Publication Date
1997
Description
Five herbicide treatment regimes were applied to spring and fall seeded alfalfa from 1991 to 1995 at two locations, Klamath Falls and Powell Butte, Oregon. Treatments were evaluated by measuring alfalfa crown and weed stand counts, yield, weed content and forage quality of all cuttings each year. Weed control treatment did not affect hay yield at Klamath Falls. Severe weed competition in 1991 caused lower yields in untreated plots in 1992 at Powell Butte. Weed growth was most pronounced in the first cutting at both sites. The presence of weeds did not adversely affect forage quality in any cutting except the first cutting following planting. In all years second cutting hay did not meet dairy quality standards at either location. There were no significant differences in gross returns less herbicide expense in fall planted plots at Klamath Falls. Weed management strategy 2, which included herbicide treatment at establishment and none thereafter resulted in the highest gross returns less herbicide costs in both spring and fall established plots at Powell Butte.
Citation
Dovel, Randy and Bohle, Mylen, "Long Term Weed Management Effects in Alfalfa" (2024). IGC Proceedings (1993-2023). 74.
https://uknowledge.uky.edu/igc/1997/session22/74
Included in
Agricultural Science Commons, Agronomy and Crop Sciences Commons, Plant Biology Commons, Plant Pathology Commons, Soil Science Commons, Weed Science Commons
Long Term Weed Management Effects in Alfalfa
Five herbicide treatment regimes were applied to spring and fall seeded alfalfa from 1991 to 1995 at two locations, Klamath Falls and Powell Butte, Oregon. Treatments were evaluated by measuring alfalfa crown and weed stand counts, yield, weed content and forage quality of all cuttings each year. Weed control treatment did not affect hay yield at Klamath Falls. Severe weed competition in 1991 caused lower yields in untreated plots in 1992 at Powell Butte. Weed growth was most pronounced in the first cutting at both sites. The presence of weeds did not adversely affect forage quality in any cutting except the first cutting following planting. In all years second cutting hay did not meet dairy quality standards at either location. There were no significant differences in gross returns less herbicide expense in fall planted plots at Klamath Falls. Weed management strategy 2, which included herbicide treatment at establishment and none thereafter resulted in the highest gross returns less herbicide costs in both spring and fall established plots at Powell Butte.
