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Predicting protein content of silage maize using remotely sensed multispectral imagery and proximal leaf sensing

Published online by Cambridge University Press:  04 November 2022

Nikrooz Bagheri Open the ORCID record for Nikrooz Bagheri [Opens in a new window] ,
Maryam Rahimi Jahangirlou  and
Mehryar Jaberi Aghdam
Nikrooz Bagheri*
Affiliation:
Agricultural Engineering Research Institute, Agricultural Research, Education and Extension Organization (AREEO), Karaj, Iran
Maryam Rahimi Jahangirlou
Affiliation:
Department of Agronomy and Plant Breeding Sciences, College of Aburaihan, University of Tehran, Tehran, Iran
Mehryar Jaberi Aghdam
Affiliation:
Department of Agronomy, Varamin-Pishva Branch, Islamic Azad University, Varamin, Iran
*
*Corresponding Author. Email: n.bagheri@areeo.ac.ir
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Abstract

Timely estimation of silage maize protein provides an effective decision to adapt optimized strategies for nitrogen fertilizer management and also harvesting time for farmers. So, this research aimed to investigate whether using vegetative indices (VIs) derived from UAV remotely sensed multispectral (with 520–900 nm wavelengths) imagery and also Soil Plant Analysis Development (SPAD) greenness index can be used to detect the leaf protein concentration (LPC) of silage maize, as a function of various nitrogen rates (0, 50, 100, and 150% of recommended dosage). Results of principal component analysis (PCA) suggested that LPC was highly correlated with leaf greenness index in all developmental stages. In addition, LPC was highly correlated with most of the VIs investigated. A PCA clustering showed the meaningful pattern of N rates. Higher LPC values, VIs, and greenness index were more concentrated in the higher nitrogen (N100% and N150%) sectors. Nitrogen Reflectance Index (NRI) was identified as the most important VIs to monitor and predict LPC in the silage maize field, showing a strong polynomial relationship with LPC in both eight-leaf collar (V8) (R2 = 0.81, p ≤ 0.01) and tasseling (VT) (R2 = 0.98, p ≤ 0.001) stages. In addition, among VIs, the Normalized Difference Vegetation Index (NDVI) demonstrated a significant linear regression relationship with LPC (R2 = 0.80, p ≤ 0.01) in the VT. Findings suggested the high potential of VIs extracted by UAV-taken multispectral imagery and also SPAD proximal sensing to help farmers rapidly diagnose LPC in silage maize, in line with the objectives of precision farming.

Keywords

NitrogenRemote sensingPrecision agricultureProteinUnmanned Aerial Vehicle (UAV)
Type
Research Article
Information
Experimental Agriculture , Volume 58 , 2022 , e41
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Copyright
© The Author(s), 2022. Published by Cambridge University Press

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