The Critical Period of Johnsongrass (<i>Sorghum halepense</i>) Control in Field Corn (<i>Zea mays</i>)

Ghosheh, Hani Z.; Holshouser, David Lee; Chandler, James M.

doi:10.1017/s0043174500094960

Cited by 42 publications

(41 citation statements)

References 4 publications

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“…The duration of the critical period of weed control was 14 weeks in 1991 and 11.2 weeks in 1993, but was shortened to 5.1 weeks in 1992. Ghosheh et al . (1996) pointed out that long critical periods are indicative of more competitive weeds or less competitive crops (Oliver, 1988).…”

Section: Resultsmentioning

confidence: 99%

“…The concept of critical period describes the early period of crop growth when weeds need to be controlled to prevent yield reduction (Zimdahl, 1980). The critical period for weed control is constituted by the overlap of two components: the minimum weed‐free period and the maximum weed‐infested period (Ghosheh et al ., 1996). The critical period for weed control has been determined for several field (Van Acker et al ., 1993; Woolley et al ., 1993) and vegetable crops (Roberts, 1976; Friesen, 1979; Weaver & Tan, 1987; Baziramakenga & Leroux, 1994).…”

Section: Introductionmentioning

confidence: 99%

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Critical period of weed control in transplanted chilli pepper

Amador-Ramírez

2002

Weed Res

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Summary Field experiments were conducted from 1991 to 1993 to determine the critical period of weed control in chilli pepper. The maximum weed‐infested period ranged between 0.7 and 3.2 weeks after transplanting (WAT) at a 5% yield loss level. To prevent losses in total and marketable yields, weeds should be removed 2.1 or 0.9 WAT respectively. The end of the critical period decreased as the predetermined yield loss level increased from 2.5% to 10%. The minimum weed‐free period ranged between 6.7 and 15.3 WAT at a 5% yield loss level depending on crop yield category. The chilli pepper crop required an average of 12.2 weeks of weed‐free maintenance to avoid losses above 5%. Using a 5% yield loss level, the duration of the critical period of weed control was 14 weeks in 1991 and 11.2 weeks in 1993, but was shortened to 5.1 weeks in 1992. The results suggest that weeds must be controlled during the first half of the crop's growing season in order to prevent yield losses.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Critical period of weed control in transplanted chilli pepper

Amador-Ramírez

2002

Weed Res

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“…The estimated cost of weed control in 2005–2007 in Italy ranged from 3.5% to 6.0% of the annual value of the crop yield and is approximately equivalent to 80–90 € ha −1 . Therefore, the beginning and end of the CPWC was determined taking into account an average acceptable yield loss of 5% (CPWC5%), a value also widely used for annual crops (Ghosheh et al. , 1996).…”

Section: Methodsmentioning

confidence: 99%

Weed‐poplar competition dynamics and yield loss in Italian short‐rotation forestry

2010

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In recent years there has been increasing interest in short-rotation poplar plantations for biomass production and cropping techniques and weed control strategies are being developed. Slow initial poplar growth can favour weed infestation and so there is a need for appropriate timing of weed control, based on an understanding of the competitive relationship and dynamics between poplar and weeds. A field experiment with annual and biennial crop cycles was conducted over two years. A 35 cm wide within-row weedy strip was allowed to develop as the basis for competition. Yield data were fitted with sigmoidal equations, in order to find the critical point (CP) and critical period of weed control (CPWC), using thermal time as the independent variable. Results showed that poplar is very sensitive to weed competition, especially in the first growing season after planting or cutting, and that competition can cause important yield losses. In the annual cycle, the CP corresponds to a yield loss of 26% and 8% in the first and second growing season respectively; in the biennial cycle the CP corresponds to a yield loss of 29%. Furthermore, the CPWC is long. For example, in the first year, based on a 5% yield loss, it lasts from 30 to 84 days after planting. This makes effective weed control difficult to achieve only using a pre-emergence herbicide, and thus necessitates a post-emergence treatment, either with herbicides or inter-row cultivation. These results, together with the inability of the crop to recover from damage, mean that resources must be invested in weed control soon after the beginning of the cropping cycl

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“…Studies have been conducted around the world to determine the CPWC in various crops, with a range of environmental conditions (Bedmar et al 1999;Bukun 2004;Dawson 1970;Evans et al 2003;Ghosheh et al 1996;Halford et al 2001;Hall et al 1992;Norsworthy and Oliveira 2004;Van Acker et al 1993). A weed-free period of 50 d following sowing was required to prevent yield loss in Chapingo, Mexico (Nieto et al 1968).…”

Section: Introductionmentioning

confidence: 99%

The Critical Period for Weed Control in Corn in Turkey

et al. 2006

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Field studies were conducted in 2001 and 2002 in the Black Sea Region of northern Turkey to determine the critical period for weed control (CPWC) in corn and the effects of weed interference on corn height. Treatments of increasing duration of weed interference and weed-free period were imposed at weekly intervals from 0 to 12 wk after crop emergence (WAE). The CPWC was determined with the use of 2.5, 5, and 10% acceptable yield loss levels by fitting logistic and Gompertz equations to relative yield data. With 5% yield loss level, the CPWC was 5 wk, starting at 0.2 WAE and ending at 5.2 WAE, which corresponded to the one- to five-leaf stage of corn. The CPWC increased to 8.9 wk, starting at 0 WAE and ending at 8.9 WAE, at the 2.5% yield loss level. At 10% yield loss level, the CPWC decreased to 1.7 wk, starting at 2.1 WAE and ending at 3.8 WAE.

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The Critical Period of Johnsongrass (Sorghum halepense) Control in Field Corn (Zea mays)

Cited by 42 publications

References 4 publications

Critical period of weed control in transplanted chilli pepper

Critical period of weed control in transplanted chilli pepper

Weed‐poplar competition dynamics and yield loss in Italian short‐rotation forestry

The Critical Period for Weed Control in Corn in Turkey

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