Interference and threshold level of Sida rhombifolia on Chenopodium quinoa Willd. crop




Arrowleaf sida, competitive ability, interaction between plants, quinoa


Studies on interference and economic threshold level (TL) of weeds on quinoa are scarce. Thus, the goal of this study is to determine the interference and the TL of Sida rhombifolia (arrowleaf sida) on quinoa varieties. The experiment was organized using a completely randomized design, with four replicates. The treatments were composed of quinoa varieties (Q 1303, Q 1331 and Q 1324) in competition, respectively, with ten densities of arrowleaf sida (0, 12, 16, 18, 128, 252, 432, 524, 584, and 756; 0, 24, 88, 104, 112, 124, 160, 164, 260 and 320; 0, 16, 72, 104, 116, 144, 156, 160, 228 and 304 plants m-2). The variables evaluated were: plant density, soil coverage, leaf area, dry mass of weed shoots; and the variables related to quinoa were: grain yield, control cost, price per bag and control efficiency. Quinoa variety Q 1303 showed greater competitive ability with arrowleaf sida than Q 1331 and Q 1324. The values of TL varied from 1.79 to 11.60 plants m-2 for the Q 1303 variety, which demonstrated higher competitiveness with arrowleaf sida, while the lowest TL values varied from 0.80 to 6.91 plants m-2 for Q 1234 and Q 1331 varieties, showing less competitiveness in presence of the competitor. The TL values decreased with the increases in grain yield, in the price of the quinoa bag, in the efficiency of weeding and in the reduction of the control cost of arrowleaf sida, justifying the adoption of weed control measures.


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Agostinetto, D., L. Galon, J.M.B. Silva, S.P. Tironi, and A. Andres. 2010. Interference and economic weed threshold (Ewt) of barnyardgrass on rice as a function of crop plant arrangement. Planta Daninha 28: 993-1003.

Brandler, D., L. Galon, A.J. Mossi, T.P. Pilla, R.J. Tonin, C.T. Forte. et al. 2021. Interference and level of economic damage of turnip in canola. Revista Agraria Academica 4 (1): 39-56.

Brunetto, L., L. Galon, D.C. Cavaletti, J.D Munaretto, A. Castamann, and G.F. Perin. 2023. Competitive response and level of economic damage of quinoa in the presence of alexandergrass. Revista Brasileira de Ciências Agrárias 18(1): 1-9.

Cargnelutti-Filho, A., and L. Storck L. 2007. Evaluation statistisc of the experimental precision in corn cultivar trials. Pesquisa Agropecuária Brasileira 42(1): 17-24.

CEMETRS (Estadual Meteorology Center). 2012. (retrieved on January 4, 2023).

Cousens, R. 1985. An empirical model relating crop yield to weed and crop density and a statistical comparison with other models. The Journal of Agricultural Science 105(3): 513-521.

Cousens, R. 1991. Aspects of the design and interpretation of competition (interference) experiments. Weed Technology 5(3): 664-673.

Cunha, V.C., J.B. Santos, E.A. Ferreira, C.M. Cabral, D.V. Silva, and E.M. Gandini. 2012. Comparative leaf anatomy of guanxuma species. Planta Daninha 30(2): 341-349.

Galon, L., C.T. Forte, R. L. Gabiatti, L.L. Radunz, I. Aspiazú, R. Kujawinski et al. 2016. Interference and economic threshold level for control of beggartick on bean cultivars. Planta Daninha 34(3): 411-422.

Galon, L., C.T. Forte, R.L. Gabiatti., L.L. Radunz, I. Aspiazú, and R. Kujawinski. 2019. Competitive interaction and economic injury level of Urochloa plantaginea in corn hybrids. Arquivos do Instituto Biológico 86 (e0182019): 1-9.

Galon, L., A. Konzen, M.A.M. Bagnara, L. Brunetto, I. Aspiazú, A.M.L. Silva et al. 2022. Interference and threshold level of Sida rhombifolia in transgenic soybean cultivars. Revista de la Facultad de Ciencias Agrarias – UNCuyo 54(2): 94-106.

García-Parra, M., A. Zurita-Silva, R. Stechauner-Rohringer, D. Roa-Acosta, and S.E. Jacobsen. 2020. Quinoa (Chenopodium quinoa Willd.) and its relationship with agroclimatic characteristics: A Colombian perspective. Chilean Journal of Agricultural Research 80(2): 290-302.

Jha, P., V. Kumar, R.K. Godara, and B.S. Chauhan. 2017. Weed management using crop competition in the United States: A review. Crop Protection 95(1): 31-37.

Kalsing, A., and R.A. Vidal. 2013. Critical density of alexander grass in common bean. Planta Daninha 31(4): 843-50.

Khatounian, C.A., T. Passini, L.A.O. Penha, and D.A.M. Oliveira. 2016. Seed production of Urochloa plantaginea (Link) R. Webster infesting maize and in pure stands. Revista Brasileira de Agroecologia 11(4): 281-286.

Laub, M., L. Pataczek, A. Feuerbacher, S. Zikeli, and P. Högy. 2022. Contrasting yield responses at varying levels of shade suggest different suitability of crops for dual land-use systems: a meta-analysis. Agronomy for Sustainable Development 42 (51): 1-13.

Lindquist, J.L., and M.J. Kropff. 1996. Applications of an ecophysiological model for irrigated rice (Oryza sativa)-Echinochloa competition. Weed Science 44(1): 52-56.

Minh, N.V., and T.V. Nguyen. 2021. Assessment of yield and quality of quinoa accessions grown in Ferralsols following seasonal difference. Australian Journal of Crop Science 15(12): 1485-1491.

Qin, X.S., Z.G. Luoand, and X.C. Peng. 2018. Fabrication and characterization of quinoa protein nanoparticle-stabilized food-grade pickering emulsions with ultrasound treatment: interfacial adsorption/arrangement properties. Journal of Agricultural and Food Chemistry 66(17): 4449-4457.

Silva, P.S.L., P.I.B. Silva, K.M.B. Silva, Oliveira, V.R., and F.S.T. Pontes Filho. 2011. Corn growth and yield in competition with weeds. Planta Daninha 29(4): 793-802.

Spehar, C.R., J.E.S. Rocha, and L.R.B. Santos. 2011. Agronomic performance and recommendations for quinoa (BRS Syetetuba) crop in the brazilian savannah. Pesquisa Agropecuária Tropical 41(1): 145-147.

Sun, C., M. Ashworth, K. Flower, M. Vila-Aiub, R. Rocha, and H. Beckie. 2021. The adaptive value of flowering time in wild radish (Raphanus raphanistrum). Weed Science 69 (2): 203-209.

Tavares, L.C., E.S. Lemes, Q. Ruchel, N.R. Westendorff, and D. Agostinetto. 2019. Criteria for decision making and economic threshold level for wild radish in wheat crop. Planta Daninha 37: e019178898.

USDA (US Department of Agriculture). 2022. (retrieved Octuber 22, 2022).

Velásquez-Barreto, F.F., E.E. Ramirez-Tixe, M.D. Salazar-Irrazabal, and E. Salazar-Silvestre. 2020. Physicochemical properties and acceptability of three formulations containing fava bean, quinoa and corn flour extrudates. Revista de Ciencias Agrícolas 37(2): 40-48.



How to Cite

Galon, L., Cavaletti, D. C., Brunetto, L., Munareto, J. D., Aspiazu, I., & Castamann, A. (2024). Interference and threshold level of Sida rhombifolia on Chenopodium quinoa Willd. crop. Bioagro, 36(1), 3-14.