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vol.37 número1Produção, coeficiente de digestibilidade da matéria seca e concentração de nutrientes em Panicum maximum Jacq., em função dos cortes aos 30, 45, 60 e 75 dias de idadeExigências minerais comparadas de dois cultivares de soja (Glycine max (L.) Merrill): Santa Rosa e UFV-1 índice de autoresíndice de assuntospesquisa de artigos
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Anais da Escola Superior de Agricultura Luiz de Queiroz

versão impressa ISSN 0071-1276

Resumo

LORENZI, J.O.; GALLO, J.R.  e  MALAVOLTA, E.. Macronutrient requirements by two cassava cultivars (Manihot esculenta Crantz). An. Esc. Super. Agric. Luiz de Queiroz [online]. 1980, vol.37, n.1, pp.443-462. ISSN 0071-1276.  http://dx.doi.org/10.1590/S0071-12761980000100028.

This paper deals with the results of a field experiment conducted in order to study dry matter production and macronutrient accumulation in two cassava cultivars 'Branca de Santa Catarina' and 'IAC Mantiqueira'. Plants received an uniform dressing of N, P2O5 and K2O of 40, 80 and 60 kg/ha, respectively as ammonium sulphate, simple superphosphate, and muriate of potassium; N was top dressed 60 days after emergence. Two irrigations were provided in the beginning of the growth cycle. Plants were sampled and analysed for growth parameters and macronutrient composition in six occasions with 60 day intervals: The main conclusions and relevant data were as follows: 1. there was a statistical difference in root production of the two cultivars;.maximum dry matter accumulation took place in the period pf 120 - 180 days after emergence; 2. extraction of macronutrients was the same in the two cultivars, except for P; export was different only in the case of K and S.

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