Peanut Leaf Wilting Estimation From RGB Color Indices and Logistic Models

Abstract

Peanut ( Arachis hypogaea L.) is an important crop for United States agriculture and worldwide. Low soil moisture is a major constraint for production in all peanut growing regions with negative effects on yield quantity and quality. Leaf wilting is a visual symptom of low moisture stress used in breeding to improve stress tolerance, but visual rating is slow when thousands of breeding lines are evaluated and can be subject to personnel scoring bias. Photogrammetry might be used instead. The objective of this article is to determine if color space indices derived from red-green-blue (RGB) images can accurately estimate leaf wilting for breeding selection and irrigation triggering in peanut production. RGB images were collected with a digital camera proximally and aerially by a unmanned aerial vehicle during 2018 and 2019. Visual rating was performed on the same days as image collection. Vegetation indices were intensity, hue, saturation, lightness, a ∗ , b ∗ , u ∗ , v ∗ , green area (GA), greener area (GGA), and crop senescence index (CSI). In particular, hue, a ∗ , u ∗ , GA, GGA, and CSI were significantly ( p ≤ 0.0001) associated with leaf wilting. These indices were further used to train an ordinal logistic regression model for wilting estimation. This model had 90% accuracy when images were taken aerially and 99% when images were taken proximally. This article reports on a simple yet key aspect of peanut screening for tolerance to low soil moisture stress and uses novel, fast, cost-effective, and accurate RGB-derived models to estimate leaf wilting.

Plant phenotyping relevance

RGB画像から落葉萎凋という植物状態を推定する手法の開発・評価が研究の中心であり、育種選抜への応用も検証しているため。

Code and data availability

The paper describes RGB image collection, Breedpix/Fiji index extraction, and SAS logistic modeling, but provides no public deposit of its images, wilting ratings, trained models, or analysis code. The only URLs cited (CIMMYTopensoftware, Fiji, FAOSTAT) are third-party tools or generic statistics sources, not paper-own

No evidence-backed public reproduction asset is currently recorded.