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da Rosa C.M.,Federal University of Rio Grande do Sul | Castilhos R.M.V.,Federal University of Pelotas | Pauletto E.A.,Pesquisador da Embrapa Clima Temperado | Pillon C.N.,Federal University of Pelotas | dos Anjos Leal Leal O.,Federal University of Pelotas
Revista Brasileira de Ciencia do Solo | Year: 2011

On paddy soils in the southern region of the State of Rio Grande do Sul, Brazil, irrigated (flooded) rice is grown on 1 ́000 ́000 ha, under different soil management systems. The influence of poor drainage and alternating oxidation and reduction cycles on the content of soil organic carbon is still poorly understood. This long-term study (21 years) was conducted in Capão do Leão, RS, Brazil, to evaluate the effect of irrigated rice management systems on soil organic carbon stocks and physical fractions of the organic matter (OM) of an Albaqualf soil. OM in soil samples from the layers 0-0.025; 0.025-0.05; 0.05-0.10 and 0.10-0.20 m was physically fractionated by densimetry in the treatments: TC- traditional cultivation system: one year rice (conventional tillage) and two years fallow; RCV- continuous cultivation of rice (conventional tillage) and herbicide weed control; RNT-succession ryegrass/rice in no tillage and SN- native pasture. In the system of rice in no tillage (RNT), after 21 years, the values of total organic carbon and the free light fraction stock were better preserved, to a depth of 0.05 m, compared to the systems with rice under conventional tillage TC and RCV. The occluded light fraction was not sensitive to detect the effects of different tillage systems, indicating soil a low efficiency of physical protection of OM by aggregate occlusion in the lowland soil, which may be related to the poor soil drainage in the aggregation process. Excessive moisture in the winter and flooding of the rice crops may induce a transitory aggregation between crops. The amount of organic carbon in this Albaqualf soil, between cultivation systems as well as in depth, consisted mainly of the more stable heavy fraction that is more resistant to degradation. Source

Raseira M.C.B.,Brazilian National Council for Scientific and Technological Development | Nakasu B.H.,Pesquisador aposentado da Embrapa Clima Temperado | Ueno B.,Pesquisador da Embrapa Clima Temperado | Scaranari C.,Embrapa Transferencia de Tecnologia
Revista Brasileira de Fruticultura | Year: 2010

The peach breeding program of Embrapa Clima Temperado has, among the objectives the development of fresh market cultivars that fulfill the consumer's preference. Some of the largest consumer centers, such as São Paulo and Curitiba, prefer white flesh peaches with sweet flavor. Cultivar BRS Kampai originated from a crossing between 'Chimarrita' and 'Flordaprince', adds the low chilling requirement, advantageous for subtropical areas, to the good appearance and superior flavor to any of the parents. The harvest period of this cultivar begins mid November, in Pelotas, RS, (and in the second half of October, in Atibaia, SP) a few days before Rubimel (yellow flesh) and Premier (white flesh) cultivars being a good substitute for the last one. Source

Timm C.R.F.,Federal University of Pelotas | Schuch M.W.,FAEM UFPel | Tomaz Z.F.P.,Fruticultura de Clima Temperado | Mayer N.A.,Pesquisador da Embrapa Clima Temperado
Semina:Ciencias Agrarias | Year: 2015

The use of rootstocks resulting from sexual propagation is a major problem that peach crop has in Brazil, reflecting the lack of plant homogeneity, which compromises the productivity of orchards. The clonal propagation is a promising alternative for the production of homogeneous seedlings with low cost and speed, as well as the maintenance of important agronomic characteristics. Therefore, the study aimed to assess the feasibility of propagation of rootstocks of Nemared, Flordaguard and Okinawa peach cultivars through herbaceous minicuttings, testing different concentrations of IBA (0; 1,000; 2,000; and 3,000mg.L-1). The minicuttings were immersed in the solution for five seconds and, then, placed in clear plastic containers containing medium grained vermiculite. The experiment was conducted with four replications of 20 minicuttings in the greenhouse. In 45 days, it was observed that Nemared obtained 76% of rooting with 1,000 mg.L-1 of IBA, not differing from Flordaguard with 66%. The estimated dose of IBA for maximum rooting was 1,590 mg.L-1. Source

Gonzatto M.P.,Federal University of Rio Grande do Sul | Schwarz S.F.,Federal University of Rio Grande do Sul | de Oliveira R.P.,Pesquisador da Embrapa Clima Temperado | Bender R.J.,Federal University of Rio Grande do Sul | de Souza P.V.D.,Federal University of Rio Grande do Sul
Revista Brasileira de Fruticultura | Year: 2015

This study aims to present the basic horticultural characterization of the new tangor cultivar ‘URSBRS Hada’. By way of evaluations at the conditions of the Central Depression region of the state of Rio Grande do Sul, Brazil, the cultivar shows late ripening (October to December). Its fruits might be destined either for juice or for fresh consumption. The cultivar presents tolerance to diseases like citrus canker, black spot and alternaria brown spot under field conditions. The fruits have an obloid shape, yellowish to yelloworange peel color and are quite juicy, with high contents of soluble solids and high acidity. Furthermore, it is a very productive cultivar, yielding 20-25 t ha-1 per year. In summary, the tangor cultivar ‘URSBRS Hada’ presents itself as a feasible varietal option for the citrus industry. © 2015, Sociedade Brasileira de Fruticultura. All rights reserved. Source

Mayer N.A.,Pesquisador da Embrapa Clima Temperado | Ueno B.,Pesquisador da Embrapa Clima Temperado | da Silva V.A.L.,Brazilian National Council for Scientific and Technological Development
Revista Brasileira de Fruticultura | Year: 2015

Leaf nutrient content indicate the nutritional status of the tree, assist in fertilizer recommendation and may indicate incompatible scion/rootstock combinations in budded fruit trees. The objective of this study was to evaluate leaf nutrient contents of ‘Maciel’ peach budded on five rootstocks (‘Aldrighi’, ‘Capdeboscq’, ‘Flordaguard’, ‘Nemaguard’ and ‘Okinawa’). Two experimental orchards located in Pelotas, Brazil, were evaluated on the 2nd and 3rd years after planting, respectively in 2012 and 2013. We concluded that ‘Aldrighi’, ‘Capdeboscq’, ‘Flordaguard’, ‘Nemaguard’ and ‘Okinawa’ rootstocks did not influence P and Mn leaf content on ‘Maciel’ peach scion, in both orchards and years of evaluation; ‘Nemaguard’ rootstock reduces Mg leaf content of ‘Maciel’ peach scion, but does not change the class of agronomic interpretation; although N, Fe, Zn and B leaf content were below than normal or insufficient in almost all samples from both orchards and years of evaluation, these studied rootstocks did not influence leaf nutrient interpretations. © 2015, Sociedade Brasileira de Fruticultura. All rights reserved. Source

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