التفاصيل البيبلوغرافية
| العنوان: |
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 ; 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 |
| المؤلفون: |
Malavolta, E., Basso, L. C., Oliveira, E G. D., Vasconcellos, C. A., Santos, Z. G., Fortes, J. M., Fernandes, J., Stamford, N.P., Lorenzi, J.O., Sampaio, N. F., Hass, F. J., Freire, J. C., Souza, M., Ventorim, N., Victoria F, R., Rosalén, CA., Zago, E.A., Miranda, M.T., Lima, S.A., Castro, A.M.G., Souza, A.P., Lopes, E.S., Sobral, L.F., Lovato, L.A., Menezes, M., Tisselli F, E O. |
| المصدر: |
Anais da Escola Superior de Agricultura Luiz de Queiroz; v. 33 (1976); 479-499 ; 2316-8935 ; 0071-1276 |
| بيانات النشر: |
Universidade de São Paulo. Escola Superior de Agricultura Luiz de Queiroz |
| سنة النشر: |
1976 |
| المجموعة: |
Universidade de São Paulo: Portal de Revistas da USP |
| الوصف: |
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. ; 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. |
| نوع الوثيقة: |
article in journal/newspaper |
| وصف الملف: |
application/pdf |
| اللغة: |
Portuguese |
| Relation: |
https://www.revistas.usp.br/aesalq/article/view/39180/42064; https://www.revistas.usp.br/aesalq/article/view/39180 |
| الاتاحة: |
https://www.revistas.usp.br/aesalq/article/view/39180 |
| رقم الانضمام: |
edsbas.4FDF52C8 |
| قاعدة البيانات: |
BASE |