The diversification of forage grasses is a strategic solution to obtain higher productivity in diverse environments. In this regard, the objective of the present study was to evaluate in a glasshouse study the flooding tolerance of 9 cultivars of forage grasses. The study was conducted using a complete randomized design with a 9 x 3 factorial arrangement: 9 cultivars (Brachiaria brizantha cvv. Marandu, Piatã e Xaraés; hybrid Brachiaria cv. Mulato II; B. humidicola cvv. Llanero and Tupi; B. ruziziensis cv. Common; Panicum maximum cvv. Massai and Tanzânia) and 3 soil water levels: a) minimal water for development (50% of field capacity); b) field capacity; and c) flooded soil (2 cm above soil level), with 3 replicates. Forage accumulation, plant height and root accumulation were evaluated. All cultivars grew well in soil at 50% field capacity highlighting their adaptation to mildly dry conditions. Under flooded conditions, B. humidicola cvv. Llanero and Tupi showed no reduction in forage dry matter production, while shoot growth of cvv. Marandu, Piatã, Tanzânia and Xaraés was significantly reduced (P<0.001) by 71.3, 94.0, 81.2 and 77.2%, respectively. Root mass was reduced about 30% in flooded plants relative to those grown at 50% field capacity. While all cultivars could be used where soil moisture is marginal for production, cvv. Llanero, Tupi and Massai would be most suitable where flooding could occur during the growing season. Field studies are needed to verify these glasshouse findings. ResumenLa diversificación de las gramíneas forrajeras es una solución estratégica para obtener una mayor productividad en ambientes diferentes. En condiciones de invernadero en la Universidad del Estado de Mato Grosso, Alta Floresta, Mato Grosso, Brasil, se realizó un estudio con el objetivo de evaluar la tolerancia de 9 cultivares de gramíneas forrajeras tropicales a condiciones de inundación controlada. Los tratamientos se dispusieron en un diseño completamente al azar con arreglo factorial 9 x 3: nueve cultivares (Brachiaria brizantha cvs. Marandu, Piatã y Xaraés; Brachiaria híbrido cv. Mulato II; B. humidicola cvs. Llanero y Tupi; B. ruziziensis cv. Común; y Panicum maximum cvs. Massai y Tanzânia) y 3 niveles de agua en el suelo: a) cantidad de agua considerada como mínima para el crecimiento de las plantas (50% de capacidad de campo); b) suelo a capacidad de campo; y c) suelo inundado con una lámina de 2 cm sobre el nivel del suelo, con 3 repeticiones. Como parámetros se midieron la producción de forraje, la altura de planta y la acumulación de raíces. Todos los cultivares presentaron buen desarrollo cuando el suelo se encontraba a 50% de capacidad de campo, lo cual muestra su adaptación a condiciones ligeramente secas. Bajo condiciones de inundación, B. humidicola cvs. Llanero y Tupi no mostraron reducción en la producción de materia seca de forraje, mientras que el crecimiento de los cvs. Marandu, Piatã, Tanzânia y Xaraés se redujo significativamente (P<0.001) en 71.3, 94.0, 81.2 y 77.2%, respectivamente. En pl...
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