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Growth of Purple Nutsedge (Cyperus rotundus) in Response to Interference with Direct-Seeded Rice

  • Bhagirath S. Chauhan (a1) and Jhoana Opeña (a1)

Abstract

The biology of purple nutsedge was studied by growing it alone and in competition with 12 and 24 rice plants in a pot experiment. Compared with the weedy plants grown alone, competition from rice reduced purple nutsedge leaf number, shoot number, tuber production rate, and leaf biomass. At 10 wk after planting, interference from 12 and 24 rice plants reduced purple nutsedge leaf area by 79 and 86%, respectively, compared with weedy plants grown without rice interference. On the same date, purple nutsedge aboveground shoot biomass was 26.8 g plant−1 without interference, whereas in interference with 12 and 24 rice plants, purple nutsedge produced aboveground biomass of 4.8 and 2.2 g plant−1, respectively. A total of 95 tubers plant−1 were produced by purple nutsedge when grown alone. Growth with 12 and 24 rice plants reduced tuber production to 33 and 17 tubers plant−1, respectively. Without interference, purple nutsedge produced 40 g plant−1 of total biomass of tuber plus root plus rhizome, whereas in interference with 12 and 24 rice plants, purple nutsedge produced 14 and 5 g plant−1 of total belowground biomass, respectively.

La biología de Cyperus rotundus fue estudiada sembrando plantas solas y en competencia con 12 y 24 plantas de arroz en un experimento en macetas. Comparada con malezas sembradas solas, la competencia debido al arroz redujo el número de hojas y brotes de C. rotundus, así como la tasa de producción de tubérculos y la biomasa de la hoja. A las 10 semanas después de la siembra, la interferencia de 12 y 24 plantas de arroz redujo el área de la hoja de C. rotundus en 79 y 86%, respectivamente, comparada con plantas sin la interferencia del arroz. En la misma fecha, la biomasa aérea de los brotes de C. rotundus fue de 26.8 g planta−1 sin interferencia, mientras que con interferencia de 12 y 24 plantas de arroz, C. rotundus produjo una biomasa aérea de 4.8 y 2.2 g planta−1, respectivamente. Un total de 95 tubérculos planta−1 se produjeron cuando C. rotundus se sembró sin competencia. La siembra con 12 y 24 plantas de arroz redujo la producción de tubérculos a 33 y 17 planta−1, respectivamente. Sin interferencia, esta maleza produjo 40 g planta−1 de biomasa total del tubérculo más raíz más rizoma, mientras que con interferencia de 12 y 24 plantas de arroz, C. rotundus produjo 14 y 5 g planta−1 de biomasa total de tejido subterráneo, respectivamente.

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Corresponding author

Corresponding author's E-mail: b.chauhan@irri.org

References

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Growth of Purple Nutsedge (Cyperus rotundus) in Response to Interference with Direct-Seeded Rice

  • Bhagirath S. Chauhan (a1) and Jhoana Opeña (a1)

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