Evaluation of bean desiccation plants with diquat and glufosinate-ammonium using terrestrial hyperspectral sensor

Abstract

The purpose of this study was to describe and compare the spectral response of common beans desiccated with diquat and glufosinate-ammonium (GLA) using a hyperspectral terrestrial sensor and report how the desiccants influence dry bean visual appearance. Bean plants were desiccated with two different types of diquat and GLA desiccants. After the measurements of the spectral curves were carried out, from these values the indices of vegetation and derivatives were calculated, the chlorophyll content of the leaves on the days of the campaign was also measured. After harvesting the grains, some qualitative variables of the grains, such as cooking time and color, were evaluated Vegetation indices (VIs) in the near-infrared and mid-infrared regions of the spectrum (wavelength locations of 705, 750, 860, and 1240 nm) were significantly different between desiccant treatments (p≤0.05) two days after application (DAA). Desiccant application caused chlorophyll degradation as detected at the wavelength of 650 and 800 nm at DAA 1. The red edge and first derivatives showed that crop injury was higher in the diquat treatment because peak magnitude for this treatment became smaller over time. The desiccant application negatively affected seed quality, resulting in smaller Hue values and longer cooking time (CT). Hue angle correlated negatively with plant water content variation and CT Our results suggest that hyperespectral terrestrial sensing can differentiate the effects caused by the desiccants, showing that ammonium glufosinate causes less damage to seed quality and the water loss is like the control group