POTENCIAIS HÍDRICOS NO SOLO SOBRE A EFICÁCIA DE HERBICIDAS EM Cenchrus echinatus L.

Klar, Antônio Evaldo; Pereira, María Renata Rocha; Martins, D.

doi:10.15809/irriga.2015v1n1p123

Cited by 3 publications

(3 citation statements)

References 10 publications

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“…Plants in optimum water conditions keep their metabolism in full operation and have no additional impediments to herbicide uptake and translocation, tending to be more affected by herbicides when compared with plants under water stress. This reduction in plants without water restriction was similar to the results of Roman et al (2003), Oliveira Jr. et al (2006, Pereira et al (2010), Souza et al (2014) and Klar et al (2015), who observed lower fresh mass in plants under water restriction. The application of bentazon at 1 pm had the lowest efficiency of the herbicide compared with the other application times (Figure 2).…”

Section: Resultssupporting

confidence: 88%

“…The determination of appropriate application times is dependent on several factors, intrinsic to each region. Distinct conditions of humidity, temperature, radiation, which influence the plant's physiological activity, determine the best time for herbicide application (Oliveira Jr. and Constantin 2001;Sharma and Singh 2001;Klar et al 2015;Gomes and Juneau 2016).…”

Section: Introductionmentioning

confidence: 99%

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Control of Ipomoea grandifolia and antioxidant enzyme activity with bentazon and glyphosate at times and soil water conditions

Salomão¹,

Trezzi²,

Pagnoncelli³

et al. 2021

Commun. Plant. Sci.

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Weed management with herbicides requires favorable environmental conditions, that maximize efficiency, such as soil humidity and timing of application. The aim of this study was to assess the effect of the application timing of bentazon and glyphosate herbicides on the control and activity of antioxidant enzymes in Ipomoea grandifolia, under different conditions of soil water availability. Two experiments, one for each herbicide (bentazon and glyphosate), were conducted in a factorial design with four replicates. The first factor was the two rates of each herbicide (504 and 720 g i.a. ha -1 of bentazon and 651 and 911.4 g i.a. ha -1 of glyphosate). The second factor was the six application times (1 am; 5 am; 9 am; 1 pm; 5 pm and 9 pm). The third factor, soil water content (100% and 50% of field capacity). Plus, two controls without herbicide application. At 21 days after application (DAA) of bentazon and 28 DAA of glyphosate, the fresh mass of the aboveground plants was measured. In addition, the activities of the enzymes superoxide dismutase (SOD), catalase (CAT) and peroxidase (POX) were determined. For plants under water restriction, an increase of approximately 20% in fresh mass was observed compared in plants without water restriction, indicating lower control efficiency under water stress condition. For bentazon, at 1 pm has been observed the lowest herbicide efficiency, the other times were the most efficient, and did not differ. For glyphosate, the application at 9 am was the most efficient, while at 1 am provided the worst control efficiency. Higher CAT and SOD activities after bentazon application were observed at 1 pm. Among the three enzymes evaluated, SOD presented the highest activity after glyphosate application. Generally, the times of the day with the highest peak of enzymatic activity were distinct between with and without water restriction. Highlighted Conclusions1. Water restriction reduces the efficiency of bentazon and glyphosate. 2. Better efficiency for bentazon was observed at 1 am, 5 am, 9 am, 5 pm and 9 pm. 3. Better efficiency for glyphosate was observed at 9 am.

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Section: Resultssupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Control of Ipomoea grandifolia and antioxidant enzyme activity with bentazon and glyphosate at times and soil water conditions

Salomão¹,

Trezzi²,

Pagnoncelli³

et al. 2021

Commun. Plant. Sci.

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“…In the case of C. echinatus and C. procera, these are species sensitive to osmotic pressure. However, in our study, osmolarity values are low, almost close to zero (Klar et al, 2015;Taghvaei et al, 2012;Silva et al, 2019).…”

Section: Discussioncontrasting

confidence: 56%

Phytotoxic Activity of Guapira graciliflora (Nyctaginaceae) on Weeds

Rodrigues

Bezerra

Silva

et al. 2020

JAS

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The plants produce a variety of compounds that are not directly associated with their growth and are derived from their secondary metabolisms. Such compounds can be used in the formulation of bioherbicides, in the control of weeds. Among the chemical groups that most present allelopathic actions are the phenolic compounds which are present the flavonoids. A species rich in such compounds is Guapira graciliflora, which allows hypothesizing that it may present phytotoxic action. In this way, the objective of this research was to evaluate its phytotoxic action on the germination and growth of Cenchrus echinatus and Calotropis procera. For this purpose, aqueous extracts were prepared from fruits and leaves and applied to seeds of the species mentioned above. Pre and post germinative parameters were measured. Our results show that the extracts can retard the growth of the roots of C. echinatus and C. procera in a significant way (p <0.05), however it is not able to interfere in the number of germinated seeds or germinated seeds speed. The mechanisms of action of the allelochemicals may be related to inhibition of specific PSII sites or reduction of chlorophyll content. Guapira graciliflora presents allelochemicals in the constitution of its leaves and its fruits that affect the growth of the initial structures of C. echinatus and C. procera, with potential to be used as bioherbicides in the control of these weeds.

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Water Stress in the Production and Quality of Bidens pilosa and Raphanus raphanistrum Seeds

et al. 2018

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Plants in soils with low water availability may present a reduction of their leaf area and photosynthetic rate, as well as lower assimilated compound supply for seeds. Knowing the physiological quality and seed production of weeds generated under water deficit conditions can help understanding the survival and competition strategies of species. The objective of this work was to evaluate the effect of water stress on the production and germination of Bidens pilosa and Raphanus raphanistrum seeds. Plants were maintained in soils with different water potentials (-0.03, -0.07 and -1.5 MPa) throughout their cycle, until seed production, when they were harvested. Then, evaluations were performed to find out the number of seeds per plant and number of seeds per pod (Raphanus raphanistrum). The evaluation on the germination of these seeds was performed on moistened paper, with four replications, at 20-35 oC and 8 hours of light per day, weekly, until 28 days after seeding. The experimental design was completely randomized with three treatments (soil water potential: -0.03 MPa, -0.07 MPa and -1.5 MPa). The results were submitted to analysis of variance by F test, and the means of the treatments were compared by Tukey’s test at 5% probability. It was concluded that Bidens pilosa is more adapted to water deficit conditions than Raphanus raphanistrum, due to the higher production of seeds, better germination and seedlings with greater vigor.

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POTENCIAIS HÍDRICOS NO SOLO SOBRE A EFICÁCIA DE HERBICIDAS EM Cenchrus echinatus L.

Cited by 3 publications

References 10 publications

Control of Ipomoea grandifolia and antioxidant enzyme activity with bentazon and glyphosate at times and soil water conditions

Control of Ipomoea grandifolia and antioxidant enzyme activity with bentazon and glyphosate at times and soil water conditions

Phytotoxic Activity of Guapira graciliflora (Nyctaginaceae) on Weeds

Water Stress in the Production and Quality of Bidens pilosa and Raphanus raphanistrum Seeds

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