Trends in community evolution of zea mays agrocenoses at different levels of anthropogenic impacts

Abstract

The conceptual model "Phytosanitary optimization of agrophytocenoses" involves monitoring the crops of the main agricultural crops. The purpose of monitoring is to determine the core of the most harmful weed plant species, as a basis for the development of an integrated plant protection system. The object of the research was the process of community evolution in zea mays agrophytocenoses, in the conditions of the south of the Nonchernozem zone. Geobotanical materials were analyzed on the rounds of surveys of corn crops. The work used an experimental method - field ecological surveys, and theoretical research methods - information analysis and mathematical statistics (Jaccard index, S?rensen coefficient, Spearman's rank correlation coefficient, Kendall rank correlation coefficient). The monitoring carried out proved that over the 90-year period of cultivation, a core of weediness was formed, based on annual late spring weeds, which were absent during the period of extensive farming. The group of creeping perennial weed remained unchanged in all the years of the surveys; this feature must be taken into account when developing a system of protective measures. At present, agrophytocenoses contain the most harmful rhizome and creeping perennial weed, early spring and late spring species.