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Growth and Physiological Performance of Barley Plants Produced under Nitrogen Management
Crecimiento y rendimiento fisiológico de plantas de cebada producidas bajo manejo de nitrógeno
DOI:
https://doi.org/10.15446/ing.investig.v42n2.89116Keywords:
Cereal, Fertilizer, Hordeum vulgare. (en)Hordeum vulgare., Cereal, Fertilizante (es)
This work aimed to evaluate the effect of nitrogen dose management on the growth responses and physiological performance of barley seeds. Two barley cultivars (BRS Brau and BRS Cauê) and four nitrogen doses were used. The experimental design consisted of randomized blocks in a 2 X 4 factorial scheme (cultivars BRS Brau and BRS Cauê x nitrogen doses 120, 150, 180, and 210 kg ha-1). Successive collections of primary data were performed every fourteen days for growth analysis. The analyzed variables were total dry matter, dry matter production and relative growth rate, assimilated partition, and seed electrical conductivity. Increasing nitrogen doses caused a temporal-quantitative difference in growth, partition, and the accelerated aging test of barley seeds. The 150 kg ha-1 N dose resulted in total dry matter over time (Wt) superiority for both evaluated cultivars. The variable dry matter production rate achieved an increase with the 150 kg ha-1 N dose at 70 days after emergence (DAE) for BRS Brau and at 56 DAE for BRS Cauê supporting Wt. The 180 and 150 kg ha-1 N doses increased the relative growth rate for BRS Brau and BRS Cauê.
Este trabajo tuvo como objetivo evaluar el efecto del manejo de las dosis de nitrógeno en las respuestas de crecimiento y el rendimiento fisiológico de las semillas de cebada. Se utilizaron dos cultivares de cebada (BRS Brau and BRS Cauê) y cuatro dosis de nitrógeno. El diseño experimental consistió en bloques al azar en un esquema factorial 2 X 4 (cultivares BRS Brau y BRS Cauê x dosis de nitrógeno 120, 150, 180 y 210 kg ha-1). Se realizaron recolecciones sucesivas de datos primarios cada catorce días para el análisis de crecimiento. Las variables analizadas fueron materia seca total, producción de materia seca y tasa de crecimiento relativa, partición asimilada y conductividad eléctrica de las semillas. El aumento de las dosis de nitrógeno causa una diferencia cuantitativa-temporal en el crecimiento, partición y la prueba de envejecimiento acelerado de las semillas de cebada. La dosis de 150 kg ha-1 N resultó en una superioridad total de la materia seca en el tiempo (Wt) para ambos cultivares evaluados. La tasa variable de producción de materia seca logró un aumento para la dosis de 150 kg ha-1 N a los 70 días después de la germinación (DAE) para BRS Brau y a 56 DAE para BRS Cauê apoyando Wt. Las dosis de 180 y 150 kg ha-1 N aumentaron la tasa de crecimiento relativo para BRS Brau y BRS Cauê.
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Copyright (c) 2022 Bruno Oliveira Novais Araujo, Felipe Santos Zulli, Eduardo Gonçalvez Borges, Manoela Andrade Monteiro, Jessica Mengue Rolim, Letícia Barão Medeiros, Angelita Celente Martin, Tiago Pedó, Tiago Zanatta Aumonde
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