Resumo
This paper deals with the preliminary results of a sand culture experiment carried out to obtain physiological bases to study the fertilization of cassava in the State of São Paulo. On the other hand, the authors are interested in the possible influence of mineral nutrients in the quantity and quality of starch. Cassava (Manihot utilissima Pohl.), "Branca de Sta. Catarina" variety, was grown under the following treatments: NO PO KO, NO P1 K1, N1 P0 Kl, NI P1K0, N2 p1 Kl N1 P2 K1 and N1 P1 K2. A striking response to phosphorus was observed among the treatments. However, once secured the necessary phosphoric level to the plant, the production becomes limited by nitrogen; in other words, increase in yield can be accomplished only by raising the nitrogenous level. The present results suggest that the remarkable effects of phosphates applied to cassava cultures in the State of São Paulo are due not only to the poor quality of our soils, as far phosphorus is concerned: we are facing a positive physiological response showed by the plant.
ISecção de Química Agrícola, E. S. A. "Luiz de Queiroz", U.S.P., Piracicaba, Estado de São Paulo
IISecção de Fitotécnica, E. S. A. "Luiz de Queiroz", U.S.P., Piracicaba, Estado de São Paulo
IIISecção de Tecnologia, Instituto Agronômico do Estado de São Paulo, Campinas, Estado de São Paulo
SUMMARY
This paper deals with the preliminary results of a sand culture experiment carried out to obtain physiological bases to study the fertilization of cassava in the State of São Paulo. On the other hand, the authors are interested in the possible influence of mineral nutrients in the quantity and quality of starch. Cassava (Manihot utilissima Pohl.), "Branca de Sta. Catarina" variety, was grown under the following treatments: NO PO KO, NO P1 K1, N1 P0 Kl, NI P1K0, N2 p1 Kl N1 P2 K1 and N1 P1 K2.
A striking response to phosphorus was observed among the treatments. However, once secured the necessary phosphoric level to the plant, the production becomes limited by nitrogen; in other words, increase in yield can be accomplished only by raising the nitrogenous level. The present results suggest that the remarkable effects of phosphates applied to cassava cultures in the State of São Paulo are due not only to the poor quality of our soils, as far phosphorus is concerned: we are facing a positive physiological response showed by the plant.
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LITERATURA CITADA
Trabalho apresentado na IV Reunião Brasileira de Ciência do Solo, em Julho de 1953, em Belo Horizonte Secção IV - Fertilidade do Solo
- GOMES, F. PIMENTEL e E. MALAVOLTA. 1949. Aspectos matemáticos e estatísticos da lei de Mitscherlich. An. E. S. A. "Luiz de Queiroz", U. S. P. 6: 193-229.
- GROSSMAN, J. 1946. A cultura da mandioca no Rio Grande do Sul. Rev. Fac. Agron. (Montevideo) 42: 1-33.
- HAMBIDGE, GOVE (Editor). 1944. Hunger sings in crops, Second Printing, Publ. by The American Soc. of Agronomy and The National Fertilizer Association, Washington, D. C.
- HOAGLAND, D. R. and D. I. ARNON. 1939. The water-culture method for growing plants without soil. Univ. of California Agr. Expt. Sta. (Berkeley, Calif.) Circ. 347.
- NORMANHA, E. S. e A. S. PEREIRA. 1950. Aspectos agronômicos da cultura da mandioca (Manihot utilissima Pohl). Bragantia 10: 179-202.
Adubação da mandioca (Manihot utilissima Pohl.) I. Ensaio em areia lavada (Nota prévia)
Datas de Publicação
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Publicação nesta coleção
01 Nov 2012 -
Data do Fascículo
1953
