Vegetable crop sensitivity to mesotrione soil residues

摘要

The objective of this research was to identify the potential for injury and yield reductions to vegetable crops grown in rotation with corn, following mesotrione application to corn. Mesotrione was applied pre-emergence to corn after planting in the spring of 2002 at 175 g a.i./ha and 350 g a.i./ha, and post-emergence at the 5-leaf stage of corn at 100 g a.i./ha and 200 g a.i./ha (Site 1). In the spring of 2003, tomato, potato and green beans were planted into the same site followed by peas, black beans and green beans in the spring of 2004. Mesotrione was also applied pre-emergence to corn in the spring of 2003 at 175 g/ha and 350 g/ha (Site 2). In the spring of 2004, broccoli, onion, carrot, pepper and cucumber were planted into this site. All experiments were arranged in a randomized complete block design, with a control plot and four replications. Injury ratings and final yield of each crop were recorded. Only green beans showed significant injury in 2003 at Site 1 at 350 g/ha, and this resulted in a significant yield reduction but no injury or yield reductions were observed in 2004, two years after mesotrione application. At Site 2 in 2004, one year after mesotrione application, onion, carrot and cucumber showed significant injury at 350 g/ha, but only carrot showed significant yield reductions. Broccoli and pepper were not affected.