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| Registros recuperados: 443 | |
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| Lemes,Elisa S; Tunes,Lilian M. de; Almeida,Andreia da S; Meneghello,Geri E; Oliveira,Sandro de; Muniz,Marlove F. B. |
| Seed coating is among the most potentially beneficial treatments to enhance seed performance, contributing to the improvement of crop stands due to its role in improved seedling development. Thus, micronutrients such as zinc exhibit potential for use in seed coatings. The objective of this research is to evaluate the effect of coating wheat seeds with zinc sulfate on traits that are related to seed quality during storage and nutrition efficiency during seedling growth. The levels of ZnSO4 used were 0, 1, 2, 3 and 4 mL kg-1 seed. After 0,3 and 6 months of storage, the germination percentage, mean root length, root dry mass, seedling emergence, nutritional efficiency (absorption, transport and use) and zinc content in the seeds were evaluated. Seed coating... |
| Tipo: Journal article |
Palavras-chave: Seed vigor; Triticum aestivum L; Zinc coating. |
| Ano: 2015 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202015000100011 |
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| Petitpas,Robert; Ibarra,José Tomás; Miranda,Marcelo; Bonacic,Cristián. |
| R. Petitpas, J.T. Ibarra, M. Miranda, and C. Bonacic. 2016. Spatial patterns in a 24-year period show a case of increase forest cover and decrease fragmentation in Andean temperate landscapes, Chile. Cien. Inv. Agr. 43(3):384-395. Changes in landscape pattern were studied in a temperate landscape of the La Araucanía Region, Chile. Using aerial photographs from 1983 and 2007, we created land use/land cover maps. We then quantified the changes in composition and configuration by using landscape metrics and an adjacency matrix. By 2007, the dominant land cover had changed from agriculture to native vegetation. Residential areas showed the largest relative increase (670%) and had significant adjacency with native vegetation. The native vegetation increased by... |
| Tipo: Journal article |
Palavras-chave: Fragmentation; Landscape change; Native vegetation recovery; Temperate forest. |
| Ano: 2016 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202016000300004 |
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| Gastó,Juan; Vera,Leonardo; Vieli,Lorena; Montalba,Rene. |
| This work is the product of a long process that tried to approximate the principia involved in sustainable agriculture in an attempt to analyze it. We believe that these principia are crucial for the systematic, rigorous, and consistent development of sustainable agriculture. The unifying concepts of agriculture sustainability are classified into seven fundamental principies: (i) there is a hierarchy in decision-making with respect to human actions on the landscape and environment; (ii) human impact on the land should be analyzed from different perspectives (local, global, anthropocentric, and ecocentric); (iii) the carrying capacity in an agrarian context is crucial to ecosystem management and design; (iv) humans arrange nature with little consideration... |
| Tipo: Journal article |
Palavras-chave: Agriculture; Cultural landscape; Nature; Territory; Sustainability. |
| Ano: 2009 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202009000100001 |
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| Moya-Elizondo,Ernesto A. |
| E.A. Moya-Elizondo. 2013. Fusarium crown rot disease: biology, interactions, management and function as a possible sensor of global climate change. Cien. Inv. Agr. 40(2):235-252. Wheat crops are commonly affected by the dryland root rot complex (DLRRC) under dry and semiarid conditions. This complex is associated with seedling blight, and rotting of roots, crowns and stems of wheat plants. Several pathogens are associated with this complex, but Fusarium crown rot disease (FCR) is the most common and is of worldwide importance. Increased drought frequency and changes in rainfall regimes associated with global climate change may increase the prevalence of this complex of diseases, especially of FCR, in wheat crop areas. This review discusses the... |
| Tipo: Journal article |
Palavras-chave: Fusarium crown rot; Wheat; Climatic change. |
| Ano: 2013 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202013000200001 |
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| Arnhold,Emmanuel; Soriano Viana,José Marcelo; Mora,Freddy; Vieira Miranda,Glauco; Gonçalves Silva,Ricardo. |
| The aim of the study was to assess inbreeding depression and determine genetic components in landrace populations of popcorn. Six Brazilian popcorn landraces: Amarelo, Beija-Flor, Branco, Rosa-claro, Roxo and Viçosa, were subjected to self-pollination. Experiments with SO populations and their selfing populations (SI) were conducted in a randomized complete block design. The estimates of inbreeding depression varied from 1.2% (popping expansion) to 79% (grain yield). The gene action was predominantly additive for plant height, ear height and hundred-grain-weight. The dominance genetic effects were important for index of prolificacy and grain yield. The genetic effect of popping expansion was bidirectional with nuil dominance and a predominance of additive... |
| Tipo: Journal article |
Palavras-chave: Zea mays L; Mprovement; Popping expansion; Popcorn; Genetic variance. |
| Ano: 2010 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202010000300011 |
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| Carvalho,Janaina M. G; Bonfim-Silva,Edna M; Araújo da Silva,Tonny J.; Sousa,Helon H.F; Guimarães,Salomão L; Pacheco,Adriano B. |
| J. M. G. Carvalho, E.M. Bonfim-Silva, T.J.A. Silva, Helon H.F. Sousa, S.L. Guimarães, and A.B. Pacheco. 2016. Nitrogen and potassium in production, nutrition and water use efficiency in wheat plants. Cien. Inv. Agr. 43(3):442-451. Wheat (Triticum aestivum L.) is a cereal used in food and feed for its nutritional properties. For nitrogen and potassium management, efficient use of water is required for greater availability and transportation of these nutrients. The objective of this study was to evaluate the effect of combinations of nitrogen and potassium doses in production, nutrition and water use efficiency in wheat. The experiment was held in a greenhouse with 8-dm³ pots using Oxisol collected at a depth of 0-0.2 m under Cerrado vegetation. Base... |
| Tipo: Journal article |
Palavras-chave: Nitrogen potassium ratio; Production characteristics; Triticum aestivum. |
| Ano: 2016 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202016000300010 |
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| Zavala,Andrea; Elgueta,Mario; Abarzúa,Juan; Aguilera,Alfonso; Quiroz,Andrés; Rebolledo,Ramón. |
| The Araucanía region is a berry producing area where important behavioral aspects of species in the genus Aegorhinus, a pest that affects crops, are still unknown. The objectives of this study were to determine the distribution, abundance and richness of these species in agroecological zones of La Araucanía Region and to determine the hosts in which they were found. The sites where these species were found were represented on a map divided into grids of 25 x 25 km. Eight species of Aegorhinus were found in the area, and Aegorhinus nodipennis and Aegorhinus superciliosus were the most abundant. The diversity was analyzed using the Shannon-Wiener index, and the equitability was determined using the Pielou index. The agroecological zone with the greatest... |
| Tipo: Journal article |
Palavras-chave: Aegorhinus; Agroecological zones; Coleoptera; Hosts. |
| Ano: 2011 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202011000300006 |
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| Villegas,Cinthya M; Verdugo,Jaime A; Grez,Audrey A; Tapia,Jaime; Lavandero,Blas. |
| C.M. Villegas, J.A. Verdugo, A.A. Grez, J. Tapia, and B. Lavandero. 2013. Movement between crops and weeds: temporal refuges for aphidophagous insects in Central Chile. Cien. Inv. Agr. 40(2): 317-326. Crop edges have significant effects on populations of natural enemies, acting as source or sink habitats during the growing season. Previous observations have shown that coccinellid species are associated with thistle (Sylibum marianum (L.) Gaertn), a common exotic weed in the central valley of Chile. To determine whether thistles growing at crop edges act as a putative refuge for natural enemies, the seasonal relative abundance of aphidophagous coccinellids was estimated at 0, 10 and 25 m from the edges of three alfalfa fields. Mark-recapture studies were... |
| Tipo: Journal article |
Palavras-chave: Alfalfa; Coccinellids; Refuges; Rubidium; Thistle. |
| Ano: 2013 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202013000200007 |
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| Arismendi,Nolberto; Böhm,Laura. |
| Extracts of many plant species have shown nematicide activity attributable to phytochemicals present in their tissues or formed during a degradation process. Nevertheless, before the application of plant compounds in the field, it is necessary to know their effect on plant hosts. Three concentrations (1, 2.5 and 5% w/w) of dry leaves of Buddleja globosa, Drymis winteri, Eucalyptus globulus, Gevuina avellana, Laurelia sempervirens and Ugni molinae were evaluated on growth parameters (plant height, root length and leaf dry matter) in plants of Lactuca sativa infested with Meloidogyne hapla. Lettuce growth parameters were significantly affected by the interaction between the species and dry leaf tissues concentrations. Drymis winteri showed the biggest... |
| Tipo: Journal article |
Palavras-chave: Forestry species; Lactuca sativa; Meloidogyne hapla; Organic amendment; Root-knot nematodes. |
| Ano: 2011 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202011000100007 |
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| Pérez,Delfina de J; González,Andrés; Sahagún,Jaime; Vázquez,Luis M; Rivera,Antonio; Franco,Omar; Domínguez,Aurelio. |
| The evaluation and selection of potato (Solanum tuberosum) cultivars for commercial production in the high valleys of Mexico are important for plant breeding, seed production, and the generation of technology. In this work, ten potato cultivars from five different environments in México were evaluated to determine the proportion of genetic variation contained within each. The potatoes were sown in a completely randomized complete block design. Heritability was determined to be between 53% and 83%, suggesting that there is genetic variability among the potato cultivars that might be agronomically important. According to the additive main effects and multiplicative interaction (AMMI) model, the highest tuber yields were obtained at the locality named... |
| Tipo: Journal article |
Palavras-chave: AMMI model; Cluster analysis; Principal component analysis; Solanum tuberosum. |
| Ano: 2009 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202009000300006 |
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| Johnston,Myrna; Olivares,Alfredo; Bustos,Yoespi. |
| Morus alba and Morus multicaulis, common ornamental species in Chile, were studied regarding their growth and dry matter production. In Santiago (Metropolitan Region), plants from vegetative propagation, one part growing under field conditions and the other in a plastic greenhouse were used; both with similar soil, water availability and cutting system (0.20 and 0.40 m). Periodically, four shoots per selected plant were measured for length, number of leaves and dry weight. Previously, a correlation between dry matter and foliar size (length, width, area) of each species was established to estimate the latter. Correlation coefficients obtained had a R² higher than 0.60 whereas the length and width used to estimate foliar area had an R² of 0.96 to M.... |
| Tipo: Journal article |
Palavras-chave: Morus multicaulis; M. alba; Mulberries; Temperature regimes; Greenhouse; Vegetative growth. |
| Ano: 2011 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202011000100004 |
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| Souza,Carlos H. Wachholz de; Mercante,Erivelto; Prudente,Victor H. R.; Justina,Diego D.D.. |
| C.H.W Souza, E. Mercante, V.H.R. Prudente and D.D.D. Justina. 2013. Methods of performance evaluation for the supervised classification of satellite imagery in determining land cover classes. Cien. Inv. Agr. 40(2): 419-428. Satellite imagery, in combination with remote sensing techniques, provides a new opportunity for monitoring and assessing crops with lower cost and greater objectivity than traditional surveys. The present research employed Landsat 5/TM satellite imagery to identify the land cover classes in Cafelândia (Paraná, Brasil), a predominantly agricultural town. Five supervised classification methods (parallelepiped (PL), minimum distance (MND), Mahalanobis distance (MHD), maximum likelihood classifier (MLC) and spectral angle mapper (SAM))... |
| Tipo: Journal article |
Palavras-chave: Accuracy indices; Agricultural landscape; Classifiers; Remote sensing. |
| Ano: 2013 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202013000200016 |
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| Pelicano,Alicia; Divo de Sesar,Marta; Zamuner,Norma; Danelón,José Luis; Yoshida,Miriam. |
| El objetivo de este trabajo fue determinar un protocolo eficiente para la propagación vegetativa de la morera {Morus alba). Al mismo tiempo tuvo el propósito de evaluar la influencia de este protocolo de propagación en la alimentación de las larvas de Bombyx mor i y en el porcentaje de seda cruda producido. Plantas de morera, propagadas vegetativamente, fueron transplantadas a macetas de 4 L, tratadas con N:P:K (15:15:15, 15 g) (F) y/o 6-bencilaminopurina (5 mg-L -1) (Ck). En otoño y primavera, se utilizaron hojas para la alimentación de una cohorte de larvas de tercer estadio. Se observó que el 60% de las plantas tratadas con Ck brotaron en julio y las restantes lo hicieron en agosto. Aunque las plantas fertilizadas (TF) y fertilizadas y tratadas con... |
| Tipo: Journal article |
Palavras-chave: Bombyx morí; Citoquinina; Morus alba. |
| Ano: 2007 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202007000200001 |
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| Loyola,Nelson; Pavéz,Paula; Lillo,Sergio. |
| The present study extracted pectin from Pink Lady apples (Malus pumila), which present at physiological maturity an average 50% of red-color coverage, to assess whether this variety is characterized by a high (HM) or low methoxyl value (LM). The raw materials were obtained from the Marengo farm, Los Niches, Curicó province, in the south-central region of Chile. Acid hydrolysis was used and the material was then subjected to sensory analysis, evaluating the organoleptic characteristics of pectin. The pectin was extracted with citric acid, which was tested under three pH conditions (2.5, 3.0 and 3.5, the latter corresponding to the natural pH of apples) for 60 and 90 min and subjected to a constant temperature of 90 °C. The degree of esterification (DE) of... |
| Tipo: Journal article |
Palavras-chave: Apple; Pectin; Esterification; Sensory analysis. |
| Ano: 2011 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202011000300012 |
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| Registros recuperados: 443 | |
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