Ave no controle da Tiririca em Inglês (2)

PARCIAL REPORT ABOUT THE PERFORMANCE OF THE HERBICIDE 

POTENTIATOR - AVE IN THE SEDGE’S (Cyperus rotundus) CONTROL 

AT THE SEMI-ARID REGION. 

1. Objective: 

Test the efficiency of the potentiator AVE, associated to two herbicides, in the control of 

sedge at the Semi-Arid. 

2. Material and Methods: 

The first stage of this experiment was done at the experimental field of Bebedouro, on 

January 13 th , 1998, at a clay soil area of Embrapa at the Semi-Arid, in Petrolina – PE: 

Three treatments without repetitions were studied, with 847,5 m 2 each. The area was highly 

infested by weeds, infestation that varies from 857 to 1.321 plants per m², with the height of 

the plants being from 20,3 to 25,6 cm. 

The first treatment was the witness; in the second, the herbicides Roundup + AVE were used 

and the third used Glifosato + AVE. 

The recommended dosages by the potentiator’s manufacturer were: 

– 300 g of herbicide and 30 g of the potentiator AVE in 10 liters of water, which 

correspond to 260 ml of the herbicide and 30 ml of the potentiator respectively. 

When the potentiator was applied, associated to the herbicides, the soil was in good 

humidity conditions, since in the period previous to the application day (01/13/1998), the 

pluviometer rate was 29,1 mm. 

The applications started at 08:40 am and ended at 10:40 am with the highest temperature of 

31°C and the lowest of 24,6º C, Dry – 27,6°C and Humid - 23,4º C, relative humidity of 

68%. 

The equipment used to the applications was a manual costal pulverizer with 20 liters 

capacity. The time of application per treatment was of 60 minutes, with the water 

consumption of 80 liters. 

Ministério da Agricultura 

e do Abastecimento 

Empresa Brasileira de Pesquisa 

Agropecuária EMBRAPA 

Centro de Pesquisa Agropecuária 

do 

Trópico Semi-Árido 

BR 428, Km 152 

Zona Rural, C.P 23 

CEP 56300-000 

Petrolina – PE 

Fone: (081) 862-1711 

Fax: (081) 862-1744 

cpatsa@cpatsa.embrapa.br 

1

3. Results: 

The partial results obtained may be consider as extremely good, considering the following 

aspects: 

3.1 95% of the sedge plants that were in the parcels when the product was applied 

were completely dead after 20 days. 

3.2 That affirmation was understood when, soon after the application many sedge 

plants that stood up from each treatment were isolated to observe a future sprouting that 

did not happen, although there were 124 mm of rain in the period of 12 days from the 

first day of the applications (01/14/1998). 

3.3 The 5% of the sedge plants were not eliminate due to the following: 

a. The depth in which some rhizome were was from 13 to 42 cm, and they had not emerged 

when the products application was done. 

b. The density and height of the existent weeds in the area (more than seven different 

species were cataloged) probably prevented the products to reach some sedge plants that 

were below them. 

Apparently, there were no significant differences in relation to the number of dead sedge 

plants, when the Roundup was compared to the Gliphosphate. 

Complementary studies must be done to determine other parameters, such as: appropriate 

quantity of the herbicide to be applied, period of application and economic analysis. 

The complemental studies, programmed to the second stage of this study, were already 

started, and they aim mainly to determine the adequate quantity of the herbicide, in 

economic terms, since it was observed that in the first stage, probably due to the high 

quantity used (520 ml of herbicide to 20 liters of water), some cultures sowed in the area, 50 

days after the application showed a small germination percentage, which varied from 50 to 

75% that is considered technically non satisfactory to experimental areas. 






do 


BR 428, Km 152 


CEP 56300-000 


Fone: (081) 862-1711 

Fax: (081) 862-1744 


2

4. Conclusions: 

– O potentiator AVE, associated to a systemic herbicide, eliminates the sedge plants since a 

very uniform pulverization is done, in a way that all the foliar area of the plant is reached. 

– The use of the AVE potentiator, associated to a systemic herbicide, in the sedge control 

may reduce the costs of this control, since it reduces considerably the number of 

applications of the herbicide from four (manufacturer’s recommendations) to at the 

maximum two. 

Petrolina, 19th of May 1998. 






do 


BR 428, Km 152 


CEP 56300-000 


Fone: (081) 862-1711 

Fax: (081) 862-1744 


3

FINAL TECHNICAL REPORT ABOUT THE PERFORMANCE OF THE AVE 

POTENTIATOR AT THE SEMI-ARID, IN THE SEDGE (Cyperus rotundus L.) 

CONTROL 

1. Objective 

Test the efficiency of the AVE potentiator, associated to two herbicides, in the sedge control 

at the Semi-Arid region. 

2. Material and Methods: 

The second stage of this work was done at the Experimental Field of Bebedouro as well, 

which belongs to EMBRAPA Semi-Arid, at the municipal district of Petrolina, PE, at a Clay 

soil, without any cultivation, and that presented a sedge infestation percentage around 95% 

(visual evaluation), in which the population had in average 227 plants/m². In this area 12 

different species of weeds were cataloged). 

The experiment outlining was of random blocks, with five treatments of 400 m² and three 

repetitions of 2.000 m² each, being used as control element, the Roundup herbicide. The 

quantities of the herbicide applied in each treatment were of: 50; 75; 100; 125 and 150 ml, 

associated to 60ml of the AVE Potentiator. 

The evaluations were done by sinecological methods (plants counting), in areas of 1 m², in 

all treatments and repetitions. 

The experiment had duration of 150 days (May/September 98), in the period were done four 

evaluations and two applications through foliar pulverization. The applications were done 

with costal pulverizer, with the pressure and medium outflow of 2,22 kg/cm 2 e 2,21 

l/minute, respectively 

The evaluations and the pulverizations were done at the following order: 

– First evaluation on May 12th, before the first application; 

– First application on May 13th, being the sedge with medium number and height per leaf 

varying from 8 to 12 and from 16 to 25 cm, respectively; 






do 


BR 428, Km 152 


CEP 56300-000 


Fone: (081) 862-1711 

Fax: (081) 862-1744 


4

– Second evaluation on June 3rd, 21 days after the first application, being determined by 

treatment and in all repetitions, the percentage of dead plants and survivors; 

– Third evaluation on July 29 th , 77 days after the first application, with the same objectives 

of the second, and including the emerged plants as well (new plants); 

– Second application on July 30 th ; 

– Fourth evaluation on September 2nd, 34 days after the second application, with similar 

objectives from the third. 

3. Results and Discussion: 

1 – The percentage of dead sedge plants, 21 days after the first application, vary from 31% 

(50ml) to 89% (150ml) respectively. 

2 – The medium percentage of survivor plants at the same period vary from 69% (50 ml) to 

11% (150 ml), being the main cause of the plants surviving, the non direct contact with the 

applied products, since they were below other bigger weeds. 

3 – The medium percentage of dead sedge plants, after 34 days from the second application, 

vary from 93% (50 ml) to 99% (150 ml). 

4 – The medium percentage of the survivor plants in the same period, has also vary from 7% 

(50 ml) to 0,98% (150 ml), so that in this second application, the treatment 4 (125 ml 

Roundup + 60 ml AVE) have presented 100 % of dead plants. 






do 


BR 428, Km 152 


CEP 56300-000 


Fone: (081) 862-1711 

Fax: (081) 862-1744 


5

4. Conclusions: 

– The AVE potentiator associated to the Roundup herbicide, has shown to be efficient at 

the sedge (Cyperus rotundus L.), control, mainly with the higher dosages; 

– There were no significant changes between the treatments 4 and 5 (125 and 150 ml), 

respectively; 

– This efficiency becomes higher after the second application. 

Petrolina, November 16th, 1999. 






do 


BR 428, Km 152 


CEP 56300-000 


Fone: (081) 862-1711 

Fax: (081) 862-1744 


6

TREATED SEDGE 

RHIZOME 

WITNESS SEDGE 






do 


BR 428, Km 152 


CEP 56300-000 


Fone: (081) 862-1711 

Fax: (081) 862-1744 


7






do 


BR 428, Km 152 


CEP 56300-000 


Fone: (081) 862-1711 

Fax: (081) 862-1744 


8






do 


BR 428, Km 152 


CEP 56300-000 


Fone: (081) 862-1711 

Fax: (081) 862-1744 


9






do 


BR 428, Km 152 


CEP 56300-000 


Fone: (081) 862-1711 

Fax: (081) 862-1744 


10






do 


BR 428, Km 152 


CEP 56300-000 


Fone: (081) 862-1711 

Fax: (081) 862-1744 


11






do 


BR 428, Km 152 


CEP 56300-000 


Fone: (081) 862-1711 

Fax: (081) 862-1744 


12






do 


BR 428, Km 152 


CEP 56300-000 


Fone: (081) 862-1711 

Fax: (081) 862-1744 


13






do 


BR 428, Km 152 


CEP 56300-000 


Fone: (081) 862-1711 

Fax: (081) 862-1744 


14

Ave no controle da Tiririca em Inglês (2)

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