Monitoring of Large-Grained Rice Agrophytocenoses in Connection with Their State

High quality rice grain can be obtained using the appropriate strategy in field cultivation technology. This requires, first of all, monitoring the state of rice crops so that rice growers can make a decision on the correct regime of nitrogen nutrition during the period of crop formation. The task of our research was to study the formation of crops of large-grain rice varieties and conduct their geoinformation monitoring of their condition. Studies of the productivity of rice crops using a UAV with a multispectral camera to check their optical and biological characteristics were carried out at the production site “FSC Rice”. At the same time, small varietal differences in the formation of the aboveground mass of plants and different reduction of shoots were found, which influenced the density of the stem. When checking the relationship of the optical characteristics of rice cultivars with the morphophysiological characteristics of plants and their productivity, a positive relationship was established between the vegetation index (NDVI) and the readings of photosynthetic activity and nitrogen content. The dependence of the yield of rice crops on the vegetation index is confirmed by the linear regression equation. This makes it possible to reliably make predictions about the productivity of rice crops based on their physiological state, using remote sensing data.