MULTISPECTRAL SHEET DIAGNOSTICS OF TECHNOLOGICAL STRESSES ON WINTER RAPES CROPS
DOI:
https://doi.org/10.33730/2310-4678.3.2020.212610Abstract
Technological stresses are an urgent challenge for winter crops and in particular rapeseed in industrial
production and in the mass use of agrochemicals and plant protection products. Effective resuscitation
measures are possible only in the initial stages of the growing season and require reliable and accessible
information about the condition of crops. The purpose of the work is to develop an index based on the results
of analysis of multispectral images with high spatial resolution, obtained by UAVs for the identification
of technological stresses. During field research on October 30, 2019, it was found that in the affected areas,
the plants have an abnormal color of the two lower leaves, namely yellow and red. To identify affected
plants, it was proposed to use an image of the object based on the ratio of several channels simultaneously, which allow to distinguish between affected and healthy plants, soil and leaves of abnormal color. It
is proposed to use the RRL (rape red leaf) indices, which are an indicator of the technological nature of
stress, namely RRLgr, designed exclusively for the optical range and the RRLm index (green — G, red — R,
border red — Re and near infrared — NIR). Such indices are convenient for monitoring the condition of
rapeseed crops and automated data processing. It was found that when monitoring rapeseed crops in the
growing season of 6–8 leaves affected by technological stress, using Slantrange 3p height of 100 m, for the indices RRLgr and RRLm is characterized by abnormal leaf color, which was recorded in 1.5 and 2.1%
of the total area of plants on the site, respectively. The use of multispectral analysis makes it possible to
differentiate the identification of technological stresses with different manifestations of impression. At
a standard flight altitude for Slantrange 3p of 100 m with the fixation of anomalous color in 1.5% of the
total area of winter oilseed rape plants is the basis for the organization of additional ground inspection of
the identified areas of winter oilseed rape crops.
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