Effects of sulfosate on weed suppression, cocoa pod set, and yield of cocoa and coffee

Opong, F K; Sarfo, J. E.; Osei-Bonsu, K.; Amoah, F. M.

doi:10.4314/gjas.v39i2.2133

Cited by 3 publications

(4 citation statements)

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“…ha -1 vlv glyphosate effectively kept weed growth below economic injury level without immediate or residual adverse effects on the growth of cocoa and resulted in the higher cocoa yield above the farmers' practice of manual weed control. The result contradicts reports that showed no significant differences in the initial yields of young cocoa plots between chemical and manual weed control [12,16]. On the other hand, our result also showed that yield performance from the manually weeded plots and those sprayed with 960 g a.i.…”

Section: Plant Yield Under Different Weed Controlcontrasting

confidence: 99%

Evaluation of herbicides and manual weed control methods in the establishment of Theobroma cacao L. in Cross River State of Nigeria

Olufemi¹,

Babatunde²,

Olufemi³

et al. 2020

World J. Adv. Res. Rev.

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Field trial was conducted at the Cocoa Research Institute of Nigeria (CRIN), Ajassor substation, Cross River State, Nigeria between 2015 and 2017 to evaluate the effect of different weed control methods on the growth and yield of cocoa during their early years of establishment. Glyphosate and paraquat were applied at 480, 720, 960 and 1440 gram of active ingredient per hectare using very low volume (g a.i. ha-1 vlv) while manual weeding (i.e. slashing with cutlass) was used as the control. A Nigeria commercial cocoa variety Tc series, also known as 18-month cocoa, was established at a CRIN recommended spacing of 3 x 3 m, laid out in a Complete Randomized Block Design with four replications. All young cocoa stands were ring weeded at 50 cm diameter and covered with black polythene bags before the spraying of herbicides during the first six months of establishment to reduce injury that could result from the drifting of herbicide solution to plants during their early growth stage. Data was collected on the plant height, stem girth and number of leaves of cocoa plants while the cocoa dry beans weight and labour cost for each treatment were determined. The results showed that 960 g a.i. ha-1 vlv was the best herbicide application rate while plots under glyphosate at 960 g a.i. ha-1 vlv produced significantly higher values of plant height, stem girth and number of leaves at (p=0.05) than both paraquat at 960 g a.i. ha-1 vlv and manual weeding. Labour cost for controlling weeds with either glyphosate or paraquat at all application rates were considerably lower than cost for control (manual weeding). Glyphosate at 960 g a.i. ha-1 vlv is recommended for weed control in cocoa plantation because it encouraged higher growth and yield performance of cocoa than other treatments, had considerably cheaper cost of application than paraquat at 960 g a.i. ha-1 vlv and manual weeding, and it also ensured a weed-free environment over a longer period of time than the other treatments.

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Section: Plant Yield Under Different Weed Controlcontrasting

confidence: 99%

Evaluation of herbicides and manual weed control methods in the establishment of Theobroma cacao L. in Cross River State of Nigeria

Olufemi¹,

Babatunde²,

Olufemi³

et al. 2020

World J. Adv. Res. Rev.

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“…This result contradicts earlier reports by Oppong et al (2006) and Konlan et al (2014), which indicated no Figure 1. Dry bean yield (kg ha -1 ) of 3 year old cocoa as affected by glyphosate rates and manual weeding.…”

Section: Weed Speciescontrasting

confidence: 94%

“…Unlike the manual weed control methods, weedicides such as paraquat and glyphosate were found to lower the cost of weed control and resulted in better cocoa growth (Osei-Bonsu et al, 1991;Oppong et al, 1995Oppong et al, , 1999. Subsequent field studies in young coffee and cocoa led to similar conclusions (Oppong et al, 2006;Konlan et al 2014). Both studies went further and reported no adverse effects of glyphosate at the recommended rate of 1.5-2.0 l ha -1 on the yield of young coffee and cocoa.…”

Section: Introductionmentioning

confidence: 95%

Effect of weed management with glyphosate on growth and early yield of young cocoa (Theobroma cacao L.) in Ghana

Konlan¹,

Quaye²,

Pobee³

et al. 2019

Afr. J. Agric. Res.

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Weeds are a limitation to cocoa production, and herbicide use in cocoa cultivation is known to lower the cost of weed management and support better plant growth. As a result, glyphosate was recommended for use in cocoa cultivation following a two-year field trial at the Cocoa Research Institute of Ghana. Recent informal debates among scientists and farmers, however, point towards a disagreement regarding the effect of glyphosate on young cocoa. Consequently, an experiment was conducted from 2011 to 2013 at the Cocoa Research Institute of Ghana to re-evaluate the suitability of glyphosate (Isopropylamine) for weed management and its effects on growth and yield of young cocoa. Five rates of glyphosate viz: (i) 1,920 g active ingredient a.i. ha-1 using polyjet nozzle; (ii) 1,920 g a.i. ha-1 using very low volume (vlv) nozzle; (iii) 960 g a.i. ha-1 vlv; (iv) 720 g a.i. ha-1 vlv; (v) 480 g a.i. ha-1 vlv; and (vi) manual weeding were tested in a randomized complete block design with four replicates in the field. Effects of treatments on weeds, cocoa growth and yield were recorded for three years. In a gauze house study, cowpea and maize were used to determine residual effects of glyphosate. Emergence, survival and dry matter accumulation by these plants were recorded. Results from the gauze house study showed that glyphosate did not exhibit residual soil activity at these rates. Glyphosate at 960 g ha-1 significantly increased yield of three year old cocoa compared to the other rates and manual weeding. The 1,920 g ha-1 rates significantly reduced the initial yield of 3 year old cocoa compared to the other glyphosate rates. Cost analysis showed that glyphosate at 960 g a.i. ha-1 was Ghȼ 136.00 (11%) and Ghȼ 1,784.00 (61%) cheaper than the 1,920 g a.i. ha-1 rates and manual weeding respectively. It was therefore concluded that glyphosate can be applied at 960 g a.i. ha-1 (equivalent to 2.0 l ha-1 in 120 l of water) for effective weed management without significant adverse effects on growth and yield of young cocoa.

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“…In mature cocoa, glyphosate is the most effective herbicide. Oppong et al [119] reported that glyphosate at reduced rates (480-960 g/ha) can be used to control weeds without an adverse effect on the crop. Adeyemi [120] reported that a formulated mixture of glyphosate and terbuthylazine (2.10 to 3.15 kg/ha) was more effective as compared to hand slashing in a mature cocoa field.…”

Section: Cocoamentioning

confidence: 99%

Integrated Weed Management in Plantation Crops

Singh

Sud

2014

Recent Advances in Weed Management

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Effects of sulfosate on weed suppression, cocoa pod set, and yield of cocoa and coffee

Cited by 3 publications

References 0 publications

Evaluation of herbicides and manual weed control methods in the establishment of Theobroma cacao L. in Cross River State of Nigeria

Evaluation of herbicides and manual weed control methods in the establishment of Theobroma cacao L. in Cross River State of Nigeria

Effect of weed management with glyphosate on growth and early yield of young cocoa (Theobroma cacao L.) in Ghana

Integrated Weed Management in Plantation Crops

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