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Facultad De Ciencias Agrarias Y Forestales Universidad Nacional De La Plata Tomo 102 (1), 1997 La Plata, Argentina Facultad de Ciencias Agrarias y Forestales Universidad Nacional de La Plata Original from THE UNIVERSITY OF TEXAS CONTENIDO Efecto de la edad, el lavado y la temperatura sobre la germinación de las sem illas inmaduras, el crecimiento radicular y el tiempo hasta la floración, de la soja GOSPARINI C.O.. E N. MORANOI & C.A. CAIRO ------ ----------------------------------------------J 1-9 Relación entre biomasa aérea, área foliar y tipos de suelos en plantaciones de Eucalyptus grandis del NE de Entre Ríos, Argentina GOYAJ. F., J.L. FRANGI 8. F. DALLA TEA 11-21 Replantación de Eucalyptus grandis : efectos de la quema de residuos y fertilización en suelos arenosos del noreste de Entre Ríos DALLA TEA F ------------------------------------------------------------------------- ■-------------- —---------------- Caracterización morfológica de clones de Cyperus rotundas y C. esculentus del sudeste de la provincia de Buenos Aires Alonso s i., j.j. eyherabide & m.i. leaden --------------------------------------------------—*— • njg •-------- 33-44 La materia orgánica en un suelo bajo labranza convencional y siembra directa: análisis comparativo del perfil de distribución y el fraccionamiento físico Nico A.I., A. Aragón & H.O Chioichimo 45-50 Incidencia de la colocación de cuchillas circulares sobre patrones de roturación y energía requerida en escarificadores de arcos rígidos balbuena r . h .. a . m . terminiello , j . a . claverie , p . M. Mac DONAGH & R. BARTOSIK ------------------------ 51-57 Pulgones de la Patagonia Argentina con la descripción de Aphis intrusa sp. n. (Homoptera: Aphididae) ORTEGO J.------------------------------------------------------------------------------------- ---------—-— 59-80 Variación numérica de los coleópteros del suelo en un cultivo de frutilla sujeto a fertilización orgánica y convencional MARASAS M. E., A. C. ClCCHINO & M. I. URRUTIA 818« Determinación de la demanda química de oxígeno de aguas residuales de agroindustrias por colorimetría con reactivo concentrado CÓRDOBA P. R & F. SlNERIZ ----------- 87-90 Propagación clonal por enraizamiento de estacas de yerba mate (Hex paraguariensis ) y su promoción por 4-clororesorcinol CASO O. H & L. A. DOTTA ---------- ------------------------------------------------------------------ ----- 91-95 Análisis de los cambios en las comunidades de malezas en sistemas de siembra directa y sus factores determinantes PURICELLI E.C. & D.H. TUESCA ------------------------------------- ------ -------------- -------- - r -X COMENTARIOS OE LIBROS INSTRUCCIONES PARA LOS AUTORES Original from : UNIVERSÍTY OF TEXAS Effects of age, washing and temperature on the germination of immature seeds, the growth of the radicle, and the time to flowering, In soybean Gosparini C.O., E.N. Morandi & C.A. Ca ir o _____________________________________ -9 Relationship among aboveground biomass, leaf area and soil types in Eucalyptus grandis plantations from NE Entre Rios, Argentina Goya J. F., J.L. Frangi & F. D alla T ea __________________________________ 11-21 Effects of slash burning and fertilizer application on Eucalyptus grandis replanting in sandy soils of northeastern Entre Rios D alla Tea F. _______________________________________________________________ 23-31 Morphological characterization of Cyperus rotundus and Cyperus escu/entus clones from the south east of Buenos Aires province A lonso S.I., J.J. Eyherabide & M.l. Leaden __________________________________________33-44 Organic matter in a soil under conventional tillage and no tillage: comparative analysis of distribution profile and physical fractioning Nico A.I., A. A rag On & H.O C hidichimo ____________________________________________ 45-50 Rotary coulter position effects upon rigid shank's chisel plows performance Balbuena R. H., A. M. T erminiello , J. A. C laverie , P. M. Mac D onagh & R. Bartosik _ 51-57 Aphids of argentine Patagonia with description of Aphis Intrusa sp. n. (Homoptera: Aphididae) Ortego J . _________________________________________________________________ 59-80 Numeric variations of soil coleoptera in a strawberry crop under organic and conventional fertilization Marasas M. E .f A. C. C icchino & M. 1. U rrutia _______________________________ 81-86 Evaluation of the chemical oxigen demand of agriculture-industrial waste waters by the spectrophotometrtc method using concentrated reagent Cordoba P. R. & F. S ineriz ____________________________________________________ 87-90 Cional propagation by rooting of cutting of Hex paraguarfensls and the stimulant effect of 4-clororesorcinol Caso O. H. & L. A. D otta __________________________________________________ 9 5 Analysis of weed community changes and their determining factors in no-tiliage systems P uricelli E.C. & D.H. Tuesca __________________________________________ 97-118 B o o k s R e v ie w 119-120 I nstructions t o a u t h o r s 121-127 Original from THE UNIVERSITY OF TEXAS Revista de la Facultad de Agronomía Tomo 102 (1), 1997 La Plata, Argentina ISSN 0041-8676 LATIN i AUG 2 7 1998 UNWE«snvoFT®< at AUSTIN Facultad de Ciencias Agrarias y Forestales Universidad Nacional de La Plata Original from THE UNIVERSITY OF TEXAS Original from THE UNIVERSITY OF TEXAS AGRADECIMIENTO El Decano de la Facultad de Ciencias Agrarias y Forestales Ing. Agr. José Beltramo, agradece al Sr. Presidente de la Honorable Cámara de Diputados de la Provincia de Buenos Aires - Diputado Pcial. Francisco Ferro, el interés y apoyo brindado para la edición de la revista. Original frem THE UNIVERSITY OF TEXAS Revista de la Facultad de Agronomie, La Plata 102 (1), 1997 Efecto de la edad, el lavado y la tem peratura sobre la germinación de las semillas inmaduras, el crecimiento radicular y el tiempo hasta la floración, de la soja C .O . G o s p a r in i 1, E .N . M o r a n d i & C .A . C a ir o Cátedra de Fisiología Vegetal. Facultad de Ciencias Agrarias. UNR CC 14, 2123 Zavalla. Santa Fe, Argentina G osparini C.O., E.N. M orandi & C.A. Cairo . 1997. Efecto de la edad, el lavado y la temperatura sobre la germinación de las semillas inmaduras, el crecimiento radicular y el tiempo hasta la floración, de la soja. Rev. Fac. de Agronomía, La Plata 102 (1): 1*9. Se estudiaron los efectos de la edad, el lavado y la temperatura sobre la inducción de la germina­ ción precoz, el crecimiento de la radícula, y el tiempo hasta la floración de plantas provenientes de semillas inmaduras de soja [Glycine max (L.) Merr.) cv. Williams. Las semillas se cosecharon a los 25; 30; 35 y 40 días después de antesis (ODA). Las mismas se lavaron durante; 0. 12, 24 y 48 h en agua destilada aireada a 20; 25; 30 y 35*C. La germinación se continuó luego en oscuridad, a las mismas temperaturas. Se utilizó un diseño factorial; 4x4x4 (edad x tiempo de lavado x temperatu­ ra) con dos repeticiones de 20 semillas. Para cada edad se agregó un testigo con semillas maduras y secas (>60 ODA). Tanto el porcentaje como la tasa de germinación aumentaron en proporción directa con la edad. El lavado, independientemente del tiempo, estimuló la germinación y los even­ tos postgerminativos tempranos. Temperaturas de 20 a 30‘ C no modificaron la tasa de germinación ni la de crecimiento radicular, pero ambas cayeron abruptamente a 35*C. Esta temperatura inhibió, además, el establecimiento de las plántulas provenientes de embriones de 25 y 30 DDA. A partir de los 35 DDA el porcentaje de plántulas establecidas se independizó de la temperatura. Los días hasta la floración aumentaron en proporción inversa a la edad de las semillas. El lavado redujo los días hasta la floración de las plantas provenientes de semillas inmaduras. Temperaturas de 20 a 30X durante la germinación no tuvieron efecto sobre el tiempo hasta la floración. Palabras clave: Soja, semillas inmaduras, germinación precoz, temperatura, floración. G osparini C.O., E.N. M oranoi & C.A. C airo . 1997. Effects of age, washing and temperature on the germination of immature seeds, the growth of the radicle, and the time to flowering, in soybean. Rev. Fac. de Agronomia. La Plata 102 (1): 1-9. The effects of seed age, washing time and temperature on the precocious germination, radicle growth and time io flowering of immature soybean seeds[Glycine max (L.) Merr.] cv. Williams, were studied. Seeds of 25. 30. 35 and 40 days after antesis (DAA) were used. Washing was done with distilled aerated water, during; 0. 12, 24 and 48 h, at 20, 25, 30 and 35'C. The germination of the seed was continued in Petri dishes, in the dark, at the same temperatures. A factorial design 4x4x4 (age x washing time x temperature) with two replicates of 20 seeds was used. A control of mature and dry seeds (> 60 DAA) was included. Both, germination percentage, and radicie growth rate increased with seed age. Washing stimulated germination and early post-germinative events independently of the washing time. Temperatures of 20 and 30 *C did not change neither germination rate nor radicie growth irate, but both parameters dropped abruptly at 35*C. This temperature also inhibited seedling survival of 25 and 30 DDA seeds. After 35 DAA the survival of seedlings became temperature independent. Days to flower increased inversely to the age of the seeds. Washing shortened the time to flowering in plants produced by immatured seeds. Temperatures betweeen 20 to 30°C during germination did not have an effect on flowering time. Key words: Soybean, immature seeds, precocious germination, temperature, flowering. r Becar*odel CONICET Recibtdo: 09/08/96. Aceptado: 29/05/97 1 Original from
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