Criteria for Decision Making and Economic Threshold Level for Wild Radish in Wheat Crop

TAVARES, L.C.; LEMES, E.S.; RUCHEL, Q.; WESTENDORFF, N.R.; AGOSTINETTO, D.

doi:10.1590/S0100-83582019370100004

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Article • Planta daninha 37 • 2019 • https://doi.org/10.1590/S0100-83582019370100004 copy

Criteria for Decision Making and Economic Threshold Level for Wild Radish in Wheat Crop

Critérios para Tomada de Decisão e Nível de Dano Econômico de Nabo na Cultura do Trigo

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT:

Weed competition limits wheat yield by reducing the availability of essential resources for its growth and development. In this sense, this study aimed to estimate the economic threshold level (ETL) of wild radish (Raphanus raphanistrum) in competition with wheat cultivars. Treatments were arranged in a factorial scheme. The factor wheat cultivar consisted of early (BRS 328), medium (BRS 177), and late (BRS Umbu) cycles and the factor wild radish population ranged from 0 to 564 plants m-2 (10 populations) for the cultivar BRS 328, 0 to 472 plants m-2 for the cultivar BRS 177 (11 populations), and 0 to 724 plants m-2 for the cultivar BRS Umbu (10 populations). The early-cycle BRS 328 presented a higher competitive ability when compared to the medium-cycle BRS 177 and late-cycle BRS Umbu. Yield losses of wheat grains due to wild radish interference can be satisfactorily estimated by the rectangular hyperbola model using the variables plant population, shoot dry matter, soil cover, and leaf area of the weed. ETL values varied as a function of the cultivar cycle, being higher for the cultivar BRS 328 (early) > BRS 177 (medium) > BRS Umbu (late). Wild radish is competitive in wheat crop, requiring at least 1.6 plants m-2 for control to be justified.

Keywords:
Triticum aestivum L.; Raphanus raphanistrum; cultivars; populations

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[1] *Corresponding author: <lizandro_cicilianotavares.com.br>

Cultivar	Cycle	Yield loss (%)⁽¹⁾	R²	F*	MSR
Plant population
BRS 328	Early	$(0.56 . X) [1 + (0.56 / 100) . X]$	0.86	158.93	980.7
BRS 177	Medium	$(2.60 . X) [1 + (2.60 / 100) . X]$	0.83	216.49	1289.0
BRS Umbu	Late	$(5.50 . X) [1 + (5.50 / 100) . X]$	0.96	825.18	429.3
Shoot dry matter
BRS 328	Early	$(0.15 . X) [1 + (0.15 / 100) . X]$	0.91	263.90	603.5
BRS 177	Medium	$(0.46 . X) [1 + (0.46 / 100) . X]$	0.94	581.32	493.7
BRS Umbu	Late	$(0.67 . X) [1 + (0.67 / 100) . X]$	0.93	416.95	840.8
Soil cover
BRS 328	Early	$(0.037 . X) [1 + (0.037 / 100) . X]$	0.78	103.06	1469.7
BRS 177	Medium	$(0.057 . X) [1 + (0.057 / 100) . X]$	0.86	261.18	1076.6
BRS Umbu	Late	$(0.071 . X) [1 + (0.071 / 100) . X]$	0.86	216.15	1590.7
Shoot leaf area
BRS 328	Early	$(0.0009 . X) [1 + (0.0009 / 100) . X]$	0.92	287.61	555.3
BRS 177	Medium	$(0.0030 . X) [1 + (0.0030 / 100) . X]$	0.92	480.35	595.4
BRS Umbu	Late	$(0.0045 . X) [1 + (0.0045 / 100) . X]$	0.92	385.70	907.4