Efeitos de doses de boro, em mudas de diferentes progênies de dois cultivares de cafeeiro (Coffea arabica L.)
Arquivos
Data
1991
Autores
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Editor
Universidade Federal de Lavras
Resumo
A nutrição mineral das mudas de café tem merecido algum estudo, quase que exclusivamente, objetivando o fornecimento de macronutrientes. Com relação aos micronutrientes pouco se conhece. A s s i m , este trabalho teve por objetivo verificar os
efeitos de boro, aplicado por via foliar e por via substrato, no desenvolvimento e composição química da parte aérea de mudas de café (Coffea arabica L.) de diferentes progênies pertencentes a 2 cultivares. O experimento foi conduzido no viveiro de formação de mudas de café da Escola Superior de Agricultura de Lavras, no período de outubro de 1988 a abril de 1989. O delineamento experimental utilizado foi de blocos casualizados, em três repetições, 'segundo esquema fatorial em subparcelas. As parcelas foram constituídas pelas 4 doses de adubação foliar (O,O%; 0,1%: 0,2% e 0,3% de bórax) em duas aplicações. As subparcelas, em esquema fatorial, foram constituídas pelas 4 doses de adubação de substrato (0 ,O : 2,2: 4,4 e 6,6 gramas
de boro por m3 de mistura) e 6 progênies pertencentes a 2 cultivares de café. Cada parcela foi constituída por 12 plantas, utilizando-se, para avaliações, as 4 plantas centrais. Ao final de 6 meses após semeadura, quando as plantas estavam em estágio de transplante, foram avaliados os parâmetros de crescimento (altura, diâmetro do caule, área foliar e peso seco da raiz e da parte aérea) e determinados os teores de macro e mlcronutrientes contidos na matéria seca da parte aérea das mudas. Nas condições em que foi conduzido o trabalho constatou-se que não houve interação entre cultivares e progênies de cafeeiro e as doses de boro, via foliar e via substrato, para os parânetros de crescimento. O cultivar Catuaí apresentou maior área foliar e peso seco da parte aérea e o cultivar Mundo Novo maior altura. A utilização de doses crescentes de boro, via foliar, em todos os cultivares e progênies testados, elevou os teores deste elemento na matéria seca da parte aérea, em proporção à dose aplicada, obtendo-se o teor de 60,42 ppm quando-se utilizou a dose de 0 ,3 %, em duas aplicações e reduziu o teor de zinco. A aplicação de boro, via substrato, em todas as cultivares e progênies testadas reduziu o teor de ferro e não modificou o teor dos demais nutrientes, inclusive o boro, na parte aérea das mudas. Não houve interações entre cultivares e progênies e as doses de boro, foliar e substrato, para os teores de macro e micronutrientes.
Coffee trees mineral nutrition has been studied in order to provide macronutrients. As to the micronutrients there is not enough information concerning. This work was carried out in the coffee trees nursery at the Escola Superior de Agricultura de Lavras, from October 1988 to April 1989 with the objective of verifying the effects of boron when applied on the leaf and in the soil upon both the aereal part growth and the chemical composition of coffee trees (Coffea arabica L.) from different cultivars and progenies. A randomized block design in a factorial arrangement on sub-plots with three replications was used. Each plot consisted in two applications of four dosages of borax foliar fertilizer (0.0%: 0.1%: 0.2% and 3;0%), and the sub-plots in a factorial arrangement - consisted of four fertilizer dosages applied in the soil (0.0: 2.2: 4.4 and 6.6 g of Boron/m3) and six progenies from two coffee cultivars. Each plot consisted of twelve plants from which the four central ones were taken for evaluations. Six months after seeding growth parameters (height: stem diameter, foliar area and dry weight of the root and the aereal part) were evaluated, and macro and micronutrients levels in the dry matter of the trees aereal part were determined. Under the conditions in which this work was carried out the findings were: no interaction among coffee tree cultivars and progenies and the boron dosages applied either on the leaves or in the soil for determining growth parameters could be found. Catuai cv. had the largest foliar area and the highest dry weight of the aereal part whereas Mundo Novo cv. was the highest one. When increasing Boron dosages were applied on both the cultivars and the progenies leaves this nutrient content in the dry matter of the aereal part increased proportionally those dosages. When 0.3% boron dosages were used in two applications boron content in the dry matter of the aereal part reached 60.42 ppm. When boron was applied in the soil for all cultivars and progenies the iron content was found to decrease, although it had no effect on the other nutrients content including boron itself in the aereal part of the trees. As to the macro and micronutrients content no interaction among cultivars and progenies and the boron dosages applied either on the leaves or in the soil could be noticed.
Coffee trees mineral nutrition has been studied in order to provide macronutrients. As to the micronutrients there is not enough information concerning. This work was carried out in the coffee trees nursery at the Escola Superior de Agricultura de Lavras, from October 1988 to April 1989 with the objective of verifying the effects of boron when applied on the leaf and in the soil upon both the aereal part growth and the chemical composition of coffee trees (Coffea arabica L.) from different cultivars and progenies. A randomized block design in a factorial arrangement on sub-plots with three replications was used. Each plot consisted in two applications of four dosages of borax foliar fertilizer (0.0%: 0.1%: 0.2% and 3;0%), and the sub-plots in a factorial arrangement - consisted of four fertilizer dosages applied in the soil (0.0: 2.2: 4.4 and 6.6 g of Boron/m3) and six progenies from two coffee cultivars. Each plot consisted of twelve plants from which the four central ones were taken for evaluations. Six months after seeding growth parameters (height: stem diameter, foliar area and dry weight of the root and the aereal part) were evaluated, and macro and micronutrients levels in the dry matter of the trees aereal part were determined. Under the conditions in which this work was carried out the findings were: no interaction among coffee tree cultivars and progenies and the boron dosages applied either on the leaves or in the soil for determining growth parameters could be found. Catuai cv. had the largest foliar area and the highest dry weight of the aereal part whereas Mundo Novo cv. was the highest one. When increasing Boron dosages were applied on both the cultivars and the progenies leaves this nutrient content in the dry matter of the aereal part increased proportionally those dosages. When 0.3% boron dosages were used in two applications boron content in the dry matter of the aereal part reached 60.42 ppm. When boron was applied in the soil for all cultivars and progenies the iron content was found to decrease, although it had no effect on the other nutrients content including boron itself in the aereal part of the trees. As to the macro and micronutrients content no interaction among cultivars and progenies and the boron dosages applied either on the leaves or in the soil could be noticed.
Descrição
Dissertação de Mestrado defendida na Universidade Federal de Lavras
Palavras-chave
Cafe Mudas Efeito do boro Crescimento Composicao quimica Adubacao boratada
Citação
Abrahão, Edinaldo Jose. Efeitos de doses de boro, em mudas de diferentes progênies de dois cultivares de cafeeiro (Coffea arabica L.). Lavras : ESAL, 1991. 90p. (Dissertação - mestrado em Agronomia, área de concentração: Fitotecnia) Orientador: Milton Moreira de Carvalho T 633.7335 A159e 1991