Fabrícia Costa Adriano
Abstract:
The Crotalaria juncea, C. spectabilis e C. ochroleuca are natural fertilizers that can control the population of nematodes in soil, it being used I consortium or succession by farmers of Brazilian Midwest. As there are no registered products for this crop and the information about the selectivity in these species are meager. Weed control has become an obstacle for the farmers. Thereby, the aim of this study was to investigate which herbicides show selectivity for C. juncea, C. spectabilis and C. ochroleuca. The study was conducted in pots in open field, at the Experimental Farm of the Federal University of Goias – Jataí Regional. It was in a fully delineated in factorial schemes with 5 replicates in 2 experiments.In the first experiment it was established the factorial scheme of 6X3, the first factor was composed of 5 herbicides (glyphosate + carfentrazone-ethyl, glyphosate + parquet, glyphosate + diclosulam, glyphosate + s metolachlor, glyphosate), more to the check (without herbicides) and the second factor for 3 species of crotalaria (C. juncea, C. spectabilis and C. ochroleuca). The second experiment it was in scheme of 7X3, whereupon it was 6 herbicides (glyphosate + sulfentrazone, glyphosate + clomazone + carfentrazone-ethyl, glyphosate + 2,4-D, glyphosate + chlorimuron-ethyl, glyphosate + flumioxazin, glyphosate), more to the check (without herbicides) and the second factor for 3 species of crotalaria (C. juncea, C spectabilis and C ochroleuca). In both experiments it was simulated the application in the system of planting, being evaluated, the rate of emergency speed; the percentage of emerged plants; the height of plants; the dry mass of the aerial part and the root system. It was verified that the 3 species of crotalaria evaluated showed different behaviors for the same herbicide treatment. The glyphosate + diclosulam e o glyphosate +s-metolachlor were not selective for the specie C. ochroleuca. The glyphosate + flumioxazin were not shown to be selective for the 3 species of crotalaria under study.
