Primena modela za izračunavanje gubitaka prinosa gajenih biljaka u zavisnosti od sastava, brojnosti i vremena suzbijanja korova

Abstract

Program of Integrated Weed Management (IWM) involves a combination of different methods (agrotechnical, mechanical, biological, genetic and chemical) for efficient and eco­nomical weed control. Successful implementation of the concept of integrated weed control is not possible without knowledge about characteristics of weeds and crop, and weed emergence dynamics. The yield loss of cultivated plants depends of many factors, of which the most im­portant is crop density, the number of weeds and soil fertility. The dependence of yield loss can be explored through the understanding effects of one weed species and different weed species ('mixed infestation') to yield loss. Research can be empirical and mechanistic, and the results of these studies can be used to predict yield loss, at an acceptable level of accuracy through the use of mathematical models. It is important to determine which is the optimal time to remove weeds. One of the first steps in the conception of the integrated weed control is to identify the critical period for weed control (CPWC). Knowing of this period is used to make decisions about the need for control, time of control, and all depending on the specific crop. A critical period for weed control is defined as the time period between two stages of crop growth within which it is necessary to perform the weed control, in order to prevent yield loss greater than 5%.