Response of Sweetpotato Cultivars to Linuron Rate and Application Time
| Autor: | Katherine M. Jennings, Jonathan R. Schultheis, Shawn C. Beam, Mathew Waldschmidt, Sushila Chaudhari, David W. Monks |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
0106 biological sciences
Chlorosis Crop injury 04 agricultural and veterinary sciences Plant Science Biology Ipomoea biology.organism_classification 01 natural sciences Application time Crop Horticulture 040103 agronomy & agriculture 0401 agriculture forestry and fisheries Transplanting Cultivar Agronomy and Crop Science After treatment 010606 plant biology & botany |
| Zdroj: | Weed Technology. 32:665-670 |
| ISSN: | 1550-2740 0890-037X |
| Popis: | Field studies were conducted in 2015 and 2016 in North Carolina to determine the response of ‘Covington’ and ‘Murasaki-29’ sweetpotato cultivars to four rates of linuron (420, 560, 840, and 1,120 g ai ha–1) alone or withS-metolachlor (803 g ai ha–1) applied 7 or 14 d after transplanting (DAP). Injury (chlorosis/necrosis and stunting) to both cultivars was greater when linuron was applied withS-metolachlor as compared to linuron applied alone. Herbicide application at 14 DAP caused greater injury (chlorosis/necrosis and stunting) to both cultivars than when applied at 7 DAP. At 4 wk after treatment (WAT), stunting of Covington and Murasaki-29 (hereafter Murasaki) from linuron at 420 to 1,120 g ha–1increased from 27% to 50% and 25% to 53%, respectively. At 7 or 8 WAT, crop stunting of 8% or less and 0% was observed in Covington and Murasaki, respectively, regardless of application rate and timing. Murasaki root yields were similar in the linuron alone or withS-metolachlor treatments, and were lower than the nontreated check. In 2016, no. 1 and marketable sweetpotato yields of Covington were similar for the nontreated check, linuron alone, or linuron plusS-metolachlor treatments, but not in 2015. Decreases in no. 1 and marketable root yields were observed when herbicides were applied 14 DAP compared to 7 DAP for Covington in 2015 and for Murasaki in both years. No. 1 and marketable yields of Covington were similar for 420 to 1,120 g ha–1linuron and nontreated check except marketable root yields in 2015. No. 1 and marketable sweetpotato yields of Murasaki decreased as application rates increased. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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