Effects of competition with weeds on the growth, development and yield of sorghum

Everaarts, A.P.

doi:10.1017/s0021859600074220

Cited by 22 publications

(16 citation statements)

References 19 publications

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“…Although weeds were removed with handweeding, the timing of removal may have led to weed competition in the plants (Everaarts, 1992;Van Heemst, 1985). Net income (fruit harvest minus weed management costs over the 3 years), not including other management costs which were assumed to be equivalent among weed management treatments, was $31,380/ha in the weed mat, 86% and 20% greater than in the non-weeded and handweeded systems, respectively.…”

Section: Resultsmentioning

confidence: 99%

Weed Management Practices for Organic Production of Trailing Blackberry: I. Plant Growth and Early Fruit Production

Harkins¹,

Strik²,

Bryla³

2013

horts

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Weed management practices were evaluated in a new field of trailing blackberry (Rubus L. subgenus Rubus Watson) established in western Oregon. The field was planted in May 2010 and certified organic in May 2012. Treatments included two cultivars, Marion and Black Diamond, grown in 1) non-weeded plots, where weeds were cut to the ground just before harvest; 2) hand-weeded plots, hoed two to three times per year; and 3) weed mat plots, covered with black landscape fabric. Each treatment was fertilized with fish emulsion and irrigated by drip. Weeds increased from 2010 through 2012 in both non-weeded and hand-weeded plots and required 38 and 90 h·ha−1 of labor to remove the weeds in the latter treatment in 2011 and 2012, respectively. Weeds in weed mat plots, in comparison, were confined primarily to the planting holes in the fabric and required only 1 h·ha−1 of labor for weed removal each year. Blackberry growth, in terms of number and dry weight of the primocanes, was similar among treatments during the first year after planting but differed with cultivar and weed management the next season. In 2011, ‘Black Diamond’ produced shorter but an average of three more primocanes per plant than ‘Marion’, whereas plants in hand-weeded and weed mat plots produced nearly twice as many primocanes as non-weeded plots. Hence, when fruit were produced on floricanes (the previous year’s primocanes) for the first time in 2012, ‘Black Diamond’ had 15% more yield than ‘Marion’, and weed control increased yield by 67% with hand-weeding and 100% with weed mat, on average. ‘Black Diamond’ and weed control also produced larger berries (measured as average individual fruit weight) with a greater water content but a lower soluble solids concentration. So far, of the three practices studied, weed mat was best suited to organic production of blackberries. The initial cost of the weed mat was far less than the cost of hand-weeding during the first 3 years after planting, and after only one season of fruit production, the yield benefit of weed mat provided enough profit to warrant its use over no weeding or hand-weeding.

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Section: Resultsmentioning

confidence: 99%

Weed Management Practices for Organic Production of Trailing Blackberry: I. Plant Growth and Early Fruit Production

Harkins¹,

Strik²,

Bryla³

2013

horts

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“…It is well established that the most critical period for cropweed competition in sorghum is 45 DAS. At initial stages, the sorghum grows slowly and is a weak competitor to most weeds; even minimal weed infestations in the early growth period reduce sorghum yields significantly (Everaarts 2003).…”

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confidence: 99%

Weed management influence on crop-weed competition in sorghum under South Gujarat conditions

Deshmukh¹,

Usadadia²

2017

Ind. Jour. Weed Scie.

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A field experiment was conducted at Instructional Farm, Navsari Agricultural University, Navsari during 2013-14 and 2014-15 with a view to study the crop-weed competition as influenced by different weed management practices in Rabi (winter season) sorghum (Sorghum bicolor L.). Twelve weed management treatments were evaluated in a randomized block design with four replications. Preemergence (PE) application of atrazine 0.5 kg/ha + pendimethalin 0.25 kg/ha as tank mixture significantly reduced weed population and weed biomass, increased the weed control efficiency at early stage, next to weed free treatment. However, at the rest of the growth stages, two HW and inter culturing (IC) at 20 and 40 DAS, atrazine 0.5 kg/ha PE + HW and IC at 20 DAS, pendimethalin 0.5 kg/ha PE + HW and IC at 20 DAS effectively controlled the weeds, reduced the weed biomass and increased the weed control efficiency. Nutrient losses by weeds were highest under unweeded control and lowest with weed free condition followed by application of atrazine 0.5 kg/ha PE + HW and IC at 20 DAS.

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“…Br.] (Limon‐Ortega et al, 1998); and annual weeds with grain sorghum (Everaarts, 1993) indicated that the number of kernels per panicle or ear was the yield component most sensitive to competition. In sorghum, the number of kernels per panicle is determined during the boot stage just before flowering (Vanderlip, 1993).…”

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confidence: 99%

Velvetleaf Interference Effects on Yield and Growth of Grain Sorghum

et al. 2003

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weed (Amaranthus retroflexus L.) and grain sorghum have shown that weed population and time of emergence Weed competition studies with grain sorghum [Sorghum bicolor influenced yield loss (Knezevic et al., 1997). Limon-(L.) Moench] are limited. Improved knowledge of growth in response to weed competition could contribute to development of sorghum hy-Ortega et al. (1998) found that narrowing rows increased brids that compete better with weeds. Velvetleaf (Abutilon theo-the competitive ability of grain sorghum with velvetleaf phrasti Medic.) competition with sorghum hybrids was evaluated in and green foxtail [Setaria viridis (L.) Beauv.]. field experiments on a Sharpsburg silty clay loam soil (fine smectitic, Growth analysis of grain sorghum has not been remesic Typic Arguidoll) in 1996 and 1997 at Lincoln, NE. The objective ported, but this method has been used to determine was to determine the effects of velvetleaf competition on interception competitive ability between crops and weeds (Holt and of photosynthetically active radiation (PAR), growth, and yield of Orcutt, 1991). A crop species or cultivar that grows faster sorghum hybrids with different heights. Sorghum hybrids used were or is larger than its neighbors will use a larger proportion 'FS2' (1.8 to 2.4 m tall) and 'DK54' and 'X260' (1.2 to 1.5 m tall).of available solar radiation, water, and/or nutrients Weed treatments included sorghum in monoculture and grown in (Roush and Radosevich, 1985). Roush and Radosevich mixture with velvetleaf. Medium-height hybrids had 0.4 greater midseason leaf area indices (LAIs) than the tall hybrid in 1996, and in

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Effects of competition with weeds on the growth, development and yield of sorghum

Cited by 22 publications

References 19 publications

Weed Management Practices for Organic Production of Trailing Blackberry: I. Plant Growth and Early Fruit Production

Weed Management Practices for Organic Production of Trailing Blackberry: I. Plant Growth and Early Fruit Production

Weed management influence on crop-weed competition in sorghum under South Gujarat conditions

Velvetleaf Interference Effects on Yield and Growth of Grain Sorghum

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