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
DOI:
https://doi.org/10.1590/S0071-12761976000100044Abstract
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.Downloads
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Published
1976-01-01
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Section
naodefinida
How to Cite
Malavolta, E., Basso, L. C., Oliveira, E. G. D., Vasconcellos, C. A., Santos, Z. G., Fortes, J. M., Fernandes, J., Stamford, N., Lorenzi, J., Sampaio, N. F., Hass, F. J., Freire, J. C., Souza, M., Ventorim, N., Victoria F, R., Rosalén, C., Zago, E., Miranda, M., Lima, S., … Tisselli F, E. O. (1976). 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 . Anais Da Escola Superior De Agricultura Luiz De Queiroz, 33, 479-499. https://doi.org/10.1590/S0071-12761976000100044