| Autor: |
King, T. A., Norsworthy, J. K., Woolard, M. C., Pritchett, S. L., Barber, L. T., Butts, T. R. |
| Předmět: |
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| Zdroj: |
B.R. Wells Rice Research Studies - Arkansas Agricultural Experiment Station, University of Arkansas System; Aug2023, Issue 696, p138-141, 4p |
| Abstrakt: |
Arkansas rice (Oryza sativa L.) producers face challenges when transitioning to a furrow-irrigated rice (FIR) system, which lacks a continual flood to prevent weed emergence. The lack of a continual flood allows Palmer amaranth [Amaranthus palmeri (S.) Wats.] emergence throughout most of the growing season and creates an environment conducive for growth. The presence of Palmer amaranth in a FIR system may result in reduced rice yields and a greater need for additional herbicide applications. A field trial was conducted at the Milo J. Shult Agricultural Research and Extension Center in Fayetteville, Ark., during the 2022 growing season to assess the impact of Palmer amaranth on FIR. Newly emerged Palmer amaranth plants were marked every 7 days, beginning 1 week prior to rice emergence through 4 weeks after rice emergence. Palmer amaranth biomass decreased by 1.5 oz, on average, every 7 days that the emergence of the weed was delayed relative to rice. At 2 weeks after rice emergence and beyond, most Palmer amaranth plants failed to survive until rice harvest. Averaged over emergence times, female plants weighed more than male plants, which resulted in greater interference with rice for limited resources. Female Palmer amaranth plants that emerged one week prior to the emergence of rice produced 270,000 seeds per plant while Palmer amaranth plants that emerged the week after rice produced 11,000 seeds per plant. Palmer amaranth plants that emerged 1 week prior to rice reduced rough rice yield by 60% at 6 inches from the weed. These results show that Palmer amaranth emergence timing is a critical factor influencing rough rice yield potential, Palmer amaranth seed production, and Palmer amaranth biomass. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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