Nutrients Balances in Beef Cattle Production Systems and Their Implications for the Environment

Alfaro, Marta; Salazar, Francisco; Oenema, O.; Iraira, Sergio; Teuber, Nolberto; Ramírez, Luis; Villarroel, Dagoberto

doi:10.4067/s0718-27912009000100004

Cited by 4 publications

(8 citation statements)

References 20 publications

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“…The optimized treatment was1.8 times more efficient in the use of N than the 450 kg N ha -1 treatment (Table 3) The NUE values were similar to those reported by Alfaro et al (2009), who reported a 66% average.…”

Section: Nuesupporting

confidence: 76%

“…The main output for all treatments was plant uptake, which represented between 90-95% of the total N outputs, in agreement with Alfaro et al (2009) andMartínez-Lagos et al (2014). Nitrogen losses by leaching and denitrification were low as they were taken from previous studies.…”

Section: N Gapsupporting

confidence: 74%

“…This will contribute to increase fertilizer use efficiency from around 40% at present (Alfaro et al, 2009) to over 80% at the soil-plant interface.…”

Section: Nuementioning

confidence: 99%

“…The main contribution of N to plant uptake in volcanic soils of southern Chile comes from organic matter mineralization. In many cases, this income represents more than 60% of total N received by the pasture, although this contribution is rarely considered when estimating nitrogen fertilizer requirements (Alfaro et al, 2009). , risking losses to the wider environment (Alfaro et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

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Soil nitrogen contribution to grasslands and its implication for nitrogen use efficiency

Ortega

Alfaro

Martínez-Lagos

2016

J. Soil Sci. Plant Nutr.

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In pasture systems of southern Chile, nitrogen (N) fertilization is mostly carried out without considering soil N supply, while seasonal N plant uptake is partially accounted for. These aspects are fundamental to correctly decide N fertilization. The aim of this work was to determine soil N contribution to grasslands yield in southern Chile and its implication for N use efficiency. Three treatments were distributed in a completely randomized block design with four replicates. A negative control treatment without N application and a positive control without N deficiency (450 kg N ha -1 ) were considered. An optimized treatment was also used, so that the total amount of mineral N applied as fertilizer was only that necessary to account for the arithmetic difference among plant uptake and N soil supply, resulting in the application of 171 kg N ha -1 only. Soil mineralization was high (241-934 kg N ha -1 ) and strongly affected by soil available N (VIP > 0.8). The 450 kg N ha -1 treatment produced 1,726 kg DM more than the 171 kg N ha -1 treatment. Nevertheless, this increase was associated to the application of an extra 279 kg N ha -1 , so that the extra yield was produced at a 6 kg DM kg -1 N efficiency. This value was one third of that showed by the optimized treatment, which was 1.8 times more efficient in the use of N than the 450 kg N ha -1 treatment, on average. Results suggest that it is possible to adjust pasture's N fertilization considering soil N contribution via mineralization, and that this improves resources efficiency while maintaining pasture productivity.

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Section: Nuesupporting

confidence: 76%

Section: N Gapsupporting

confidence: 74%

“…This will contribute to increase fertilizer use efficiency from around 40% at present (Alfaro et al, 2009) to over 80% at the soil-plant interface.…”

Section: Nuementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Soil nitrogen contribution to grasslands and its implication for nitrogen use efficiency

Ortega

Alfaro

Martínez-Lagos

2016

J. Soil Sci. Plant Nutr.

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“…Adicionalmente, se incluyó una sexta categoría de concentración de P Bray excesiva que considera la posibilidad de pérdida de P por escurrimiento, y la eventual contaminación de cuerpos de agua (Alfaro et al, 2009;Zamuner, Lloveras y Echeverria, 2015).…”

Section: Materiales Y Métodosunclassified

Diagnóstico de requerimiento de fósforo para alfalfa (Medicago sativa L.) en argiudoles

Marino¹,

Echeverría²

2018

AgriS

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resumenSe planteó determinar el nivel crítico (NC) de P Bray en suelo y confeccionar guías de fertilización fosfatada para alfalfa en suelos Argiudoles. Se reanalizaron resultados de producción de materia seca (MS) y respuesta a P de cuatro años. Se evaluó la relación entre el rendimiento relativo (RR) de MS y P Bray con modelos logarítmico, cuadrático, lineal-plateau, cuadrático-plateau y arcoseno-logaritmo (ALCC modificado). El ALCC modificado cumplió el supuesto de homogeneidad de varianza y explicó el mayor porcentaje de variación entre el RR y el P Bray (R 2 = 0,87). La estimación del NC (18,1 mg kg -1, intervalo de confianza 15,8 y 20,1 mg kg -1 ) coincide con el determinado en otros ambientes. Se calibraron siete categorías de P Bray y se confeccionaron guías para la fertilización y refertilización según el criterio de suficiencia, y de reconstrucción y mantenimiento. Para 5 mg kg -1 de P Bray la dosis de superfosfato según el criterio de suficiencia fue de 118 kg ha -1 , para el criterio de reconstrucción y mantenimiento las dosis variaron de 160 a 248 kg ha -1 con producciones objetivo de 8 a 15 Mg MS ha -1 , respectivamente. Esta información permitirá un uso más racional de los fertilizantes en pasturas de alfalfa.Palabras clave: leguminosa forrajera, nutrición fosfatada, calibración del análisis de suelo, recomendación de fertilización.Marino, M. A. and Echeverría, H. E., 2018. Diagnosis of phosphorus requirement for alfalfa (Medicago sativa L.) in argiudols. Agriscientia 35: 11-24 summary The aim of this work was to determine the soil Bray P critical level (CL) and to develop phosphate fertilization guidelines for alfalfa in Argiudolls soils. Results from four years' dry matter production (DM) and P response were re-analyzed. The relationship between DM relative yield (RY) and Bray P was evaluated with logarithmic, quadratic, linear-plateau, quadratic-plateau and arcsine-logarithm models (modified ALCC). The modified ALCC model fulfilled the assumption of homogeneity of variance and explained the greater percentage of variation between RY and P Bray (R 2 = 0.87). The CL (18.1 mg kg -1 , confidence interval between 15.8 and 20.1 mg kg -1

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Effect of the Stocking Rate and Land Slope on Nitrogen Losses to Water on a Grazed Pasture of Southern Chile

Salazar¹,

Alfaro²,

Ledgard

et al. 2011

J. Soil Sci. Plant Nutr.

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Most of the studies on nitrogen (N) leaching have been carried out on cut grass, and there is a lack of information on beef grazed grasslands. The objective of this study was to quantify N runoff and leaching losses in beef production systems with two different immediate stocking rates (63 and 191 Holstein Friesian steers ha -1 day -1 ) and two land slopes (4 and 12%). Runoff and leachate samples were analyzed from 2004 to 2006 for total N, nitrate and ammonium. No significant differences for the total N losses were found between treatments (p > 0.05), which were low ranging from 0.9 to 26.8 kg N ha -1 yr -1 . The main pathway for the losses was leaching, which contributed >99% of the total N lost. The main form of N leaching was nitrate-N (>84%). Nitrate-N concentration in runoff samples was high, averaging 14 to 31 mg L -1 . We suggest that these low N losses could be related the low N fertiliser inputs in the pasture and to the N adsorption properties of volcanic soils and, so that further research is required on this subject.

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Nutrients Balances in Beef Cattle Production Systems and Their Implications for the Environment

Cited by 4 publications

References 20 publications

Soil nitrogen contribution to grasslands and its implication for nitrogen use efficiency

Soil nitrogen contribution to grasslands and its implication for nitrogen use efficiency

Diagnóstico de requerimiento de fósforo para alfalfa (Medicago sativa L.) en argiudoles

Effect of the Stocking Rate and Land Slope on Nitrogen Losses to Water on a Grazed Pasture of Southern Chile

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