Tall Waterhemp Competition in Grain Sorghum

Abstract

Grain sorghum (Sorghum vulgare Pers.) was grown in combination with varying densities and durations of tall waterhemp (Acnida altissima Riddell) during 1964 and 1965 at Manhattan, Kansas. As waterhemp density and duration increased, sorghum fodder and grain yields were reduced. Yields of both species and competitive influence of waterhemp were highest during the year of high rainfall and supplemental N fertility. The net competitive influence of waterhemp on sorghum grain was accounted for principally by reduced seed size. Competition for soil moisture in 1965 was greatest when weeds remained full-season, and was most pronounced early in the season at soil depths below 20 inches.

Assessment of Sorghum (Sorghum bicolor L.) Productivity under Different Weed Control Methods, Mineral and Nano Fertilization

“…The increase in yield and its component of the sorghum plant may be due to the effect of one hoeing plus herbicide. Treatment or herbicide treatment on reducing the number of weeds/m 2 dry weight of weed/m2 and weed plant the eight as shown in Table (3).These results are in the same trend with those obtained by Feltner et al (1996);Baldev Ram et al (2004); Kandil and Kordy (2013); Srinivasaperumal and Kalisudarson (2019) they recorded the role of hoeing and herbicides for reducing the spread of weeds.…”

“…The many investigators such as Feltner et al (1996) and Burnside et al (1967); Smith et al (1990); Kandil and Kordy (2013); Srinivasaperumal and Kalisudarson (2019) explained the weed competition with crops for light, CO2, water, and nutrients that may reduce yield and its components.…”

“…Weed could be controlled in crops through cultural, mechanical and chemical methods, the wise use of these individual methods or a combination of them can manage weed effectively without causing economic loss or harming the environment (Magain, 2008).Weed control in grain sorghum is a challenge because of the limited number of herbicides available to growers, rotational crop restrictions following a number of herbicides registered for use in sorghum grain, and because of the increased presence of herbicide-resistant weeds. Competition from broadleaf weeds decreased grain yield of sorghum more than grass species competition or mixtures of broadleaf and grass weeds (Feltner et al, 1996).Weed competition the first two weeks after plant emergence has not decreased grain sorghum yields regardless of the weeds studied (Burnside and Wicks., 1967). Period of weed growth beyond two weeks after grain sorghum emergence decreased yields reliant on the weed species and environmental conditions (Smith et al, 1990).…”

Resistance to HPPD‐inhibiting herbicides in a population of waterhemp (Amaranthus tuberculatus) from Illinois, United States

“…)3 and grain sorghum [ Sorghum bicolor (L.) Mönch.] 4. Waterhemp infestations in Illinois agronomic crops have become common during the last two decades,5 attributable to changes in cropping practices, differential susceptibility to herbicides and evolution of herbicide‐resistant biotypes.…”

Grain Sorghum Tolerance and Weed Control with Pyrasulfotole plus Bromoxynil Combinations

“…Yield reductions primarily were due to the reduced seed and panicle size (5,22). However, it was reported in some situations that grain sorghum seed weight or the number of panicles per plant were reduced (8,26).…”