Estudos sobre a nutrição mineral do milho: II. efeito de doses crescentes de N, R e K no crescimento, produção e composição mineral da variedade Piranão em condições controladas^*

 

Studies on the mineral nutrition of corn: II. efect of rates of N, P, and K on growth, yield and mineral composition of the variety Piranão under controlled conditions

 

 

E. Malavolta^I; L. C. Basso^I; E G. D. Oliveira^I; C. A. Vasconcellos^II; Z. G. Santos^II; J. M. Fortes^II; J. Fernandes^II; N.P. Stamford^II; J.O. Lorenzi^II; N. F. Sampaio^II; F. J. Hass^II, J. C. Freire^II; M. Souza^II; N. Ventorim^II; R. Victoria F.^II; CA. Rosalén^II; E.A. Zago^II; M.T. Miranda^II; S.A. Lima^II, A.M.G. Castro^II; A.P. Souza^II; E.S. Lopes^II; L.F. Sobral^II; L.A. Lovato^II, M. Menezes^II; E O. Tisselli F.°^II

^IDepartamento de Química, ESALQ - USP
^IIEstudantes pós graduados de Solos & Nutrição de Plantas

 

 

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RESUMO

O milho, var. Piranão, foi cultivado em solução nutritiva com níveis crescentes de N, R e K. Houve resposta linear à adição de N e assintótica às doses de R e de K. A determinação da atividade da reductase de nitrato se correlacionou melhor com a produção da matéria seca que a do N total nas folhas. O teor de potássio total nas folhas, por sua vez refletiu melhor o estado nutricional que a determinação de putrescina nas folhas.

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SUMMARY

Maize plants, Piranão cultivar, were grown in nutrient solution with 5 levels each of N, R and K till harvest.
Nitrate reductase activity and putrescine level were determined in leaves of plants in the N and K series, respectively, at silking stage.
Upper and lower leaves were analysed for N, R and K in the corresponding treatments at the end of the life cycle.
The main conclusions were the following :
5.1 There was a linear effect of level of N in the substrate on dry matter production. 5.2. High activities of nitrate reductase suggest that under natural conditions the variety should be very responsive to N fertilization.
5.3. An asymptotic response curve was found in the treatments with increasing levels of R in the medium, as well as in the case of the K treatments.
5.4. Curves of response of roots (dry matter) showed a tendency to level of as a function of increasing levels of element at lower concentrations than the components aeral part of the plant (leaves, stems, ears).
5.5. Determination of leaf putrescine did not of prove a better indicator of the K status leaf K.
5.6. The variety under study seems to be relatively more efficient in the utilization of N for yield components; the efficiency for utilization of K, is rather low and that for R is intermediate, findings that should have a bearing on the fertilization in field conditions.

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LITERATURA CITADA

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Entregue para publicação em 15/12/1976

 

 

* Com ajuda da EMBRAPA, BNDE (contrato FLINT EC 293), CNEX e FAPESP