Authors:
F. V. EROSHENKO, doctor of biological sciences, head of department,
I. G. STORCHAK, candidate of agricultural sciences, senior research fellow,
E. O. SHESTAKOVA, postgraduate student,
North-Caucasian Federal Scientific Agrarian Center (49 Nikonova str., 356241, Mikhailovsk, Stavropol territory; e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it., This email address is being protected from spambots. You need JavaScript enabled to view it., This email address is being protected from spambots. You need JavaScript enabled to view it.).
Abstract. The established NDVI connections with the yield of winter wheat for such territories as the region, soil-climatic zone and the region (region) are not generally preserved for individual fields. Therefore, the study of the influence of one of the most important characteristics of photosynthetic productivity – the chlorophyll content in plants on NDVI – may allow us to develop methods for evaluating the productivity of crops according to remote sensing data. The aim of the studies was to establish the relationship between the chlorophyll content in winter wheat plants and the vegetative index NDVI for the conditions of the Stavropol Territory. The work was carried out in 2011–2014 on the fields of industrial crops of Stavropol Scientific Research Institute of Agriculture. We analyzed the correlation between the relative content of green pigments in a biomass unit, in the unit area of the assimilation surface, as well as their gross quantity on 1 square meter of sowing and NDVI fields. Which showed that a stable link (reverse) is observed only in the case of the amount of chlorophyll per unit of biomass (mg/g), which is estimated at an average of ‒0.79. With the rest of the indicators, it is either unstable or completely absent. The negative values of the correlation coefficients obtained are explained by the fact that the maximum amount of chlorophyll in the plants of winter wheat is observed in the initial periods of growth and development, and then there is the so-called growth dilution, which is accompanied by a decrease in the amount of green pigments in a biomass unit, with NDVI growing. Thus, between the relative content of chlorophyll in plants of winter wheat and the vegetative index NDVI, there is a sufficiently high and stable inverse relationship.
Keywords: vegetative index, NDVI, winter wheat, chlorophyll, photosynthetic productivity, grain yield.
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