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Doctoral Thesis
DOI
https://doi.org/10.11606/T.11.1988.tde-20210104-163510
Document
Author
Full name
Elba Lucy de Freitas Donald Moyses
Institute/School/College
Knowledge Area
Date of Defense
Published
Piracicaba, 1988
Supervisor
Title in Portuguese
Acumulação de matéria seca e absorção de nutrientes pelo cafeeiro (Coffea arabica L.) cv. Catuai em solução nutritiva com diferentes doses de zinco e pH
Keywords in Portuguese
CAFE CATUAÍ
MATÉRIA SECA
PH
SOLUÇÃO NUTRITIVA
ZINCO
Abstract in Portuguese
Com o propósito de observar o efeito de doses crescentes de zinco em três valores de pH, sobre o desenvolvimento de plantas de café (Coffea arabica L.) cultivar Catuai, conduziu-se um experimento usando-se solução nutritiva de HOAGLAND & ARNON, 1950, modificado por SARRUGE, 1975. As doses de zinco foram 0,05; 0,10 e 0,20 ppm, na forma de sulfato de zinco, os valores de pH foram: 4,5; 5,5 e 6,5. As plantas foram coletadas e separadas em folhas do 3º e 4º pares, folhas total, ramos e caule. Determinou-se a matéria seca, e as concentrações de nutrientes nas partes das plantas, em função das doses de zinco e do pH. Conclui-se: - As maiores variações na absorção em função dos tratamentos e do pH ocorreram nos 3º e 4º pares de folhas indicando serem estas partes as mais sensíveis às diferenças nutricionais; - O pH da solução nutritiva interferiu na absorção total de zinco; O teor de zinco nos 3º e 4º pares de folhas é diretamente proporcional à concentração do zinco na solução nutritiva; - A concentração de P nos 3º e 4º pares de folhas do cafeeiro é função quadrática crescente da aplicação de Zn no substrato, com valores máximos estimados de 0,205% de P e 0,14 ppm de Zn; - A quantidade de fósforo extraída pelo cafeeiro, diminui nos 3º e 4º pares de folhas quando a concentração de zinco aumenta na solução nutritiva, a partir de 0,13 ppm e pH 6,5; - O aumento da concentração do ZnSO4 na solução nutritiva aumenta os teores de Ca e Fe nos ramos e da quantidade de S na planta toda; - O aumento da concentração de zinco na solução nutritiva reduz o teor de K nos ramos; - A absorção de boro é ascendente até 0,13 ppm de zinco na solução, decrescendo daí em diante.
Title in English
Accumulation of dry matter and nutrients uptake by coffee plants (Coffea arabica L.) cv. Catuai growing in nutritive solution containing different levels of zinc at different pHs
Keywords in English

Abstract in English
The investigation of the effect of the HOAGLAND and ARNON nutritive solution, with modifications, containing crescent levels of zinc at different pH on the growth of coffee plants (Coffea arabica L.) cv. Catuai was carried out. Zinc levels of 0,05, 0,10 and 0,20 ppm as zinc sulfate at pH of 4,5, 5,5 and 6,5 were used. Dry weight and nutrients concentrations were evaluated on the third, and fourth pair of leaves, in the total of leaves, in the branches and in the shoot of hawested plants. The relationship of the obtained results to the zinc levels and pHs indicated: - A higher effect of the zinc level on the third and fourth pair of leaves suggesting these plant parts to be move sensitive to the tested deficiency nutrition; - The pH of the nutritive solution did not affect of zinc uptake by the plants; - The zinc content in the third and fourth pair of leaves was directly related to the zinc concentration in nutritive solution; - The phosphorus concentration in the third and fourth pairs of leaves is a crescent quadratic equation of the zinc levels in the nutritive solution with the estimated maximum value occurring at 0,205% of phosphorus and 0,14 ppm of zinc; - The iron content in third and fourth pair of leaves was also directly related to the zinc concentration in the nutritive solution; - The increase on the zinc concentration of the nutritive solution caused an increase on the calcium and iron content and a decrease on the potassium content in the branches and an increase on the sulfur content in the whole plant; - The amount of phosphorus taken up by the coffee plant is reduced at zinc concentration higher than 0,13 ppm in the nutritive solution; - The uptake of boron ineveases urtill 0,13 ppm of zinc, but deeveases after that.
 
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Publishing Date
2021-01-07
 
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