Biodiversity of Segetal Weed Communities when Chlorsulfuron-Based Weed Control is Being Used on Continuous Winter Wheat

Abstract

The purpose of the study was to determine the relationship between herbicide rate and weed community biodiversity in continuous wheat. A six-year field experiment was conducted to examine the effect of four chlorsulfuron rates in comparison with untreated (the control) plots, on the status and severity of weed infestation - in successive study years of cultivating winter wheat in monoculture. In addition, the following indices were calculated: Shannon-Wiener and Simpson’s index of biodiversity, and Simpson’s index of domination. A total of 36 weedy species were identified in the experimental plots. The richest segetal communities were established in the control plots. An application of herbicide reduced the biodiversity of the agrophytocensosis. A short-term monoculture did not impoverish the species richness of the weed community established in winter wheat. The average number of species in the community was significantly greater in the second study year. In the initial study years of monoculture, the biodiversity of the segetal community increased markedly compared with rotation-based cultivation. The calculated indices of biodiversity were not significantly affected by herbicide rate or monoculture but the indices confirmed the trends outlined by an analysis of the status and level of weed infestation.

Impact of chemical weed management in sugar beet ( Beta vulgaris) on productivity, quality and economics

“…The weed population in untreated control plots was noted by recording the number of plants per square meter in early July each year. The data was used to assess the biodiversity of weed communities in sugar beet by means of the Margalef diversity index (DMg), the Shannon index (H') and Simpson`s index of diversity (D) (Pawlonka et al 2014;Iglesias-Rios and Mazzoni 2014). A comparative analysis of the weed community structure was carried out based on the Sorensen coefficient of similarity index (Ss) (Hammond and Pokorný 2020).…”

Effect of the Time of Herbicide Application and the Properties of the Spray Solution on the Efficacy of Weed Control in Maize (Zea mays L.) Cultivation

“…The total number of species in all plots was determined, the weed species in the studied areas were marked, and the number of individuals belonging to respective taxon was determined and they were classified to the appropriate phytosociological system [60]. The species composition of weed communities and the number of plants of each species from the untreated control plots were used to assess the biodiversity by means of the Simpson (D), Shannon−Wiener (H'), and Margalef's (K) indexes [61,62] according to formulas:…”

Autumn Application of Synthetic Auxin Herbicide for Weed Control in Cereals in Poland and Germany

“…The total number of species in all plots was determined, and the weed species in the studied areas were marked. The species composition of weed communities and the number of plants of each species from the untreated control plots were used to assess the biodiversity by means of the Simpson (D), Shannon-Wiener (H ), Margalef's (K) [21,22], and Berger-Parker (d) [23] indexes according to formulas:…”