Yield Loss and Management of Volunteer Corn in Soybean

Abstract

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Bean yield loss in response to volunteer corn

“…Previous research also showed that volunteer corn growing in bean can be a highly competitive weed. Our results are consistent with those found by Alms et al (2016) that found i = 39.7, and Marquardt et al (2012b) observed i = 25, being these values obtained for the simultaneous emergence between volunteer corn and soybean. For dry bean, at each volunteer corn plant per square meter, the reduction on dry bean yield ranged from 6.5 at 19.3% (Sbatella et al, 2016).…”

“…The high losses of bean yield due to the increase of volunteer corn density, agree with found by Alms et al (2016), which verified a maximum yield loss in soybean of 71% for three plants m -2 of volunteer corn. The interference effects on bean yield from weeds is lower than volunteer corn, where the impact of high density of E. heterophylla (23 plants m²) reduce 54% of bean yield (Machado et al, 2015) and maximum losses for different bean cultivars ranging from 15.4 to 43.6% (density ranging from 0 to 50 plants m²) in competition with Bidens pilosa (Galon et al, 2016).…”

“…Common bean is an option for off-season cropping succession following corn, and this comprising a cultivated area of 284,000 hectares in southern Brazil (Conab, 2017). As a result of this succession, kernels or seeds corn are dropped in the field for mechanized harvesting can germinate following bean crop, becoming a volunteer plant problematic (Sbatella et al, 2016;Marquardt et al, 2012b;Alms et al, 2016).…”

“…Volunteer corn causes yields losses and contaminate seed in several crops, such as soybeans, corn, beet, dry edible bean, and cotton. The soybean grain contamination was 46% at 16 plants of corn m -2 (Marquardt et al, 2012b;Alms et al, 2016;Sbatella et al, 2016). Infestations can occur at high densities due to excessive losses of grains and kernels during harvest, which may reach 9% (Souza et al, 2006), thus kernels and grain of corn in contact with the soil will outcome volunteer corn on the following crop.…”

Weed Control in Soybean with Preemergence‐ and Postemergence‐applied Herbicides

“…Lower soybean yields were likely due to competition from grassy weed species, which were not well controlled by the POST‐applied‐only treatments (Table 5). Several studies have demonstrated the competitive potential of grasses to reduce soybean yields (Alms et al, 2016; Guglielmini et al, 2016; Hock et al, 2006; Vail and Oliver, 1993).…”