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Estudos sôbre alimentação mineral do cafeeiro.: VII. Interação entre fósforo e ferro em cafeeiro (Coffe arabica L., var. Caturra KMC) cultivado em solução nutritiva

Resumo

The present work was carried out in order to study: 1 - The effect of several levels of P and Fe on the chemical composition of young coffee plants (Coffea arabica L., var. Caturra, KMC); 2 - The influence of P and Fe in the up take of N, K, Ca, and Mg as revealed by the chemical analyses of coffee tissues. Five treatments with two replicates were used, namely: 1 - Control - plants grown in the solution 2 of HOAGLAND & ARNON (1950); 2 - Omission of P; 3 - 310 p. p.m. of P; 4 - Omission of Fe; 5-28 p. p.m. of Fe. The experiment was carried out in the grenhouse, the pH of the different solutions being kept between 5. 0 and 5. 5; aeration was provided to the solutions. The following conclusions wen drawn: 1 - When P was omitted from the nutrient solution, there was an increase in N, K and Fe content of the plant as compared to the levels found in control plants; 2 - Raising the P level in the substrate brought about an apparent luxury consumption of this element as well as an increase in plant Mg; 3 - High P in the nutrient solution on the other hand, decreased Fe up take but increased the K content; 4 - K content was even higher in plants corresponding to the excess Fe treatment; 5 - A very high P content was found in the roots from the excess Fe treatment, this suggesting the formation of ferric phosphate in those organs; 6 - The control plants had less Fe than those corresponding to the minus Fe treatment.


E. S. A. "Luiz de Queiroz"

SUMMARY

The present work was carried out in order to study:

1 - The effect of several levels of P and Fe on the chemical composition of young coffee plants (Coffea arabica L., var. Caturra, KMC);

2 - The influence of P and Fe in the up take of N, K, Ca, and Mg as revealed by the chemical analyses of coffee tissues.

Five treatments with two replicates were used, namely:

1 - Control - plants grown in the solution 2 of HOAGLAND & ARNON (1950);

2 - Omission of P;

3 - 310 p. p.m. of P;

4 - Omission of Fe; 5-28 p. p.m. of Fe.

The experiment was carried out in the grenhouse, the pH of the different solutions being kept between 5. 0 and 5. 5; aeration was provided to the solutions.

The following conclusions wen drawn:

1 - When P was omitted from the nutrient solution, there was an increase in N, K and Fe content of the plant as compared to the levels found in control plants;

2 - Raising the P level in the substrate brought about an apparent luxury consumption of this element as well as an increase in plant Mg;

3 - High P in the nutrient solution on the other hand, decreased Fe up take but increased the K content;

4 - K content was even higher in plants corresponding to the excess Fe treatment;

5 - A very high P content was found in the roots from the excess Fe treatment, this suggesting the formation of ferric phosphate in those organs;

6 - The control plants had less Fe than those corresponding to the minus Fe treatment.

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  • Estudos sôbre alimentação mineral do cafeeiro. VII. Interação entre fósforo e ferro em cafeeiro (Coffe arabica L., var. Caturra KMC) cultivado em solução nutritiva

    L. Neptune Menard; E. Malavolta
  • Datas de Publicação

    • Publicação nesta coleção
      11 Set 2012
    • Data do Fascículo
      1962
    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