Effect of Different Urine Cow Nitrogen Rates and Different Moisture Conditions on Nitrogen Mineralization in an Andisol from Southern Chile

A - Papers appearing in refereed journals

Ramirez-Sandoval, M., Pinochet, D., Rivero, M. J. and Cardenas, L. M. 2022. Effect of Different Urine Cow Nitrogen Rates and Different Moisture Conditions on Nitrogen Mineralization in an Andisol from Southern Chile. Agronomy. 13 (1), p. 10. https://doi.org/10.3390/agronomy13010010

AuthorsRamirez-Sandoval, M., Pinochet, D., Rivero, M. J. and Cardenas, L. M.
Abstract

Urea present in cattle urine contributes large amounts of nitrogen (N) to grazed pastures, which can be an equivalent to approximately 1000 kg N ha−1. However, there are no studies in volcanic soils of southern Chile on the effect of different concentrations of urinary N deposited in the soil, nor of different wetting and drying conditions mimicking the variation of weather conditions on the nitrification process, from urea to NH4+ and total oxidized nitrogen (TON), throughout time. In addition, the inhibition on nitrification driven by the accumulation of NH3 at high rates of N applied to an Andisol have not been evaluated. Fresh cattle urine was applied at three different rates of N equivalent to 247 kg N ha−1 (Low N), 461 kg N ha−1 (Medium N), 921 kg N ha−1 (High N), and de-ionized water as Control. Further, three moisture conditions were imposed: constant moisture (CM), drying-rewetting (DRW) cycles at 7 days interval, and soil drying (SD). Destructive soil cores samples were evaluated for top and bottom halves individually every 7 days over a 36-d period to measure changes on inorganic N and pH. There were no interaction effects for N rates and soil moisture. The main effect of the different rates of N on mineralization was significant throughout the incubation period, while the effect of the different moisture conditions was var-iable over time. The High N was associated with elevated NH3 concentrations and could explain that total N mineralization was partially inhibited. These results suggest that the presence of different nitrifying microorganisms in the soil under different chemical and physical conditions determines nitrification, thus, the oxidation of ammonia should be studied in more detail as the first step of nitrification, specifically in volcanic soils.

KeywordsVolcanic grassland soil; Cow urea hydrolysis; Soil moisture; Urine nitrogen rate
Year of Publication2022
JournalAgronomy
Journal citation13 (1), p. 10
Digital Object Identifier (DOI)https://doi.org/10.3390/agronomy13010010
Web address (URL)https://www.mdpi.com/2073-4395/13/1/10
Open accessPublished as ‘gold’ (paid) open access
FunderBiotechnology and Biological Sciences Research Council
Natural Environment Research Council
Funder project or codeS2N - Soil to Nutrition - Work package 2 (WP2) - Adaptive management systems for improved efficiency and nutritional quality
AgZero+
Publisher's version
Output statusPublished
Publication dates
Online21 Dec 2022
Publication process dates
Accepted16 Dec 2022
PublisherMDPI
ISSN2073-4395

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