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Here comes the Sunn: A comprehensive analysis of the cover crop sunn hemp (𝘊𝘳𝘰𝘡𝘒𝘭𝘒𝘳π˜ͺ𝘒 𝘫𝘢𝘯𝘀𝘦𝘒 L.) and its potential for seed production and weed control in Puerto Rican agricultural systems

Chan Halbrendt, Jacqueline
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Abstract
The cover crop 𝘊𝘳𝘰𝘡𝘒𝘭𝘒𝘳π˜ͺ𝘒 𝘫𝘢𝘯𝘀𝘦𝘒 L. has been recognized for its high biomass production, nitrogen-fixation, and allelopathic properties. However, extensive studies have not been conducted to assess the behavior of different 𝘊. 𝘫𝘢𝘯𝘀𝘦𝘒 accessions in Puerto Rico. Studies were conducted from 2008-2009 to analyze the production and response to changes in photoperiod of 16 𝘊. 𝘫𝘢𝘯𝘀𝘦𝘒 accessions, as well as 𝘊. 𝘫𝘢𝘯𝘀𝘦𝘒 performance under different planting densities (10, 25 and 40 lb/ac) and apical treatments (no cutting, cutting at 3, 4, and 5 weeks after planting) with respect to their potential for production of biomass, seed, and weed suppression. Results showed that despite photoperiod changes, the accessions β€˜Nigeria’, β€˜Texas 374’ and β€˜T’ai-yang-ma’ have potential for biomass and/or seed production in Puerto Rico. Additionally, the highest biomass and seed yields were obtained with a planting density of 25 lb/ac, and apical cuttings did not improve 𝘊. 𝘫𝘢𝘯𝘀𝘦𝘒 yields or weed suppression.
La cobertura 𝘊𝘳𝘰𝘡𝘒𝘭𝘒𝘳π˜ͺ𝘒 𝘫𝘢𝘯𝘀𝘦𝘒 L. es reconocida por su alta producciΓ³n de biomasa, fijaciΓ³n de nitrΓ³geno y propiedades alelopΓ‘ticas. Sin embargo, no se han realizado investigaciones extensas para evaluar el comportamiento de accesiones de 𝘊. 𝘫𝘢𝘯𝘀𝘦𝘒 en Puerto Rico. Se realizaron investigaciones en Lajas, Puerto Rico, durante 2008-2009 para analizar la respuesta a los cambios en fotoperΓ­odo de 16 accesiones de 𝘊. 𝘫𝘢𝘯𝘀𝘦𝘒, y el efecto de densidades de siembra (10, 25 y 40 lb/ac) y cortes apicales (no cortes, cortes a las 3, 4, y 5 semanas despuΓ©s de la siembra) en la producciΓ³n de biomasa y semilla, asΓ­ como la supresiΓ³n de malezas. Los resultados muestran que en diferentes fotoperΓ­odos las accesiones β€˜Nigeria’, β€˜Texas 374’ y β€˜T’ai- yang-ma’ presentan potencial para producciΓ³n de biomasa y/o semilla en Puerto Rico. En adiciΓ³n, la mayor producciΓ³n de biomasa y semilla se obtuvo con la densidad de siembra de 25 lb/ac. Los cortes apicales no mejoraron la productividad de 𝘊. 𝘫𝘢𝘯𝘀𝘦𝘒 ni su capacidad para suprimir malezas.
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Date
2010
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Research Projects
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Keywords
Crotalaria juncea L., Nitrogen-fixation, Allelopathic properties, Density, Densidad
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