Publisher: SciELO   (Total: 911 journals)

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Showing 601 - 800 of 911 Journals sorted alphabetically
Revista Chilena de Anatomia     Open Access  
Revista Chilena de Cardiología     Open Access  
Revista Chilena de Cirugía     Open Access   (Followers: 1)
Revista Chilena de Derecho     Open Access   (Followers: 2, SJR: 0.645, CiteScore: 0)
Revista Chilena de Derecho Privado     Open Access   (Followers: 1)
Revista Chilena de Enfermedades Respiratorias     Open Access  
Revista Chilena de Infectología     Open Access   (SJR: 0.202, CiteScore: 0)
Revista Chilena de Literatura     Open Access   (Followers: 2, SJR: 0.16, CiteScore: 0)
Revista Chilena de Neuro-Psiquiatria     Open Access   (SJR: 0.137, CiteScore: 0)
Revista Chilena de Nutricion     Open Access   (Followers: 1, SJR: 0.167, CiteScore: 0)
Revista Chilena de Obstetricia y Ginecologia     Open Access   (Followers: 1, SJR: 0.139, CiteScore: 0)
Revista Chilena de Pediatria     Open Access   (Followers: 1, SJR: 0.171, CiteScore: 0)
Revista Chilena de Radiologia     Open Access   (SJR: 0.124, CiteScore: 0)
Revista Ciência Agronômica     Open Access   (SJR: 0.498, CiteScore: 1)
Revista Ciencia y Cultura     Open Access  
Revista Ciencias Técnicas Agropecuarias     Open Access  
Revista Científica Ciencia Médica     Open Access  
Revista Científica de la UCSA     Open Access  
Revista Científica General José María Córdova     Open Access  
Revista Clínica de Medicina de Familia     Open Access   (Followers: 4)
Revista Clínica de Periodoncia, Implantología y Rehabilitación Oral     Open Access   (Followers: 2)
Revista Colombiana de Anestesiología     Open Access   (Followers: 1, SJR: 0.154, CiteScore: 0)
Revista Colombiana de Antropologia     Open Access   (Followers: 2, SJR: 0.232, CiteScore: 0)
Revista Colombiana de Biotecnología     Open Access   (Followers: 1)
Revista Colombiana de Cancerología     Open Access   (SJR: 0.106, CiteScore: 0)
Revista Colombiana de Cardiologia     Open Access   (SJR: 0.113, CiteScore: 0)
Revista Colombiana de Ciencias Químico-Farmacéuticas     Open Access   (Followers: 1)
Revista Colombiana de Educación     Open Access  
Revista Colombiana de Entomología     Open Access   (Followers: 1, SJR: 0.184, CiteScore: 0)
Revista Colombiana de Estadística     Open Access   (SJR: 0.361, CiteScore: 1)
Revista Colombiana de Matemáticas     Open Access   (Followers: 1, SJR: 0.136, CiteScore: 0)
Revista Colombiana de Psicología     Open Access   (SJR: 0.151, CiteScore: 0)
Revista Colombiana de Química     Open Access   (Followers: 1, SJR: 0.115, CiteScore: 0)
Revista Contabilidade & Finanças     Open Access   (SJR: 0.145, CiteScore: 0)
Revista Costarricense de Cardiología     Open Access  
Revista Costarricense de Psicología     Open Access  
Revista Cubana de Anestesiología y Reanimación     Open Access   (Followers: 1)
Revista Cubana de Angiología y Cirugía Vascular     Open Access  
Revista Cubana de Cirugía     Open Access  
Revista Cubana de Endocrinología     Open Access   (Followers: 1)
Revista Cubana de Enfermería     Open Access   (Followers: 2, SJR: 0.102, CiteScore: 0)
Revista Cubana de Estomatologí­a     Open Access   (SJR: 0.128, CiteScore: 0)
Revista Cubana de Hematología, Inmunología y Hemoterapia     Open Access   (SJR: 0.196, CiteScore: 0)
Revista Cubana de Información en Ciencias de la Salud     Open Access   (SJR: 0.229, CiteScore: 0)
Revista Cubana de Informática Médica     Open Access  
Revista Cubana de Investigaciones Biomédicas     Open Access   (Followers: 1, SJR: 0.13, CiteScore: 0)
Revista Cubana de Medicina     Open Access   (Followers: 2)
Revista Cubana de Medicina General Integral     Open Access   (Followers: 1, SJR: 0.263, CiteScore: 0)
Revista Cubana de Medicina Militar     Open Access   (Followers: 1, SJR: 0.202, CiteScore: 0)
Revista Cubana de Medicina Tropical     Open Access   (SJR: 0.143, CiteScore: 0)
Revista Cubana de Obstetricia y Ginecología     Open Access   (SJR: 0.191, CiteScore: 0)
Revista Cubana de Oftalmología     Open Access   (Followers: 1)
Revista Cubana de Ortopedia y Traumatologí­a     Open Access   (SJR: 0.101, CiteScore: 0)
Revista Cubana de Plantas Medicinales     Open Access   (Followers: 1, SJR: 0.127, CiteScore: 0)
Revista Cubana de Salud Pública     Open Access   (SJR: 0.262, CiteScore: 0)
Revista da Educação Física : UEM     Open Access   (Followers: 1)
Revista da Escola de Enfermagem da USP     Open Access   (Followers: 2, SJR: 0.279, CiteScore: 1)
Revista da Faculdade de Educação     Open Access  
Revista da Sociedade Brasileira de Fonoaudiologia     Open Access  
Revista da Sociedade Brasileira de Medicina Tropical     Open Access   (SJR: 0.658, CiteScore: 1)
Revista de Administração - RAUSP     Open Access   (Followers: 1)
Revista de Administração Contemporânea     Open Access  
Revista de Administração de Empresas     Open Access   (Followers: 1, SJR: 0.16, CiteScore: 0)
Revista de Administração Pública     Open Access   (SJR: 0.294, CiteScore: 0)
Revista de Análisis Económico     Open Access   (SJR: 0.112, CiteScore: 0)
Revista de Antropologia     Open Access   (Followers: 4, SJR: 0.102, CiteScore: 0)
Revista de Bioética y Derecho     Open Access  
Revista de Biología Marina y Oceanografía     Open Access   (SJR: 0.23, CiteScore: 0)
Revista de Biología Tropical     Open Access   (Followers: 1, SJR: 0.326, CiteScore: 1)
Revista de Ciencia Politica     Open Access   (Followers: 2, SJR: 0.368, CiteScore: 1)
Revista de Ciencia y Tecnología     Open Access  
Revista de Ciências Agrárias     Open Access  
Revista de Ciencias Médicas de Pinar del Río     Open Access  
Revista de Ciencias Sociales     Open Access   (Followers: 1)
Revista de Cirugía     Open Access   (SJR: 0.121, CiteScore: 0)
Revista de Derecho     Open Access   (SJR: 0.364, CiteScore: 0)
Revista de Derecho (Concepción)     Open Access   (Followers: 2)
Revista de Derecho (Coquimbo)     Open Access  
Revista de Economía     Open Access   (Followers: 1)
Revista de Economia Contemporânea     Open Access   (SJR: 0.121, CiteScore: 0)
Revista de Economía del Caribe     Open Access  
Revista de Economia e Sociologia Rural     Open Access   (Followers: 2, SJR: 0.265, CiteScore: 0)
Revista de Economía Institucional     Open Access   (SJR: 0.141, CiteScore: 0)
Revista de Economia Poli­tíca     Open Access   (Followers: 1, SJR: 0.282, CiteScore: 0)
Revista de Enfermagem Referência     Open Access   (Followers: 2)
Revista de Estudios Historico-Juridicos     Open Access   (Followers: 1, SJR: 0.123, CiteScore: 0)
Revista de Estudios Sociales     Open Access   (Followers: 2, SJR: 0.166, CiteScore: 0)
Revista de Filosofia     Open Access   (SJR: 0.102, CiteScore: 0)
Revista de Filosofía Open Insight     Open Access  
Revista de Geografía Norte Grande     Open Access   (Followers: 1, SJR: 0.296, CiteScore: 1)
Revista de Gestão Costeira Integrada     Open Access   (SJR: 0.251, CiteScore: 1)
Revista de Historia (Concepción)     Open Access   (Followers: 1)
Revista de Historia del Derecho     Open Access   (Followers: 1)
Revista de Ingeniería     Open Access  
Revista de Investigacion Psicologica     Open Access  
Revista de la Academia Colombiana de Ciencias Exactas, Físicas y Naturales     Open Access   (Followers: 1)
Revista de la Asociación Española de Neuropsiquiatría     Open Access  
Revista de la Ciencia del Suelo y Nutricion Vegetal     Open Access   (Followers: 1, SJR: 0.224, CiteScore: 0)
Revista de la Construcción     Open Access   (SJR: 0.234, CiteScore: 1)
Revista de la Facultad de Agronomía     Open Access   (Followers: 3)
Revista de la Facultad de Derecho : Universidad de la República     Open Access  
Revista de la Facultad de Derecho y Ciencias Políticas     Open Access  
Revista de la Facultad de Medicina (México)     Open Access   (Followers: 1)
Revista de la Sociedad Boliviana de Pediatría     Open Access  
Revista de la Sociedad Española de Enfermería Nefrológica     Open Access  
Revista de la Sociedad Química del Perú     Open Access   (Followers: 1)
Revista de la Sociedad Venezolana de Microbiologia     Open Access  
Revista de la Universidad Industrial de Santander. Salud     Open Access  
Revista de Medicina Veterinaria     Open Access  
Revista de Microbiologia     Open Access   (Followers: 1)
Revista de Nutrição     Open Access   (SJR: 0.282, CiteScore: 0)
Revista de Odontologia da UNESP     Open Access  
Revista de Odontologia da Universidade de São Paulo     Open Access  
Revista de Osteoporosis y Metabolismo Mineral     Open Access   (Followers: 2, SJR: 0.121, CiteScore: 0)
Revista de Otorrinolaringología y Cirugía de Cabeza y Cuello     Open Access  
Revista de Protección Vegetal     Open Access  
Revista de Psicología del Trabajo y de las Organizaciones     Open Access   (SJR: 0.418, CiteScore: 1)
Revista de Psiquiatria Clínica     Open Access   (Followers: 1, SJR: 0.271, CiteScore: 1)
Revista de Psiquiatria do Rio Grande do Sul     Open Access   (Followers: 1)
Revista de Salud Animal     Open Access  
Revista de Salud Pública     Open Access   (Followers: 1, SJR: 0.171, CiteScore: 0)
Revista de Saúde Pública     Open Access   (Followers: 1, SJR: 0.807, CiteScore: 2)
Revista de Sociologia e Polí­tica     Open Access   (Followers: 2, SJR: 0.482, CiteScore: 0)
Revista del Instituto de Medicina Tropical     Open Access  
Revista del Nacional     Open Access   (Followers: 1)
Revista Dental Press de Ortodontia e Ortopedia Facial     Open Access   (Followers: 1)
Revista Diacrítica     Open Access  
Revista Direito GV     Open Access   (Followers: 1)
Revista do Colégio Brasileiro de Cirurgiões     Open Access   (SJR: 0.221, CiteScore: 1)
Revista do Departamento de Psicologia. UFF     Open Access  
Revista do Hospital das Clinicas     Open Access  
Revista do Instituto de Estudos Brasileiros     Open Access   (Followers: 1)
Revista do Instituto de Medicina Tropical de São Paulo     Open Access   (SJR: 0.669, CiteScore: 1)
Revista Dor     Open Access  
Revista Ecuatoriana de Neurología     Open Access   (Followers: 1)
Revista EIA     Open Access   (Followers: 1)
Revista electrónica de investigación educativa     Open Access   (Followers: 1, SJR: 0.187, CiteScore: 0)
Revista Electronica Educare     Open Access   (Followers: 2)
Revista Española de Cirugía Oral y Maxilofacial     Open Access   (Followers: 1, SJR: 0.117, CiteScore: 0)
Revista Española de Enfermedades Digestivas     Open Access   (SJR: 0.417, CiteScore: 1)
Revista Española de Salud Pública     Open Access   (SJR: 0.249, CiteScore: 1)
Revista Española de Sanidad Penitenciaria     Open Access   (SJR: 0.135, CiteScore: 0)
Revista Estudos Feministas     Open Access   (SJR: 0.208, CiteScore: 0)
Revista Facultad de Ciencias Económicas: Investigación y Reflexión     Open Access  
Revista Facultad de Ingenieria - Universidad de Tarapaca     Open Access   (Followers: 1)
Revista Facultad de Ingeniería Universidad de Antioquia     Open Access   (Followers: 1, SJR: 0.172, CiteScore: 0)
Revista Facultad de Medicina de la Universidad Nacional de Colombia     Open Access   (SJR: 0.125, CiteScore: 0)
Revista Facultad Nacional de Agronomía, Medellín     Open Access   (SJR: 0.138, CiteScore: 0)
Revista Facultad Nacional de Salud Pública     Open Access  
Revista Gaúcha de Enfermagem     Open Access   (SJR: 0.225, CiteScore: 1)
Revista Geológica de América Central     Open Access  
Revista Geológica de Chile     Open Access   (Followers: 1)
Revista Gerencia y Políticas de Salud     Open Access   (SJR: 0.136, CiteScore: 0)
Revista Habanera de Ciencias Médicas     Open Access   (SJR: 0.211, CiteScore: 0)
Revista Historia y Sociedad     Open Access  
Revista IBRACON de Estruturas e Materiais     Open Access   (Followers: 1)
Revista Ingeniería Biomédica     Open Access   (Followers: 1)
Revista Ingenieria de Construcción     Open Access   (Followers: 1, SJR: 0.204, CiteScore: 0)
Revista Ingenierías Universidad de Medellín     Open Access  
Revista Integra Educativa     Open Access  
Revista Interamericana de Bibliotecología     Open Access   (Followers: 7)
Revista Internacional de Contaminación Ambiental     Open Access   (SJR: 0.152, CiteScore: 0)
Revista ION     Open Access  
Revista IUS     Open Access  
Revista Katálysis     Open Access  
Revista Lasallista de Investigación     Open Access   (SJR: 0.146, CiteScore: 0)
Revista Latino-Americana de Enfermagem     Open Access   (SJR: 0.339, CiteScore: 1)
Revista Latinoamericana de Bioética     Open Access  
Revista Latinoamericana de Ciencias Sociales, Niñez y Juventud     Open Access   (Followers: 1)
Revista Latinoamericana de Derecho Social     Open Access   (Followers: 1, SJR: 0.101, CiteScore: 0)
Revista Latinoamericana de Desarrollo Económico     Open Access  
Revista Latinoamericana de Educación Inclusiva     Open Access   (Followers: 1)
Revista Latinoamericana de Filosofía     Open Access   (Followers: 1)
Revista Latinoamericana de Hipertension     Open Access   (SJR: 0.158, CiteScore: 0)
Revista Latinoamericana de Investigación en Matemática Educativa     Open Access   (SJR: 0.171, CiteScore: 0)
Revista Latinoamericana de Psicopatologia Fundamental     Open Access   (SJR: 0.201, CiteScore: 0)
Revista Medica de Chile     Open Access   (SJR: 0.259, CiteScore: 1)
Revista Médica del Hospital Nacional de Niños Dr. Carlos Sáenz Herrera     Open Access   (Followers: 1)
Revista Médica del Uruguay     Open Access  
Revista Médica Electrónica     Open Access  
Revista Médica La Paz     Open Access  
Revista Médico-Científica : Luz y Vida     Open Access  
Revista Mexicana de Análisis de la Conducta     Open Access   (SJR: 0.405, CiteScore: 1)
Revista Mexicana de Astronomía y Astrofísica     Open Access   (Followers: 2, SJR: 0.596, CiteScore: 1)
Revista Mexicana de Biodiversidad     Open Access   (SJR: 0.421, CiteScore: 1)
Revista Mexicana de Ciencias Agrícolas     Open Access   (Followers: 1)
Revista Mexicana de Ciencias Farmaceuticas     Open Access   (Followers: 1)
Revista Mexicana de Ciencias Geológicas     Open Access   (SJR: 0.308, CiteScore: 1)
Revista Mexicana de Ciencias Pecuarias     Open Access   (Followers: 1, SJR: 0.17, CiteScore: 0)
Revista Mexicana de Economía y Finanzas     Open Access  
Revista Mexicana de Física     Open Access   (SJR: 0.203, CiteScore: 0)
Revista mexicana de física E     Open Access  
Revista Mexicana de Fitopatología     Open Access  
Revista Mexicana de Ingeniería Biomédica     Open Access   (Followers: 1)
Revista Mexicana de Ingeniería Química     Open Access   (SJR: 0.328, CiteScore: 1)
Revista Mexicana de Investigación Educativa     Open Access   (Followers: 3, SJR: 0.291, CiteScore: 0)
Revista Mexicana de Micologí­a     Open Access  
Revista Mexicana de Sociologí­a     Open Access   (Followers: 9, SJR: 0.142, CiteScore: 0)
Revista Musical Chilena     Open Access   (SJR: 0.1, CiteScore: 0)
Revista MVZ Córdoba     Open Access   (SJR: 0.173, CiteScore: 0)

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Revista de la Ciencia del Suelo y Nutricion Vegetal
Journal Prestige (SJR): 0.224
Number of Followers: 1  

  This is an Open Access Journal Open Access journal
ISSN (Print) 0717-635X - ISSN (Online) 0718-2791
Published by SciELO Homepage  [911 journals]
  • SOIL GLYCOSIDASE ACTIVITIES AND WATER SOLUBLE ORGANIC CARBON UNDER
           DIFFERENT LAND USE TYPES

    • Abstract: The purpose of this study was to measure the effects of different land uses on soil glycosidase activities (a- and (β-glucosidase, α- and (β-galactosidase), water soluble organic carbon (WSOC) and their relationships. Glycosidase activities showed significant differences under different land use types, the highest one was woodland. (β-glucosidase had the highest activity among the four glycosidases. The activities of these glycosidases decreased with increasing soil depth, being all significantly affected by change of soil depth. Except grassland, the four glycosidase activities intercorrelated each other. Woodland had the highest content of WSOC in the soil depth of 0-20 cm and at increasing soil depth, WSOC content decreased sharply under woodland and grassland. Glycosidase activities had positive and significant relationships with WSOC. Glycosidase activities and WSOC all had significant correlations with soil total organic carbon (TOC) and pH, which were sensitive to different land use types. We found that glycosidase activity indirectly impacts on nutrient recycling and energy flow in soil under different land use types.
       
  • EFECTOS DEL ENCALADO Y LA FERTILIZACIÓN NITROGENADA SOBRE EL DESARROLLO
           DE Oenothera affinis EN UN SUELO AFECTADO POR LA MINERÍA DEL COBRE

    • Abstract: The Puchuncaví valley (central Chile) has been exposed to aerial emissions from the Ventanas copper smelter. Nowadays, soils in the surroundings are sparsely-vegetated, acidic, nitrogen-deficient, and metal-contaminated. Their remediation is needed to reduce environmental risks. Phytostabilization considers the use of plants which are able to store metals in underground tissues, thus reducing their movement from contaminated soils to the air and water. The success of the treatment depends on application of suitable amendments in order to both limit metal solubility in soils and improve soil conditions for the plant development. We evaluated the effects of liming and nitrogen fertilization on cotyledon emergence, plant survival, biomass production and copper accumulation of Oenothera affinis grown in a soil from the Puchuncaví valley, under controlled conditions. Oenothera affinis is a native Chilean perennial herb, it is drought resistant, it is easy to propagate from seeds, and it produces a large biomass. The soil exhibited pH in salt extract of 4.6 and total copper concentration of 800 mg kg-1. Liming decreased Cu concentrations and Cu2+ activity in the soil solution, but did not affect cotyledon emergence. None of the plants survived in non-limed soils, while plant survival was 100% in the soils with near neutral pH. On the other hand, in limed soils, nitrogen fertilization did not affect biomass production and increased copper concentrations in both roots and shoots. It was concluded that liming is sufficient to improve soil conditions for development of O. affinis in acidic and metal-contaminated soils, allowing by this mean potential utilization of this species for phytostabilization.El valle de Puchuncaví (Chile central) ha sido expuesto a las emisiones aéreas provenientes de la fundición de cobre Ventanas. Actualmente, los suelos en las cercanías de la fundición presentan una escasa vegetación, son ácidos, deficientes en nitrógeno y contaminados con metales. Para reducir el riesgo ambiental, es necesario remediar estos suelos. La fitoestabilización considera el uso de plantas capaces de almacenar los metales en sus estructuras subterráneas, reduciendo así su movimiento desde el suelo contaminado al aire y al agua. El éxito del tratamiento depende de la aplicación de enmiendas adecuadas que reducen la solubilidad de los metales en los suelos y, a la vez, mejoran sus condiciones para el desarrollo de la planta. Se evaluó el efecto del encalado y la fertilización nitrogenada sobre la emergencia de cotiledones, supervivencia, producción de biomasa y acumulación de cobre en Oenothera affinis cultivada en un suelo del valle de Puchuncaví bajo condiciones controladas. Oenothera affinis es una hierba perenne nativa, resistente a la sequía, fácil de propagar a partir de semillas y que produce una gran cantidad de biomasa. Los suelos presentaron un pH en sal de 4,6 y una concentración de cobre total de 800 mg kg-1. El encalado disminuyó las concentraciones de Cu y la actividad del Cu+2 en la solución del suelo, pero no afectó la emergencia de cotiledones. Las plantas no sobrevivieron en los suelos no-encalados, mientras que la supervivencia fue del 100% en los suelos con un pH cercano al neutro. Por otro lado, en los suelos encalados, la fertilización nitrogenada no afectó la producción de biomasa y aumentó las concentraciones de cobre tanto en las raíces como en los tejidos aéreos. Se concluyó que el encalado es suficiente para mejorar las condiciones del suelo para el desarrollo de O. affinis en suelos ácidos y contaminados por metales, permitiendo así la potencial utilización de esta especie para la fitoestabilización.
       
  • RELATIONSHIP BETWEEN RADICAL INFESTATION OF Hylastinus obscurus (MARSHAM)
           AND THE YIELD OF CULTIVARS AND EXPERIMENTAL LINES OF RED CLOVER (Trifolium
           pratense L.)

    • Abstract: Red clover (Trifolium pratense L.) is a valuable forage legume grown alone or in mixture with grasses in temperate regions of the world. Red clover is adapted to a wide range of soil types, pH levels, environmental and management conditions. However, the main limitation of this species is the lack of persistence related to the high mortality of plants. In Chile the main biotic factor affecting survival of plants is the root borer Hylastinus obscurus (Marsham) (Coleóptera; Scolytidae). In 1989, a red clover (T. pratense L.) breeding program was started at Carillanca Research Center of the Institute of Agricultural Research (INIA), Chile, with the main objectives of improving the survival of plants, forage yield and persistence. In 2002 a research line to study the interaction between the root borer and the plant was started. This paper describes briefly the improvement obtained in survival of young plants after twenty years of breeding and the importance of root borer population regarding forage yield. Experiments were conducted at Carillanca Research Center under irrigated conditions, comparing under cutting the dry matter yield of new synthetic lines and Redqueli-INIA with Quinequeli-INIA. The experimental lines Syn Int IV, Syn Pre III, Syn Int V and Syn Int VI were more productive than the cultivars Redqueli-INIA and Quiñequeli-INIA at the second season. The evaluation of the biological parameter allowed identifying a tolerant line, Syn Pre I, and three potential new varieties: Syn Pre III, Syn Int V and Syn Int VI. This is the first report showing an inverse relation between dry matter yield of red clover and root borer population (P
       
  • BIOCHEMICAL PROPERTIES IN VASCULAR EPIPHYTES SUBSTRATE FROM A TEMPERATE
           FOREST OF CHILE

    • Abstract: The temperate forests of south-central Chile belong to the association Lapageria aextoxiconetum Oberdorfer vegetation, dominated by Aextoxicon punctatum R. et P., elderly and multi-layered, where the strata are emergent, dominant and co-dominant, shrub and herbaceous epiphytes. This work is the first report of measurements of some biochemical properties in samples from vascular epiphytes substrate in temperate forests. We evaluated the most frequent ecological situations: bifurcated trees (BT), dead standing trees (SDT) and medium gap border trees (MGBT), ES were compared with the surrounding soil forest land (SS) as control. The microbial biomass and enzyme activities of substrate were higher in ES of BT, situation probably due to optimal micro-environmental conditions (moisture and humidity, temperature, organic matter (OM) content and nutrient availability); similarly, lower levels of activity were found in ES in MGBT situation. We found a statistically significant correlation (P≤0.05) between evaluated microbial biomass and enzymatic activities. Furthermore, the biochemical properties were influenced by factors such as moisture, temperature, pH and OM content and all of these factors correlated significantly (P≤0.01) among them. These results demonstrate a difference between ES and SS in BT that should be explored to gain insights in understanding the processes of decomposition using the natural microcosms that ES provides.
       
  • GROWTH OF Inga vera WILLD. SUBSP. Affinis UNDER
           RIZOBIA INOCULATION

    • Abstract: Nitrogen, in general, is the largest limiting plant growth nutrient in the tropics and is required as a synthetic fertilizer to improve plants productivity. Therefore, studies aiming in understanding and using nitrogen fixation by leguminous trees have been done as a low-cost alternative for chemical fertilizer. Native legume trees such as Inga vera have been recommended in the rehabilitation of degraded areas due their ability to establish symbiosis with nitrogen fixation organisms replacing nitrogen fertilization. These species are able to increase soil organic matter, nitrogen and phosphorus availability. Thus, the present study aims to assess the inoculation effects of native rhizobia strains on nodulation, dry matter production, nitrogen and phosphorus leaf incorporation in I. vera seedlings. With this purpose, four strains were obtained from inga nodules and tested in a greenhouse. The inoculation of I, vera seedlings with native rhizobium strains promoted an increase in shoot dry mass as well as in leaf nitrogen content. According to symbiotic efficiency equation, this approach ranged from 50 to 80% indicating that the nitrogen fertilization for this species can be partially replaced by rhizobia inoculation.
       
  • SOIL NUTRIENT CONTENTS AND ENZYMATIC CHARACTERISTICS AS AFFECTED BY 7-YEAR
           NO TILLAGE UNDER MAIZE CROPPING IN A MEADOW BROWN SOIL

    • Abstract: No tillage is being populanzed for the rainfed maize production in Northeast China. In order to evalúate its effects on the nutrient contents and enzymatic charactenstics in upland soils of Northeast China, surface (0-20 cm) meadow brown soil samples were collected from the plots under no tillage and conventional tillage in a 7-year field experiment under maize cropping in Shenyang, with the soil pH, contents of total C, N, P and S and available N, activities of α- and (β-galactosidase, α- and (β-glucosidase, urease, protease, phosphomonoesterase, phosphodiesterase, and arylsulphatase, and kinetic parameters of (β-glucosidase, protease, phosphomonoesterase, phosphodiesterase, and arylsulphatase determined. Comparing with conventional tillage, no tillage increased the contents of soil total C, N, and S and available N, the activities of test enzymes, and the Vmax/Km of soil urease, protease, and phosphomonoesterase, but decreased the activity of soil α-galactosidase and the VmaxKm of soil (β-glucosidase significantly. All the results suggest that long term no tillage for the maize production on meadow brown soil of Northeast China could enhance soil nutrients storage and the turnover of soil N and P, but had definite negative effects on the transformation of soil C.
       
  • EFFECT OF LIQUID COW MANURE ON CHEMICAL AND BIOLOGICAL PROPERTIES
           IN AN ANDISOL

    • Abstract: The aim of this work was to establish the effect of the dose of liquid cow manure (LCM) on some chemical properties and biological activity in an Andisol. This study was carried out under laboratory conditions using an Andisol and LCM from a dairy farm located in the South of Chile. The dose of LCM were the equivalent to 0 (SO), 100 (S100), 200, (S200) and 300 (S300) thousand L ha-1. This amount is equivalent to regular agronomic LCM applications. The chemical characterization indicated that the LCM addition modified all the tested Andisol chemical properties. These begin to return to the initial conditions from 10 days on, with the exception of EC, K and DOC. The C-C0(2) evolution indicated that LCM incorporation at increasing dose enhanced the respiratory activity. Enzyme activity was greater in the amended soils than in SO. The results of this study indicated that the period of time necessary for the LCM amended soils returning to a similar behavior to SO is more than 10 days, with a strong correlation between the chemical properties of the amended soils and their biological activity, mainly C-C0(2) evolution.
       
  • NITROGEN SOIL BUDGETS IN CONTRASTING DAIRY GRAZING SYSTEMS OF SOUTHERN
           CHILE, A SHORT-TERM STUDY

    • Abstract: In recent years, the intensification of livestock production in Southern Chile has resulted in a high potential for environmental damage through nitrogen (N) losses, creating the need for the evaluation of N flows from these systems. The aim of the research was to determine N budgets and N use efficiency in two grazing systems in Southern Chile. For this, inputs and outputs were measured during one year on two grazing systems (heavy grazing, HG; and light grazing, LG). Also, a control treatment with no grazing (C) was considered. The annual N soil budget was determined by the difference between all N inputs (£ inputs) and all N outputs (X outputs). The results of the experiment indicate that HG treatments received the biggest N input (427, 359 and 288 kg N ha-1 yr-1 for HG, LG and C treatment, respectively), however this treatment also had the biggest N losses (406 kg N ha-1 yr-1), with a nitrogen recovery efficiency from fertilizer of 71%. In addition, herbage dry matter yield (DM) was greater in the HG than in the LG and C treatments (10.4; 8.1 and 7.1 t N ha-1 yr-1, respectively). Also, N concentration in the forage was higher in this treatment (2.9%) than in the LG (2.7%) and C (2.5%) treatments. The results indicate that HG increases N use efficiency in pastures in Southern Chile, increasing the herbage production and quality, but also increasing the potential for N losses to the wider environment. Farmers should consider this when choosing the appropriate grazing system.
       
 
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