Assessment of Napropamide Dissipation and its Effect on Soil Enzymatic Activity

Abstract

This paper assesses the dissipation of napropamide and its impact on the activity of dehydrogenases, alkaline phosphatase, acid phosphatase, and urease in sandy clay loam. The experiment was carried out on soil samples with organic carbon content of 12.08 g·kg -1 , total nitrogen content of 0.97 g·kg -1 , and pH 5.24 with the following variable factors: (a) dose of Devrinol 450 SC formation (containing 450 g of napropamide in dm 3 ): 0 (control), 0.5, 1, 2, 4, 8, and 16-fold hold of field dose; (b) day of experiment: 1, 7, 14, 28, 56, and 112. The half-life of napropamide ranged from 33.50 to 71.42 days. The use of napropamide at the dose recommended by the manufacturer and at the dose reduced by half appeared to exhibit low toxicity in relation to enzymes determined. In contrast, the application of elevated napropamide doses decreased the values of biochemical parameters of the soil in most cases. The Pearson's correlation coefficients showed statistically significant negative correlation between the content of napropamide residues and the enzymatic activity of the soil.

Dynamics of phosphorus content and the activity of phosphatase in forest soil in the sustained nitrogen compounds emissions zone

“…According to many authors (Bielińska et al 2013 ; Bartkowiak et al 2017 ; Błońska et al 2017 ; Onyszko et al 2017 ; Lemanowicz et al 2018 ), the enzymatic tests facilitate the evaluation of both the effect of natural factors and the human impact on ecosystem functioning. The highest activity of acid phosphatase resulted from the fact that phosphomonoesterases are enzymes most susceptible to changes in soil reaction (Dick et al 2000 ), the optimum pH of soil for the activity of alkaline phosphatase was 9.0–11.0, and for acid phosphatase, 4.0–6.5.…”

Changes in microbiological properties of soil during fungicide degradation

“…A reduction of enzyme activity could be the effect of destroying microorganisms living in soil by an excessive amount of fungicides (Ye et al 2018). Inhibition of soil enzyme activity was also proved by Onyszko et al (2017). They reported that the application of excessive doses of napropamide demonstrated high toxicity towards dehydrogenases, acid phosphatase, alkaline phosphatase and urease.…”