SNAP BEAN (PHASEOLUS VULGARIS L.) YIELD AND WEED CONTROL WITH SUNFLOWER (HELIANTHUS ANNUUS L.) RESIDUE

摘要

In the last years the per capita consumption of snap bean has been increased, which leads to the search for higher yields, than is possible to be obtained by means of the control of the abiotic and biotic factors that limit yield. The weed occurrencecan cause reductions in a 100% of the crop production by the competition of the ecological substrate (space, water, nutrients and light), in addition to being damaged by plagues and diseases (Carvalo and Torres, 1994). The weed control in snap bean generally is made by manual, mechanical and chemical form, being this last, fast and efficient. Nevertheless, the excessive use of agrochemical (Metobromuron) for its control can cause resistance of the weed to these products, environmental contamination andin some cases reduction in the growth and the yield pods (Park and Hamill, 1993; McNaughton et al., 2004). The weed control with products of vegetable origin has been set out, particularly with sunflower residues, that when degrading, they release allelopathic substances that inhibit the germination and weed growth (Rodriguez, 1994); in addition can be a source of organic matter to the soil. Thus, the aim of this study was to determine the effect of the soil incorporation of sunflower residues on weed control and yield in snap bean.