níveis de cálcio e boro de gemas florais de pereira (pyrus sp.) no sul do brasil levels of calcium and boron on pear flower buds (pyrus sp.) in southern brazil
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2006
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Abstract
O objetivo deste trabalho foi determinar os níveis de cálcio (Ca) e boro (B) em gemas florais de pereiras em função do local, cultivar, época e sua distribuição nas gemas. Os experimentos foram conduzidos em duas regiões edafoclimática diferentes no Sul do Brasil: em Pelotas-RS, no Centro de Pesquisa Embrapa Clima Temperado, e em São Joaquim-SC, na Estação Experimental da Empresa de Pesquisa Agropecuária e Extensão Rural de Santa Catarina, durante o outono e inverno de 2000 e 2001. Foram executados três ensaios, envolvendo as cultivares Nijisseiki (Século XX), Kousui e Kieffer. As análises quantitativas de cálcio e boro foram realizadas pelo método adaptado por Freire (1998). As análises químicas possibilitaram verificar que os níveis de cálcio e boro permaneceram praticamente inalterados durante o inverno, nas gemas florais das cultivares Kieffer e Nijisseiki, em Pelotas-RS. A cultivar Nijisseiki possui maior teor de boro nas gemas florais do que a cultivar Kieffer, de melhor adaptação. Do início do outono até o início do inverno, há um incremento nos teores de boro em ambos os locais e cultivares. Na cultivar Nijisseiki, os maiores teores de boro foram detectados na porção basal e mediana da gema floral, enquanto os de cálcio ocorreram na porção basal.
The objective of this study was to evaluate calcium (Ca) and boron (B) levels, in pear flower buds, on different locations, cultivars, period of the year and portion of bud. The experiments were carried out in two locations with different climatic conditions in Southern Brazil (Embrapa Clima Temperado Research Centre, in Pelotas-RS, and Experimental Station of Empresa de Pesquisa Agropecuária e Extensão Rural de Santa Catarina, in São Joaquim-SC), during the winter of 2000 and 2001. Three experiments were conducted, involving three cultivars, Nijisseiki (XXth Century), Kousui and Kieffer. The calcium and boron level were determined by the method adapted by Freire (1998). The levels of calcium and boron stayed practically unaltered during the winter in the flower buds of cvs. Kieffer and Nijisseiki, in Pelotas-RS. The cv. Nijisseiki had higher levels of boron than that of cv. Kieffer, more adapted to the region. Since the beginning autumn until early winter there was an increase in levels of boron, in both places and cultivars. The highest boron level was found in the basal and in the medium part of flower buds, whereas the highest levels of calcium was in the basal part.
The objective of this study was to evaluate calcium (Ca) and boron (B) levels, in pear flower buds, on different locations, cultivars, period of the year and portion of bud. The experiments were carried out in two locations with different climatic conditions in Southern Brazil (Embrapa Clima Temperado Research Centre, in Pelotas-RS, and Experimental Station of Empresa de Pesquisa Agropecuária e Extensão Rural de Santa Catarina, in São Joaquim-SC), during the winter of 2000 and 2001. Three experiments were conducted, involving three cultivars, Nijisseiki (XXth Century), Kousui and Kieffer. The calcium and boron level were determined by the method adapted by Freire (1998). The levels of calcium and boron stayed practically unaltered during the winter in the flower buds of cvs. Kieffer and Nijisseiki, in Pelotas-RS. The cv. Nijisseiki had higher levels of boron than that of cv. Kieffer, more adapted to the region. Since the beginning autumn until early winter there was an increase in levels of boron, in both places and cultivars. The highest boron level was found in the basal and in the medium part of flower buds, whereas the highest levels of calcium was in the basal part.
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verssimo2006revistanveis
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| Authors | ;Valtair Veríssimo;Flavio Gilberto Herter;Alexandre Couto Rodrigues;Renato Trevisan;Anderson Carlos Marafon |
| Journal | technocom |
| Year | 2006 |
| DOI |
10.1590/S0100-29452006000100011
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