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

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.

Competição entre híbridos de milho com plantas daninhas

“…Frandaloso et al (2019) também observaram que o efeito da competição interespecíficas foi mais prejudicial do que a intraespefica ao trabalharem com milho na presença do e21101 SAS, 2(1):e21101, 2021 papuã. Zanine; Santos, (2004) descrevem que a redução no crescimento de espécies, envolvidas em combinações intra ou interespecíficas, resulta da competição espacial entre grupos de plantas que ocupam o mesmo espaço.Outros trabalhos envolvendo diferentes espécies de plantas em competição também denotaram efeitos similares aos constatados no presente estudo, como trigo na presença de nabo(TAVARES et al, 2019), arroz em competição com capim-arroz(GALON;AGOSTINETTO, 2009), arroz e soja x milhã(AGOSTINETTO et al, 2013), trigo x nabo (COSTA; RIZZARDI, 2015) e soja x plantas daninhas(FORTE et al, 2017).…”

Population Distribution of Wild Radish (Raphanus Raphanistrum L.) Weed and Soil Depth of Seed Bank Across Different Land-Use Types in Horro District, Western Oromia, Ethiopia

“…In the Horro district especially the study area, wild radish was introduced for a long list of about more than 30 years because it is obvious, the seed dormancy assists the survival of plants in several ways; including ensuring the persistence of species in risky environments, enabling germination to agree with the season most favorable for plant growth and interacting with other life cycle traits in helping the plant to maintain itself [33], and it is the most persisted weed species in this area in various land use types because it is one of the most problematic and competitive [25,2,9] reports. Plant attributes particularly important to weeds include adaptations for effective seed dispersal, seed dormancy, long-lived seed bank, rapid growth, and phenotypic plasticity [4].…”

Influence of intra‐row cruciferous surrogate weed growth on crop yield in organic spring cereals

“…Notably, the articles referred to in this paragraph describe the impact of weeds occurring across both the intra‐ and inter‐row zones. Corresponding to the i ‐parameter in Equation (), as the density of natural weed, R. raphanistrum, increases by one plant per square meter, spring wheat yields are reduced by 0.51% to 5.50% (Eslami et al, 2006; Tavares et al, 2019). In the present study, yield effects resulting from increasing intra‐row surrogate weed density is comparable to R.raphanistrum ; S. alba reduced spring wheat yield by 0.83% to 4.63% (Table 4).…”