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Alterações morfológicas e citológicas do cafeeiro (Coffea arabica L, var. Bourbon (B. Rodr.) Choussy) cultivado em solução nutritiva decorrentes das deficiências e excessos dos macronutrientes

Resumo

The present work was carried out in order to study: (1) the symptoms of deficiency and excess of macronutrients (N, P, K, Ca, S, Mg) in the coffee plant (Coffea arabica L. var. Mundo novo); (2) the modifications induced by those treatments in the hystological make up of the leaves; (3) the effects of deficiency and excess on the growth and in the chemical composition of the plants. Young coffee plants were grown in nutrient solution, three treatments being used, namely: complete solution (HOAGLAND & ARNON, 1950), deficient solution, in which a giVen element was omitted, and solution with 3 times the concentration of the element under study. The main conclusions can be summaryzed as follows. 1. SYMPTOMS. Clear cut symptoms of malnutrition were observed in the treatments: -N, -P, +P, -Ca, -Mg, -S and +S; the signals - and + stared respectively for deficient and excess level. 2. HISTOLOGICAL EFFECTS. The most definite alterations took place in the treatments +P, -Mg and +S. Usually the characteristics of the chloroplasts were affected: loss of the green color and coalescence into irregular bodies.


Alterações morfológicas e citológicas do cafeeiro (Coffea arabica L, var. Bourbon (B. Rodr.) Choussy) cultivado em solução nutritiva decorrentes das deficiências e excessos dos macronutrientes* * Os autores agradecem à Fundação Rockefeller e ao Conselho Nacional de Pesquisas a ajuda em equipamento e material utilizados neste experimento. ** ** Trabalho aprovado pela X Reunião Anual da Sociedade Botânica do Brasil, realizada na Escola Nacional de Agronomia, no período de 18 a 24 de janeiro de 1959.

Walter R. Accorsi; Henrique P. Haag

Escola Superior de Agricultura "Luiz de Queiroz"

SUMMARY

The present work was carried out in order to study:

(1) the symptoms of deficiency and excess of macronutrients (N, P, K, Ca, S, Mg) in the coffee plant (Coffea arabica L. var. Mundo novo);

(2) the modifications induced by those treatments in the hystological make up of the leaves;

(3) the effects of deficiency and excess on the growth and in the chemical composition of the plants.

Young coffee plants were grown in nutrient solution, three treatments being used, namely: complete solution (HOAGLAND & ARNON, 1950), deficient solution, in which a giVen element was omitted, and solution with 3 times the concentration of the element under study.

The main conclusions can be summaryzed as follows.

1. SYMPTOMS.

Clear cut symptoms of malnutrition were observed in the treatments: -N, -P, +P, -Ca, -Mg, -S and +S; the signals - and + stared respectively for deficient and excess level.

2. HISTOLOGICAL EFFECTS.

The most definite alterations took place in the treatments +P, -Mg and +S. Usually the characteristics of the chloroplasts were affected: loss of the green color and coalescence into irregular bodies.

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BIBLIOGRAFIA

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  • *
    Os autores agradecem à Fundação Rockefeller e ao Conselho Nacional de Pesquisas a ajuda em equipamento e material utilizados neste experimento.
  • **
    Trabalho aprovado pela X Reunião Anual da Sociedade Botânica do Brasil, realizada na Escola Nacional de Agronomia, no período de 18 a 24 de janeiro de 1959.
  • Datas de Publicação

    • Publicação nesta coleção
      10 Set 2012
    • Data do Fascículo
      1959
    Universidade de São Paulo, Escola Superior de Agricultura Av.Páduas Dias, 11, C.P 9 / Piracicaba - São Paulo, Brasil, tel. (019)3429-4486, (019)3429-4401 - Piracicaba - SP - Brazil
    E-mail: scientia@esalq.usp.br