Repositorio
Institucional

Palma, Graciela

Spuler, Maria J.

Jorquera, Milko

Briceno, Gabriela

Effects of the Combined Application of Nitrogen Fertilizer and 2,4-D on Nitrification Ammonia Oxidizers and Herbicide Bioavailability in a Volcanic Soil. A Microcosm Study

SPRINGER INT PUBL AG

JOURNAL OF SOIL SCIENCE AND PLANT NUTRITION

en

Purpose2,4-D (2,4-dichlorophenoxy acetic acid) is an herbicide used in weed control worldwide, however, there is no information regarding its effects on the nitrification process in volcanic soils fertilized with urea and how its bioavailability can be modified during this process.MethodsThis study was carried out under microcosm incubation of an Andisol amended with an equivalent field dose of 200 kg N ha(-1) and 0.672 kg 2,4-D ha(-1) for 30 days. In this study were evaluated the changes produced on enzymatic activity, nitrogen kinetic mineralization, ammonia-oxidizing bacteria (AOB) abundance and herbicide persistence. Additionally, a 2,4-D adsorption study was carried out in batch with urea application.ResultsThe main results on fertilized soils show that 2,4-D stimulated temporarily urease and dehydrogenase activity. Herbicide application increased N-NH4+ concentration by approximately 23%, and N-NO3- significantly decreased by 18%, compared to fertilized soil. The abundance of AOB amoA gene decreased at all times. On the other hand, 2,4-D adsorption decreased by urea application, but its persistence was not affected, with a low half-life of approximately 4 days.ConclusionsThis study indicated that 2,4-D influences the urea mineralization process by increasing ammonium and decreasing nitrate levels as a consequence of increased urease activity and the inhibition of AOB populations. On the other hand, the bioavailability of 2,4-D decreased due to the pH modifications produced by the application of urea. In general, we conclude that the combined application of fertilizers and some herbicides should be studied to estimate the efficacy and environmental effect of both agrochemicals.

2023

artículo original

10.1007/s42729-023-01350-z

PDF

Urea hydrolysis

Urea mineralization

AmoA gene

Postemergence herbicides

Soil acidification

Ciencias Vegetales

Ciencias Ambientales y Ecología

Agricultura

Hidrólisis de urea

Mineralización de urea

gen AmoA

Herbicidas de postemergencia

Acidificación del suelo

4309.0

4317

artículo original

versión publicada

restringido

restringido

WOS:001014533900001

0718-9508

verde / hibrido

Ciencias Vegetales

Ciencias Ambientales y Ecología

Agricultura

UFRO DI20-0051