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In this study a new formulation of EPTC, the new products glyphosate and napropamide and high rates of butilate, vernolate and EPTC were tested in purple nutsedge (Cyperus rotundus L.). The slow release formulation of EPTC was more persistant than the regular EPTC. High rates (16 kgia/ha) of the ...


Piedrahíta Castañeda, WilsonDoll, Jerry D.[Aspectos recientes en el control del coquito (Cyperus rotundus L.)]Aspectos recientes en el control del coquito (Cyperus rotundus L.)

Some of the differences and similarities between the extension service agronomists and those of technical assistance were compared. Important differences in percent of time dedicated to weed control, sources of information and the importance that the farmers of each group assign to weed control w...


Doll, Jerry D.[La extensión agrícola y la asistencia técnica en el control de malezas en Colombia]La extensión agrícola y la asistencia técnica en el control de malezas en Colombia

Cutting sedge (Scleria pterota Presl.) is a common weed in pastures. It grows vigorously and forms patches in poorly drained soils and appears uniformly dispursed in pastures on rolling land. It is unpalatable to cattle and is extremely competitive with pasture species. It was found that both diu...


Argel M., Pedro J.Doll, Jerry D.[Control de cortadera (Scleria pterota Presl.) y establecimiento de pasto]Control de cortadera (Scleria pterota Presl.) y establecimiento de pasto

Since many farmers in the tropics plant crops in association, a study was conducted to determine the capacity of corn and edible beans (Phaseolus vulgaris) grown alone or in association to extract N, P and K. The effects of three soil types and three weed species on the absorptive capacity of the...


Morales, LeopoldoDoll, Jerry D.[Extracción de nutrimentos en la asociación maíz-frijol con tres especies de malezas]Extracción de nutrimentos en la asociación maíz-frijol con tres especies de malezas

Red rice (Oryza satlva L ) has been a serious problem in rice fields for hundreds of years and even now no effective control measure exist. In this study, new approaches were evaluated. Flooding for two weeks prior to seeding IR-22 eliminated 99 percent of the tall variety Bluebonnet 50, which ha...


Cheaney, Robert L.López, Rodrigo L.Doll, Jerry D.[Algunos métodos promisorios para el control de arroz rojo y arroz espontáneo de variedades indeseables]Algunos métodos promisorios para el control de arroz rojo y arroz espontáneo de variedades indeseables

The effect of shade on the growth and development of purple nutsedge (Cyperus rotundus L.) was studied to determine the feasibility of integrating cultural control (shading) with other control methods. Pots with tubers from the Departments of Córdoba and Valle were placed under shades of 0, 44, 5...


Giraldo de Sendoya, FabiolaDoll, Jerry D.[Efecto de la sombra sobre el crecimiento y desarrollo del coquito (Cyperus rotundus L.)]Efecto de la sombra sobre el crecimiento y desarrollo del coquito (Cyperus rotundus L.)
Doll, Jerry D.Piedrahíta Castañeda, Wilson[Efectos de aplicaciones repetidas de paraquat y glifosato sobre las fluctuaciones de poblaciones de malezas]Efectos de aplicaciones repetidas de paraquat y glifosato sobre las fluctuaciones de poblaciones de malezas

Information is lacking concerning the viability and longevity of weed seeds in tropical Latin America. This study observed the germinative ability of seeds of 20 weed species common in annual crops and 12 common pasture weeds for two years. They were collected, cleaned and stored dry in the labor...


Doll, Jerry D.Piedrahíta Castañeda, WilsonArgel M., Pedro J.[Capacidad germinativa de semillas de 32 especies de malezas]Capacidad germinativa de semillas de 32 especies de malezas

The most serious weed problems faced by ranchers are comprised of brushy species. Foliar, cut-stump, basal and soil applications of herbicides were evaluated on the most common species on ranches of the North Coast of Colombia from 1972 through 1975. Most of the species tested were resistant to f...


Argel M., Pedro J.Doll, Jerry D.[Control de arbustos en potreros : resumen de cuatro años de investigación]Control de arbustos en potreros : resumen de cuatro años de investigación

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