Here comes the sunn: A comprehensive analysis of the cover crop sunn hemp (Crotalaria juncea L.) and its potential for seed production and weed control in Puerto Rican agricultural systems.

摘要

The cover crop Crotalaria juncea 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. juncea accessions in Puerto Rico. Studies were conducted from 2008-2009 to analyze the production and response to changes in photoperiod of 16 C. juncea accessions, as well as C. juncea 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 'Nigeria', 'Texas 374' and '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. juncea yields or weed suppression.