Investigacion Agraria最新文献

{"title":"Diversidade e fitossociologia de fragmentos de floresta com Araucária em pequenas propriedades rurais no Estado do Paraná - Brasil","authors":"Emílio Carlos Zilli Ruiz, C. Mussio, Milayne Lopes Rickli, Carlos Henrique Boscardin Nauiack, A. F. Filho","doi":"10.18004/INVESTIG.AGRAR.2019.DICIEMBRE.81-92","DOIUrl":"https://doi.org/10.18004/INVESTIG.AGRAR.2019.DICIEMBRE.81-92","url":null,"abstract":"espanolEl objetivo de esta investigacion fue analizar las caracteristicas floristicas de seis fragmentos de Bosque Ombrofilo Mixto ubicado en pequenas propiedades rurales ubicadas en Fernandes Pinheiro y compararlas en relacion con la diversidad alfa y beta. Se utilizaron 26 parcelas de 2.000 m², divididas en 130 subparcelas de 400 m² distribuidas en seis pequenos fragmentos de bosque. Se determinaron los parametros fitosociologicos y los indices de Shannon, Simpson y Pielou de cada fragmento, ademas del coeficiente Jaccard para formar grupos con un 50% de similitud. Los indices de Shannon de los fragmentos se evaluaron uno por uno utilizando la prueba de Hutcheson. En total, se registraron 103 especies de 69 generos y 35 familias, las familias mas abundantes son Myrtaceae y Lauraceae. De los seis fragmentos analizados, Araucaria no fue la especie principal solo en el Fragmento 6, la mas no caracterizada. El fragmento 3, aunque es el mas pequeno, presento los mejores resultados para la biodiversidad (S = 64 y H ’= 3,390). La prueba de Hutcheson enfatizo que los Fragmentos 3 y 6 difieren de los demas, de la misma manera, el coeficiente Jaccard tambien mostro menos similitud floristica entre estos dos fragmentos en relacion con los otros. Se concluyo que existe una alta heterogeneidad entre pequenos fragmentos de bosque cercanos, ademas de mostrar la disparidad en relacion con los grandes remanentes. portuguesO objetivo desta pesquisa foi analisar as caracteristicas floristicas de seis fragmentos de Floresta Ombrofila Mista situados em pequenas propriedades rurais localizadas em Fernandes Pinheiro e compara-los em relacao a diversidade alfa e beta. Utilizaram-se 26 parcelas de 2.000 m² divididas em 130 subparcelas de 400 m² distribuidas em seis pequenos fragmentos florestais. Os parâmetros fitossociologicos e indices de Shannon, Simpson e Pielou de cada fragmento, alem do Coeficiente de Jaccard para formacao de grupos a 50% de similaridade foram determinados. Os indices de Shannon dos fragmentos foram avaliados um a um pelo Teste de Hutcheson. No total, foram registradas 103 especies de 69 generos e 35 familias, sendo as familias mais abundantes, Myrtaceae e Lauraceae. Dos seis fragmentos analisados, a Araucaria nao foi a principal especie apenas no Fragmento 6, o mais descaracterizado. O Fragmento 3, mesmo sendo o menor, apresentou os melhores resultados para biodiversidade (S = 64 e H’ = 3,390). O Teste de Hutcheson enfatizou que os Fragmentos 3 e 6 diferem dos demais, da mesma forma, o coeficiente de Jaccard tambem evidenciou menor similaridade floristica entre esses dois fragmentos em relacao aos demais. Concluiu-se que ha elevada heterogeneidade entre pequenos fragmentos florestais proximos, alem de evidenciar a disparidade em relacao a grandes remanescentes. EnglishThe objective of this research was to analyze the floristic characteristics of six fragments of Mixed Ombrophylous Forest located in small rural properties located in Fernandes Pin","PeriodicalId":52991,"journal":{"name":"Investigacion Agraria","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43976358","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Estimativa da Curva de Kuznets ambiental para o Estado de Mato Grosso do Sul","authors":"Ángel Manuel Carrión Rodríguez, Rayan Wolf, Dayane Freitas de Medeiros, Erly Cardoso Teixeira","doi":"10.18004/INVESTIG.AGRAR.2019.DICIEMBRE.124-135","DOIUrl":"https://doi.org/10.18004/INVESTIG.AGRAR.2019.DICIEMBRE.124-135","url":null,"abstract":"The Environmental Kuznets Curve (EKC) considers that some measures of environmental degradation would increase in the early stages of economic growth and, upon reaching a certain level of income, degradation would decrease. In view of the environmental impacts that the state of Mato Grosso do Sul has suffered, this article aims to investigate the hypothesis of the Environmental Kuznets Curve for the state, trying to identify the relationship between deforestation and economic growth. For this, data from 2008 were used, using a spatial econometric methodology, with self-spatial correlation indexes. The results indicated that there is no evidence that the Environmental Kuznets Curve has been inverted for the state, explained by the fact that the curve is in its initial stage, since the MS state economy is extremely dependent on the agricultural sector and having characteristics of an economy still in development, still in the initial stage of the Kuznets Environmental Curve.","PeriodicalId":52991,"journal":{"name":"Investigacion Agraria","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41798605","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Phenological aspects and productivity of summer species for soil coverage in Vacaria, RS","authors":"Ernane Ervino Pfüller, Douglas Bueno Santos, Rogério Ferreira Aires, Maria del Pilar Galeano Samaniego","doi":"10.18004/INVESTIG.AGRAR.2019.JUNIO.23-30","DOIUrl":"https://doi.org/10.18004/INVESTIG.AGRAR.2019.JUNIO.23-30","url":null,"abstract":"","PeriodicalId":52991,"journal":{"name":"Investigacion Agraria","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45621619","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Paraguay´s export to MERCOSUR. Sub heading threatened by de UE-MERCOSUR trade agreement","authors":"V. Cano, M. Quero","doi":"10.18004/INVESTIG.AGRAR.2019.JUNIO.43-53","DOIUrl":"https://doi.org/10.18004/INVESTIG.AGRAR.2019.JUNIO.43-53","url":null,"abstract":"The impact of the EU-MERCOSUR Regional Association Agreement, which has been under negotiation since 2000, has been widely studied with an emphasis on Brazil and Argentina, before Paraguay and Uruguay. Models that provide aggregate results and not products as negotiated have been used. Taking these into consideration the research focused on Paraguay with the objective of identifying products exported by this country to MERCOSUR, which could be substituted by similar ones from the EU, once the Agreement is implemented. The identification was made at the level of sub headings of the Harmonized Commodity Description and Coding Systems (HS) usingtrade indicators.The data used was the trade average from 2010-2012, the most updated at the time the study started.Trade data were from the World Bank database known as WITS (World Integrated Trade Solutions), and MERCOSUR ́s tariff data from the Common External Tariff website. The most threatened sub headings of being replaced or displaced from MERCOSUR had a low weight in Paraguayan exports. However, for several products, MERCOSUR was the only or the most important market. The disaggregation by categories facilitated identifying the threatened products and quantifying the importance of the regional market for them. Most products with substitution threats were manufactures. These results lead to the conclusion that the Agreement will negatively affect mainly the manufacturing industry in Paraguay.","PeriodicalId":52991,"journal":{"name":"Investigacion Agraria","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48675762","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Flowering, fructification and seed production in plants of Polystachya concreta (Jacq.) Garay y H.R. Sweet (Orquidaceae)","authors":"V. H. Lallana, A. Michel, L. F. García","doi":"10.18004/INVESTIG.AGRAR.2019.JUNIO.65-72","DOIUrl":"https://doi.org/10.18004/INVESTIG.AGRAR.2019.JUNIO.65-72","url":null,"abstract":"","PeriodicalId":52991,"journal":{"name":"Investigacion Agraria","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48811216","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"SIG delimitation of an area of the ecoregion Humid Chaco to the right bank of the Paraguay river","authors":"J. I. Encinas, R. C. Nóbrega, J. Woo, Natália Oliveira Ramos","doi":"10.18004/INVESTIG.AGRAR.2019.JUNIO.54-64","DOIUrl":"https://doi.org/10.18004/INVESTIG.AGRAR.2019.JUNIO.54-64","url":null,"abstract":"","PeriodicalId":52991,"journal":{"name":"Investigacion Agraria","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46407194","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Surface designs to determine the levels of N and P that maximize yield of tomato","authors":"Alex Lázaro Tineo Bermúdez, Pepe Ayala Prado, C. Carranza","doi":"10.18004/INVESTIG.AGRAR.2019.JUNIO.31-42","DOIUrl":"https://doi.org/10.18004/INVESTIG.AGRAR.2019.JUNIO.31-42","url":null,"abstract":"The methodology of response surfaces, originally introduced by Box and Hunter in 1951, has allowed the development of several designs, such as the San Cristóbal Design developed by Rojas in 1962, for research with fertilizers (Chacín, 1998). In order to determine the influence of the application of levels (0 to 360 kg ha) of N and P2O5 on the tomato yield and the similarity of the surface models, estimated by response surface designs, the present research in environments of the National University of San Cristóbal de Huamanga (UNSCH), in Ayacucho, Peru. Tomato was cultivated in a protected environment, using four surface designs (Central Composite Design Rotable: DCCR, Design San Cristóbal: DSC, Design July 3: D3J and Complete Factorial: DFC). The results show that the yields of tomato fruits obey the models: Y = 12292 + 104.77794*N + 87.27649*P2O5 0.12524*N2 0.13156*P2O52 0.05242*N*P2O5 (DCCR); Y = 13121 + 102.98407*N + 51.88371*P2O5 0.14659*N2 0.02645*P2O52 + 0.00512*N*P2O5 (D3J); Y = 13255 + 120.28556*N + 97.79306*P2O5 0.24539*N2 0.16289*P2O52 + 0.07365*N*P2O5 (DSC); Y = 11401 + 103.54156*N + 83.1667*P2O5 0.17911*N2 0.14172*P2O52 + 0.0747*N*P2O5 (DFC). It is concluded that: 1. N (urea) has a greater influence than P2O5 (triple superphosphate) on the yield of tomato fruits; 2. There is greater similarity between the estimated values corresponding to the DCCR and D3J designs, with those of the DFC, showing better results at average levels of N and P2O5 (180 kg ha).","PeriodicalId":52991,"journal":{"name":"Investigacion Agraria","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67547745","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Capacity of a terrestrial optical sensor as a tool to detect nitrogen deficiency in cotton crop por cultivation","authors":"J. Bonnin, Rubén Franco Ibars, Pedro Aníbal Vera Ojeda, J. Avalos","doi":"10.18004/INVESTIG.AGRAR.2019.JUNIO.11-22","DOIUrl":"https://doi.org/10.18004/INVESTIG.AGRAR.2019.JUNIO.11-22","url":null,"abstract":"The objective of the present investigation was to evaluate the effect of the nitrogen dose variation (N) on the reflectance properties of the cotton por culture, through an optical sensor. The research was conducted in the experimental field of the FCA/UNA. Subsidiary Santa Rosa, Misiones. The cotton cultivars evaluated were IAN-425 and IPTA-212. The doses of N used were 0, 50, 100, 150, 200 and 250 kg ha, in the form of urea, with an experimental design of random blocks in divided plots, where the main plots were the cultivars and the subplots by the dose of N. The results were subjected to a comparison of means (Tukey p<0.05). The NDVI values obtained by the sensor were significantly influenced (p<0.05) as a function of the N doses applied to the plant, based on the evaluations made at 76 DDE, regardless of the type of cultivar, where they were recorded. the highest spectral values (0.85 and 0.84) with the N dose of 250 kg ha. In spite of not detecting significant differences between the cultivars, neither in the doses of nitrogen applied to the plants, as well as in the interaction of the studied factors (Cultivar x Dosage) in the yield of fiber in branch, we can emphasize that the average yield of the cultivar IAN-425 was 3,143.17 kg ha and in turn, the cultivar IPTA-212 obtained an average yield of 3,036.91 kg ha, results that far exceed the national average yield of 1,180 kg ha for the harvest 2015/2016.","PeriodicalId":52991,"journal":{"name":"Investigacion Agraria","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43057692","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of different osmotic potentials using polyethylene glycol on the germination and growth of seedlings of three varieties of soybean","authors":"María Lezcano, Victor Rodolfo Almada Vera, Luis Roberto González Segnana, Ulises Riveros Insfrán","doi":"10.18004/INVESTIG.AGRAR.2019.JUNIO.73-80","DOIUrl":"https://doi.org/10.18004/INVESTIG.AGRAR.2019.JUNIO.73-80","url":null,"abstract":"One of the main problems in agricultural production is the variation in the amount and distribution of rainfall, resulting in periods of drought affecting crop production and sustainability. The aim of this study was to evaluate the germination and growth of three soybean varieties in different osmotic potentials obtained with polyethylene glycol. The experiment was performedat the Laboratory ofAnalysis and Quality of Seeds, Faculty of Agrarian Sciences of the National University of Asunción. Three soybean varieties were studied (RA-626, FCEP-55 and A-5543) exposed to five osmotic levels (0,0;-0,2;-0,4;0,6 y -0,8 MPa), deduced from the formula Michell and Kaufman. The variables analyzed were: percentage of germination, height of the plants and dry matter, and tolerance under water stress conditions. The design used was completely random with a factorial arrangement. The treatments will be randomized complete factorial arrangement. The data were analyzed through analysis of variance and by the Duncan test at 5%. The results showed that the decrease in the osmotic potential induced by PEG6000, is negative in the simulation of drought in soybean seeds. The osmotic potential of 0.60MPa induced by PEG 6000 prevents germination and vigor of soybean seeds. It is concluded that variety A-5543 showed the greatest tolerance under water stress conditions under study.","PeriodicalId":52991,"journal":{"name":"Investigacion Agraria","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46138428","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Fertilization with pig slurry: impacts on earthworms in rainfed agriculture","authors":"Alcira S. Valdez-Ibañez, À. D. Bosch-Serra, M. R. Yagüe-Carrasco","doi":"10.18004/INVESTIG.AGRAR.2019.JUNIO.1-10","DOIUrl":"https://doi.org/10.18004/INVESTIG.AGRAR.2019.JUNIO.1-10","url":null,"abstract":"Earthworms play an important role in the maintenance of soil ecosystem services. Their presence and activity are influenced by agricultural practices as fertilization. The objective of this research was to identify earthworm species and to quantify their abundance and biomass in a field experiment where different fertilization strategies were applied for a period of 12 years. The experiment was carried out under a semiarid Mediterranean climate, in a fallow year of a rainfed cereal system. Fertilization strategies were based on pig slurries from fattening pigs (PE) and from sows (PM) at different fresh doses distributed in six treatments: three treatments only included PE (one rate was 30 t ha−1 yr−1 applied at pre-sowing, and the other two treatments received 40 and 60 t ha−1 yr−1 applied at cereal tillering), two treatments only included PM (60 and 90 t ha−1 yr−1 applied at cereal tillering) and the last, it combined PE and PM (30 t ha−1 yr−1 of PE at pre-sowing plus 90 t ha−1 yr−1 of PM at cereal tillering). Fertilization included a mineral fertilization treatment (0−FM) acting as a control. There were no variations in the abundance and biomass of earthworms registered according to the type of fertilization. Two earthworm species were identified. The endogeic species Koinodrilus roseus was the most abundant (80%−100%). The anecic species Nicodrilus trapezoides was not detected in plots receiving the two highest doses of PE at cereal tillering. The absence of N. trapezoides can be considered as a bioindicator of PE over-fertilization.","PeriodicalId":52991,"journal":{"name":"Investigacion Agraria","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67547703","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}