Abstract
Timely assessment of the state of agrocenoses is very important in agricultural production. In this regard, geographic information systems (GIS) are widely used, since they make it possible to collect, process, store and transmit data on the studied territorial objects. In particular, the data on plant development obtained from satellite images showing the Normalized Difference Vegetation Index (NDVI) changes are widely used in agriculture. Studies were conducted over two years, in 2020 in the village Tumak Sredneakhtubinsky district of Volgograd Region and in 2021 in the village of Mayskoye, near the city of Volgograd. The changes in the NDVI index were compared during different timings of potato growing seasons. The NDVI index readings obtained with the OneSoil software product were synchronized in time and location with the ground surveys. The contrast NDVI was used to determine the heterogeneity of the surface of the crop being grown. The results of the study of dynamics of values of vegetation index NDVI for potatoes grown in the dry steppe zone of the Volgograd region were presented. It was established that during the “germination - budding” period, the NDVI value increased from 0.12 to 0.51 in 2020 and from 0.12 to 0.72 in 2021. During the flowering period, the index value increased on average to 0.64 over the research period. The maximum value of the index was observed during the period of “tops growth cessation - tops wilting” and amounted to 0.75. Further, the index value decreased and in the period of full ripeness of potato tubers, it was equal to 0.6 on an average over the research period. The use of the contrast NDVI determined the heterogeneity of the index values distribution more clearly and completely, which allowed us to identify problem zones in a particular area for taking prompt measures on reduction or elimination of this heterogeneity.
Published Version
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