Effect of annual use of pesticides on soil microorganisms and sugar beet yields

Abstract

Sugar beet is often cultivated for several years on the same fields, using many pesticides. We have therefore studied the effects of a pesticide programme on soil microorganisms and sugar beet yields in Perniö and Laukaa. The pesticides in use were thiram, hymexazol, dimethoate, phenmedipham and metamitron and, in Laukaa only, alloxidim-Na. Pesticides were used either in the normal doses or at 150 % of the normal dose. The normal doses of pesticide application had a favourable effect on sugar beet yields in both experiments. The sugar yield was higher in plots with the normal pesticide doses than in the control plots. The overdoses increased neither the sugar beet yields nor the sugar yields as compared to the normal plots. The soil microorganisms were affected by pesticides in some but not in all cases. The most sensitive were the ureolytic microorganisms and the dehydrogenase activities.

Effects of commonly used pesticides (demond, granland and safacol) on non-targeted organisms (wheat plant, soil nematodes, microfungi and aerobic mesophilic bacteria) in Muş Province, Turkey

“…In terms of aerob mesophilic bacteria, pesticides were found to have more or less toxic effects. The findings of this study were relatively parallel with Ubuoh et al (2012), Güven and Koç (2020a) and AL-Ani et al (2019, Ören et al (2009, Ekundayo (2003), Heinonen-Tanski et al (1989), Yousaf et al (2013), Lo (2010), Arora and Sahni (2016), Aries and Aid (2019) and Wesley et al (2017). Based on the findings obtained, different results (such as positive, negative and neutral) were obtained, depending on the type and dose of the drug used and the parameter considered.…”

“…When evaluated in terms of microfungi; the treatments were found to have more or less positive effects on the number of microfungi. Although some of the findings in this study were contrary to the suggestions proposed by AL-Ani et al (2019), Ubuoh et al (2012) and Küçük et al (2009), they were substantially consistent with Wesley et al (2017), Arora and Sahni (2016), Arora et al (2019), Ören et al (2009), Heinonen-Tanski et al (1989 and Koç and Yardım (2019). In terms of aerob mesophilic bacteria, pesticides were found to have more or less toxic effects.…”

“…Arora and Sahni (2016) reported that microorganisms react differently to different pesticides. Heinonen-Tanski et al (1989) reported that soil microorganisms were affected by pesticides used in their studies in some cases, but not in all cases. Lo (2010) stated that pesticides have different effects against soil microorganisms due to their different structure.…”