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Incident photosynthetically active radiation as a basis for integrated management of purple nutsedge (Cyperus rotundus)

Published online by Cambridge University Press:  12 June 2017

Christophe Neeser ,
Renan Aguero  and
Clarence J. Swanton
Christophe Neeser
Affiliation:
Crop Science, University of Guelph, Guelph, ON, Canada N1G 2W1
Renan Aguero
Affiliation:
Plant Sciences, University of Costa Rica, San Jose, Costa Rica
Clarence J. Swanton
Affiliation:
Crop Science, University of Guelph, Guelph, ON, Canada N1G 2W1
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Abstract

Artificial shading studies indicated that competition for photosynthetically active radiation (PAR) will limit tuber production in purple nutsedge. There were no data available to test whether there is a relationship between incident PAR underneath crop canopies and tuber production of this weed. In this study, the effect of crop competition on net reproductive rates of purple nutsedge tubers was measured under field conditions. Purple nutsedge plants were grown in association with bush beans, maize, maize and beans intercropped, sweet potato, pole beans, and bell pepper in a 2-yr field study in Costa Rica. Measurements were taken on the number of tubers produced during the growing season of each crop, and PAR transmittance was monitored weekly for the duration of the respective cropping cycles. Data on transmittance and incident solar radiation were used to calculate the daily average amount of PAR, available 15 cm above the soil surface. Regressions indicated that average incident PAR accounted for 95% of the variation in net reproductive rates. Average incident PAR also allowed a more precise competitive ranking of crops than either average or minimum transmittance. Bush beans had consistently the lowest average incident PAR values and therefore ranked as the most competitive crop in both years. Our data suggest that no net increase in tuber populations occurs if average incident PAR is below 2.7 MJ m−2 d−1. Differences in the duration of the cropping cycle accounted only for a small proportion of the overall variation in net reproductive rates of purple nutsedge tubers. Information on the competitive ranking of different crops can be used to design crop rotations that could reduce reliance on herbicides on small farms in Costa Rica.

Keywords

Purple nutsedge, Cyperus rotundus L.maize = corn, Zea mays L. ‘Diamantes 843’bush beans, Phaseolus vulgaris L. ‘Dor 390’pole beans, Phaseolus vulgaris L. ‘Brunca’sweet potato, Ipomoea batatas (L.) Lam. ‘C-97’bell pepper, Capiscum annum L.Tubernet reproductive ratetransmittancepopulation dynamicsCYPRO
Type
Weed Biology and Ecology
Information
Weed Science , Volume 45 , Issue 6 , December 1997 , pp. 777 - 783
Copyright
Copyright © 1997 by the Weed Science Society of America 

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