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
مستويات الكالسيوم والبورون في البراعم الزهرية للكمثرى (.Pyrus sp) في جنوب البرازيل
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Abstract
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.
كان الهدف من هذه الدراسة تقييم مستويات الكالسيوم (Ca) والبورون (B) في البراعم الزهرية للكمثرى، باختلاف المواقع، والأصناف، وفترات السنة، وأجزاء البرعم. نُفذت التجارب في موقعين بظروف مناخية متباينة في جنوب البرازيل (مركز أبحاث إمبرابا للمناخ المعتدل، في بيلوتاس-RS، والمحطة التجريبية لمؤسسة البحوث الزراعية والإرشاد الريفي في سانتا كاتارينا، في ساو جواكيم-SC)، خلال شتاء عامي 2000 و2001. أُجريت ثلاث تجارب شملت ثلاثة أصناف: نيجيسيكي (القرن العشرون)، وكوسوي، وكيفر. حُددت مستويات الكالسيوم والبورون بالطريقة المعدلة من قِبل فريري (1998). ظلت مستويات الكالسيوم والبورون دون تغيير تقريباً خلال فصل الشتاء في البراعم الزهرية للصنفين كيفر ونيجيسيكي في بيلوتاس-RS. واحتوى الصنف نيجيسيكي على مستويات من البورون أعلى من الصنف كيفر، الأكثر تكيفاً مع المنطقة. ومنذ بداية الخريف حتى أوائل الشتاء، طرأت زيادة في مستويات البورون في كلا الموقعين ولدى كلا الصنفين. ووُجد أعلى مستوى للبورون في الجزأين القاعدي والمتوسط من البراعم الزهرية، في حين وُجدت أعلى مستويات الكالسيوم في الجزء القاعدي.
| Reference Key |
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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| URL | |
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