1. Optimum Cereal Rye Termination Timing in Corn.
- Author
-
Carvalho-Moore, P., Norsworthy, J. K., Woolard, M. C., Piveta, L. B., Avent, T. H., Noe, S., and Barber, L. T.
- Subjects
COVER crops ,CORN ,RYE ,SOYBEAN ,YELLOW nutsedge ,ATRAZINE - Abstract
Cereal rye (Secale cereale L.) is one of the most used cover crops for soybean [Glycine max (L.) Merr.] production across the United States. Its use is limited in corn (Zea mays L.), and data regarding the best timing to terminate cereal rye to avoid negative affects to the crop are scarce. Therefore, the objective of this study was to determine the most appropriate cereal rye termination timing in corn. Treatments consisted of cereal rye terminated at 21, 14, and 7 days prior to or after planting and at planting. A conventional tillage treatment with no cover crop was also included. The cover crop in all treatments was terminated by applying glyphosate plus S-metolachlor plus atrazine. These herbicides were also sprayed at planting in the conventional tillage treatment. At 30 days after planting, corn stand count in two 40-in. row sections, the height of five plants per treatment, and yellow nutsedge (Cyperus esculentus L.) suppression were collected. The highest yellow nutsedge suppression was observed in the treatment where there was conventional till (77%) and when the cover crop was terminated 7 days after planting the corn (63%). Corn stand was not different among the treatments. Additionally, corn plants from the treatment with cereal rye terminated 7 days after planting corn had an average height of 27 in., significantly higher than the other termination timings. The lowest heights were observed in the treatment with cereal rye terminated 21 days after planting with an average of 19 in. Based on these initial findings, cereal rye should be terminated 7 days before or after corn planting to avoid negative growth interference that may cause delay or reduction in yield without losing its desired weed suppression capacity. This study will be repeated and data from additional years will be used to support further or refute these preliminary findings. [ABSTRACT FROM AUTHOR]
- Published
- 2023