A - Papers appearing in refereed journals
Ramirez-Sandoval, M., Pinochet, D., Rivero, M. J. and Cardenas, L. M. 2022. Effect of Cow Urine Nitrogen Rates and Moisture Conditions on Nitrogen Mineralization in Andisol from Southern Chile. Agronomy. 13 (1), p. 10. https://doi.org/10.3390/agronomy13010010
Authors | Ramirez-Sandoval, M., Pinochet, D., Rivero, M. J. and Cardenas, L. M. |
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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. |
Keywords | Volcanic grassland soil; Cow urea hydrolysis; Soil moisture; Urine nitrogen rate |
Year of Publication | 2022 |
Journal | Agronomy |
Journal citation | 13 (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 access | Published as ‘gold’ (paid) open access |
Funder | Biotechnology and Biological Sciences Research Council |
Natural Environment Research Council | |
Funder project or code | S2N - Soil to Nutrition - Work package 2 (WP2) - Adaptive management systems for improved efficiency and nutritional quality |
AgZero+ | |
Publisher's version | |
Output status | Published |
Publication dates | |
Online | 21 Dec 2022 |
Publication process dates | |
Accepted | 16 Dec 2022 |
Publisher | MDPI |
ISSN | 2073-4395 |
Permalink - https://repository.rothamsted.ac.uk/item/98qyz/effect-of-cow-urine-nitrogen-rates-and-moisture-conditions-on-nitrogen-mineralization-in-andisol-from-southern-chile