Resumo
The present work was carried out in order to study: (1) The symptoms of deficiency of macronutrients (N, P, K, Ca, Mg, S) in guava (Psidium guajava L.). (2) The modifications induced by those treatments in the histological make up of the leaves. Young guava plants were grown in nutrient solution two treatments being used, namely: complete solution (HOAGLAND and ARNON, 1950), deficient solution, in which a given element was ommitted. The main conclusions can be summaryzed as follows. a) Symptoms Clear cut symptoms of malnutrition were observed in the treatments: -N, -P, -Ca, -K, -Mg, and -S. The signal - stared respectively for deficient level. b) Histological effects Usually the characteristics of the chloroplasts were affected: loss of the green and coalescence into irregular bodies.
Sintomas externos (morfológicos) e internos (anatômicos), observados em folhas de goiabeira (Psidium guajava L.), de plantas cultivadas em solução nutritiva com carência dos macronutrientes* * Os autores agradecem à Fundação Rockefeller e ao Conselho Nacional de Pesquisas, que forneceram o equipamento e o material que tornaram possível o presente trabalho.
W. R. Accorsi; H. P. Haag; F. A. F. de Mello; M. O. C. Brasil Sobrinho
Escola Superior de Agricultura «Luiz de Queiroz»
SUMMARY
The present work was carried out in order to study:
(1) The symptoms of deficiency of macronutrients (N, P, K, Ca, Mg, S) in guava (Psidium guajava L.).
(2) The modifications induced by those treatments in the histological make up of the leaves. Young guava plants were grown in nutrient solution two treatments being used, namely: complete solution (HOAGLAND and ARNON, 1950), deficient solution, in which a given element was ommitted.
The main conclusions can be summaryzed as follows.
a) Symptoms Clear cut symptoms of malnutrition were observed in the treatments: -N, -P, -Ca, -K, -Mg, and -S. The signal - stared respectively for deficient level.
b) Histological effects Usually the characteristics of the chloroplasts were affected: loss of the green and coalescence into irregular bodies.
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LITERATURA CITADA
Recebido para publicação em 3 de março de 1960.
- ACCORSI, W. R., H. P. HAAG, 1959 - 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. Revista do Café Português, 1959, n? 23: 5-19.
- HAAG, H. P., 1958 - Efeitos das deficiências e excesso de macronutrientes no crescimento e na composição do cafeeiro (Coffea arabica L., var. bourbon (B. Rodr.) Choussy) cultivado em solução nutritiva. Tese mimeografada - 108 págs. - Piracicaba.
- HOAGLAND, D. R. e D. I. ARNON, 1950 - The water culture method for growing plants without soil. Calif., Agr. Exp. Sta., Berkeley, Calif., Circ. 347.
- SMTTH, K. L., 1957 - Growing and preparing Guavas - Department of Agriculture - Bulletin N.v 74 - U.S.A.
Datas de Publicação
-
Publicação nesta coleção
10 Set 2012 -
Data do Fascículo
1960
Histórico
-
Recebido
03 Mar 1960
