Evaluation of ground-level and space-borne sensor as tools in monitoring nitrogen nutrition status in immature and mature oil palm |
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| Authors: | Amiratul Diyana Amirruddin Daljit Singh Karam |
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| Institution: | 1. Department of Agriculture Technology, Universiti Putra Malaysia, Serdang, Malaysia;2. Laboratory of Plantation Science and Technology, Institute of Plantation Studies, Universiti Putra Malaysia, Serdang, Malaysia;3. Department of Land Management, Universiti Putra Malaysia, Serdang, Malaysia |
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| Abstract: | Monitoring nitrogen (N) in oil palm is crucial for the production sustainability. The objective of this study is to examine the capability of visible (Vis), near infrared (NIR) and a combination of Vis and NIR (Vis + NIR) spectral indices acquired from different sensors for predicting foliar N content of different palm age groups. The N treatments varied from 0 to 2 kg per palm, subjected according to immature, young mature and prime mature classes. The Vis + NIR indices from the ground level-sensor that is green + red + NIR (G + R + NIR) was the best index for predicting N for immature palms (R2 = 0.91), while Vis indices blue + red (B + R) and Green Red Index from the space-borne sensor were significantly useful for N assessment of young and prime mature palms (R2 = 0.70 and 0.50), respectively. The application of vegetation indices for monitoring N status of oil palm is beneficial to examine extensive plantation areas. |
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| Keywords: | ground-level nitrogen oil palm space-borne |
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