The value of using mimic weeds in competition experiments in irrigated cotton

Charles Graham W.; Sindel Brian M.; Cowie Annette L.Knox Oliver G. G.

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The value of using mimic weeds in competition experiments in irrigated cotton

机译：The value of using mimic weeds in competition experiments in irrigated cotton

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Crop plants have been used as mimic weeds to substitute for real weeds in competition studies. These mimic weeds have the advantages of availability of seed, uniform germination and growth, and the potential to confer better experimental controllability and repeatability. However, the underlying assumption that the competitive effects of mimic weeds are similar to real weeds has not been tested. We compared a range of morphological traits (plant height, node and leaf number, leaf area, leaf size, and dry weight) between the mimic weeds and real weeds: Japanese millet vs. junglerice, mungbean vs. bladder ketmia, and common sunflower vs. fierce thornapple. The impact of these mimic and real weeds on cotton was also assessed. There were similarities and differences between the mimic and real weeds, but impact on cotton lint yield was most closely associated with weed height and dry weight at mid-season. Mimic weeds may be satisfactorily substituted for real weeds in competition experiments where seasonal and environmental conditions are not limiting, such as with fully irrigated cotton, provided the plants have similar dry weight and height at mid-season. Alternatively, one can account for the differences in dry weight and height. We define here a generalized relationship estimating the yield loss of high-yielding, irrigated cotton from weed competition over a range of weed dry weights and heights, allowing extrapolation from the results with mimic weeds to the competitive effects of a range of weeds.

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《Weed Technology: A journal of the Weed Science Society of America》 |2019年第4期|601-609|共9页
作者
Charles Graham W.; Sindel Brian M.; Cowie Annette L.Knox Oliver G. G.;
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作者单位

Australian Cotton Res Inst, New South Wales Dept Primary Ind, Locked Bag 1000, Narrabri, NSW 2390, Australia;

Univ New England, Sch Environm & Rural Sci, Weed Sci, Armidale, NSW 2351, Australia;

Univ New England, Beef Ind Ctr, New South Wales Dept Primary Ind, Armidale, NSW 2351, AustraliaUniv New England, Sch Environm & Rural Sci, Armidale, NSW 2351, Australia;

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正文语种英语
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Lawrence E; Steckel; University of Tennessee; Bladder ketmia; Hibiscus tridactylites Lindl; common sunflower; Helianthus annuus L; cotton; Gossypium hirsutum L; fierce thornapple; Datura ferox L; Japanese millet; Echinochloa esculenta (A; Braun) H; Scholz; junglerice; Echinochloa colona (L; ) Link; mungbean; Vigna radiata (L; ) R; Wilczek; dry weight; leaf area; lint yield; plant height; morphology; model weeds;

The value of using mimic weeds in competition experiments in irrigated cotton

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