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| Fenilli,Tatiele A.B.; Reichart,Klaus; Bacchi,Osny O.S.; Trivelin,Paulo C.O.; Dourado-Neto,Durval. |
| The use of the 15N label for agronomic research involving nitrogen (N) cycling and the fate of fertilizer-N is well established, however, in the case of long term experimentation with perennial crops like citrus, coffee and rubber tree, there are still shortcomings mainly due to large plant size, sampling procedures, detection levels and interferences on the system. This report tries to contribute methodologically to the design and development of 15N labeled fertilizer experiments, using as an example a coffee crop fertilized with 15N labeled ammonium sulfate, which was followed for two years. The N of the plant derived from the fertilizer was studied in the different parts of the coffee plant in order to evaluate its distribution within the plant and the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Experimental design; Replicate variability; Stable isotope methodology; Perennial crop. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652007000400015 |
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| Pires,Luiz F.; Reichardt,Klaus; Cooper,Miguel; Cássaro,Fabio A.M.; Dias,Nivea M.P.; Bacchi,Osny O.S.. |
| Soil pore structure characterization using 2-D image analysis constitutes a simple method to obtain essential information related to soil porosity and pore size distribution (PSD). Such information is important to infer on soil quality, which is related to soil structure and transport processes inside the soil. Most of the time soils are submitted to wetting and drying cycles (W-D), which can cause important changes in soils with damaged structures. This report uses 2-D image analysis to evaluate possible modifications induced by W-D cycles on the structure of damaged soil samples. Samples of three tropical soils (Geric Ferralsol, GF; Eutric Nitosol, EN; and Rhodic Ferralsol, RF) were submitted to three treatments: 0WD, the control treatment in which... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil bulk density; Soil water content; Soil porosity; Micromorphology; Soil structure; Compaction. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000100016 |
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| Castro,Paulo R.C.; Fachinello,José C.; Faquim,Valdemar; Ramalho,Jair F.G.P.; Bacchi,Osny O.S.. |
| Com o objetivo de verificar o efeito do estrangulamento do caule e do ácido indolbutírico no enraizamento de estacas de plantas jovens de seringueira, foi conduzido este ensaio. As estacas utilizadas foram retiradas da perte basal, mediana e apical, sendo que parte das estacas foram estranguladas com fio de arame abaixo de duas folhas, 30 dias antes do estaqueamento no campo. As estacas tiveram suas bases imersas por 12 horas em água ou em solução com 200 ppm de IBA. Os resultados mostraram que as estacas da posição basal da planta foram as que apresentaram maior porcentagem de enraizamento. 0 estrangulamento na base da estaca não influiu no enraizamento. Aplicação de IBA + KOH causou necrose na base das estacas. Ocorreu formação de calo em 77,7% das... |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 1984 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0071-12761984000100020 |
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| Oliveira,Júlio César Martins de; Reichardt,Klaus; Bacchi,Osny O.S.; Timm,Luis Carlos; Dourado-Neto,Durval; Trivelin,Paulo César Ocheuse; Tominaga,Tânia Toyomi; Navarro,Roberta de Castro; Piccolo,Marisa de Cássia; Cássaro,Fábio Augusto Meira. |
| Results of an organic matter management experiment of a sugar cane crop are reported for the first cropping year. Sugar cane was planted in October 1997, and labeled with a 15N fertilizer pulse to study the fate of organic matter in the soil-plant system. A nitrogen balance is presented, partitioning the system in plant components (stalk, tip and straw), soil components (five soil organic matter fractions) and evaluating leaching losses. The 15N label permitted to determine, at the end of the growing season, amounts of nitrogen derived from the fertilizer, present in the above mentioned compartments. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fertilizer; Nitrogen; N label; Soil; Sugar cane. |
| Ano: 2000 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000300015 |
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