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Pethoxamid dissipation and microbial activity and structure in an agricultural soil: Effect of herbicide rate and organic residues

AuthorsRodríguez Cruz, M. Sonia ; Pose Juan, Eva ; Marín Benito, Jesús María ; Igual, José Mariano ; Sánchez Martín, M. Jesús
Dehydrogenase activity
PLFA analysis
Issue DateAug-2019
CitationApplied Soil Ecology 140: 135-143 (2019)
AbstractSoil is a non-renewable resource, and its degradation compromises human health, 2 natural ecosystems, and even the climate. The application of organic amendments and 3 herbicides is commonplace in agriculture, and their impact on soil fertility needs to be 4 evaluated. Therefore, the objective was to evaluate the effect on soil microbial activity 5 and structure of amendments, sewage sludge (SS) and green compost (GC), and the rate 6 of herbicide pethoxamid applied (2, 10 and 50 mg kg-1). Herbicide dissipation kinetics, 7 soil dehydrogenase activity (DHA) and the profile of phospholipid-derived fatty acids 8 (PLFAs) extracted from the soil have been determined in unamended (S) and amended 9 (S+SS and S+GC) soils. The dissipation curves of pethoxamid applied at the three rates 10 closely fitted a single first order kinetics model in all the soils. The dissipation rate 11 decreased with the rate applied in the order 2 mg kg-1 > 10 mg kg-1 > 50 mg kg-1 in 12 unamended and amended soils. However, the half-life or time required for 50% 13 dissipation (DT50) of pethoxamid was not significantly different in unamended and 14 amended soils when applied at 2 and 10 mg kg-1, but it was lower in the amended soils 15 than in the unamended one when the herbicide was applied at the highest rate. The 16 highest DHA mean values were obtained in S+GC treated with pethoxamid at 2, 10 and 17 50 mg kg-1; however, DHA was lower in S+SS than in S. Peak DHA values were 18 observed in S and S+GC soils treated with pethoxamid at 2 mg kg-1 at 15 days of 19 incubation, and in S, S+GC and S+SS treated with the herbicide at 10 and 50 mg kg-1 at 20 35 days of incubation. These peak DHA values are close to 50% of herbicide 21 dissipation. A statistical analysis of the PLFA results has revealed significant effects for 22 sampling time in all the soils, for the pethoxamid rate, and for the interaction between 23 time and pethoxamid rate only in S+GC and S+SS. The application of organic 24 amendments to soil accelerated the dissipation of higher rates of pethoxamid compared to the unamended soil, which is important to prevent the herbicide’s negative impacts 26 on the soil microbial community.
Description36 páginas, 3 tablas y 4 figuras . -- The final version is available at http://www.elsevier.com
Publisher version (URL)https://doi.org/10.1016/j.apsoil.2019.04.011
Appears in Collections:(IRNASA) Artículos
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