalized Pigment Chlorophyll Index (NPCI), Plant Senescence Index (PSRI) and Red-edge Vegetation Index (RVSI) were found to best describe K treatment effects on pineapple canopy reflectance. This study could be extended further to include pineapple varieties other than MD2, and also key nutrients, such as N and P, for better fertilizer management in peatgrown pineapple.


Item Type: Article
Email / ID Num.
Balasundram, Siva K.
Yen, Mee Chong
Journal or Publication Title: Journal of Smart Science and Technology
UiTM Journal Collections: UiTM Journal > Journal of Smart Science and Technology (JSST)
ISSN: 2785-924X
Volume: 1
Number: 1
Page Range: pp. 1-7
Keywords: K response; Spectral indices; Pineapple canopy reflectance
Date: September 2021
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