Period of Weed Interference in Guarana Crop

Soares, Daniel Oscar Pereira; Albertino, Sônia Maria Figueiredo; Souza, Felipe Cardoso; Santos, Aldenir Feitosa dos; Silva, J.F.

doi:10.1590/s0100-83582019370100070

Cited by 4 publications

(3 citation statements)

References 7 publications

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“…In recent surveys on critical period of weed interference in orange tree and guarana crops conducted in Amazonas State, there was a loss of productivity compared to control of 34% for orange (Gonçalves et al, 2018) and 65% for guarana (Soares et al, 2019).…”

Section: Productivity and Periods Of Interference Of Weed Plantsmentioning

confidence: 99%

Critical period of weeds interference in pineapple (Ananas comosus [L.] Merr.) crops

Oliveira¹,

Santos²,

Leite³

et al. 2021

Biotechnol. Agron. Soc. Environ.

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Description of the subject. In crop-weed competition, some periods are critical because they may interfere with the crop production capacity. Therefore, knowing these periods is crucial when deciding on the best time for control and preparation of the Integrated Management Program. Objectives. To determine the Period Prior to Interference, Total Period for Interference Prevention, and the Critical Interference Period in pineapple cultivation. Method. The experimental design consisted of randomized blocks in 2 x 15 factorial arrangement, four replications, and two management systems: weeds control and crop-weeds coexistence; 15 increasing periods of 30 days each after planting: 0, 30, 60, 90, 120, 150, 180, 210, 240, 270, 300, 330, 360, 390, 420. In the control treatments, since planting, manual weeding (with hoe) and mechanical weeding (with brush cutter) were done during increasing periods of time, and in the coexistence treatments, the weeds lived together with pineapple plants and, at the end of each period, weeds control was made with mechanical and chemical weeding. Results. The best yields were achieved in the periods of less coexistence with weeds. The critical periods for interference prevention with 5 and 10% of yield losses were 259 and 204 days, respectively. Conclusions. The critical period for interference prevention lasted 14-259 days after planting of the pineapple offsets.

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Section: Productivity and Periods Of Interference Of Weed Plantsmentioning

confidence: 99%

Critical period of weeds interference in pineapple (Ananas comosus [L.] Merr.) crops

Oliveira¹,

Santos²,

Leite³

et al. 2021

Biotechnol. Agron. Soc. Environ.

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show abstract

“…Weed interference reduces guarana production by up to 65%. Therefore, weed management is necessary to enable production [ 4 ]. The use of herbicides has advantages over mechanical control since it is more efficient in controlling aggressive weed species and in high air relative humidity and abundant rainfall conditions.…”

Section: Introductionmentioning

confidence: 99%

Using Glyphosate on Guarana Seedlings in the Amazon

et al. 2023

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The seed yield of guarana (Paullinia cupana H.B.K. var. sorbilis) is affected by weeds. Management is difficult for Amazon farmers and ranchers, owing to the hot and humid climate prevailing in the region, which makes mechanical control inefficient and leads farmers to the decision to use herbicides. Herbicide damage to this species is unknown. The objective of this study was to evaluate glyphosate damage to the development and quality of guarana seedlings. The treatments consisted of glyphosate doses at concentrations of 0, 126, 252, 540, 1080, 2160 and 3240 g a.e. ha−1 and were evaluated for 60 days, in two applications. Analyses were performed for biometrics, seedling development, anthracnose and Injury characteristics. Glyphosate caused symptoms of Injury in all doses applied, but lower doses did not interfere with seedling growth and development. There was a correlation between anthracnose severity and increased glyphosate dose. When applied correctly, glyphosate can be an integrated weed management tool for use in guarana crops.

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“…Among phytosanitary factors, weed control has great relevance in the production of guarana. The research of Soares, Albertino, Souza, Santos, and Silva (2019) found that in areas without weed control, production may be reduced by up to 50%. Although some studies have found evidence that the use of herbicides is efficient and cheap for weed control in guaranazeiro crops, there are no registered products in Brazil (Fontes & Nascimento Filho, 2007).…”

Section: Introductionmentioning

confidence: 99%

Photosynthetic Performance of Guaranazeiro Plants as Affected by Glyphosate Application

Leite¹,

Pinto²,

Santos³

et al. 2020

JAS

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The unsuitable use of herbicides damages many cultures. In cases of high infestations and presence of aggressive weed species in guarana (Paullinia cupana) culture, glyphosate application is advisable, but its impact on guarana physiology is unknown. Therefore, leaf photosynthetic characteristics were measured with the aim of identifying if the photosynthetic performance of guaranazeiro plants is affected in response to glyphosate application. Three glyphosate doses (0 (control); 324 and 432 g a.i. ha-1) were applied to two guaranazeiro cultivars (BRS-Andirá and BRS-Maués) selected on the basis of productive performance. An analysis was made of the effects of these doses on characteristics that represent the photosynthetic process: gas exchange, maximum quantum efficiency of PSII, performance index and chlorophyll content. The application of glyphosate did not affect the short-term responses relative chlorophyll content (SPAD index) and light use (chlorophyll a fluorescence). After 168 h, there were changes only in gas exchange variables. The effects of glyphosate doses on gas exchange was different between guaranazeiro cultivars. The photosynthetic performance of the guaranazeiro seems to be tolerant to the effects of short-term of glyphosate application.

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Period of Weed Interference in Guarana Crop

Cited by 4 publications

References 7 publications

Critical period of weeds interference in pineapple (Ananas comosus [L.] Merr.) crops

Critical period of weeds interference in pineapple (Ananas comosus [L.] Merr.) crops

Using Glyphosate on Guarana Seedlings in the Amazon

Photosynthetic Performance of Guaranazeiro Plants as Affected by Glyphosate Application

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