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Bragantia

Print version ISSN 0006-8705

Bragantia vol.24 no.unico Campinas  1965

http://dx.doi.org/10.1590/S0006-87051965000100027 

Adubação do algodoeiro. XV— ensaios com vários adubos nitrogenados

 

Fertilizer experiments with cotton. XV — trials with various nitrogenous fertilizers

 

 

Milton G. Fuzatto; Popíljo A. Cavaleri; Nelson Machado da Silva

Engenheiros-agrônomos, Seção de Algodão, Instituto Agronômico

 

 


RESUMO

Neste artigo são relatados os resultados de 12 ensaios, instalados em vários tipos de solo do Estado de São Paulo, para comparar o efeito de diferentes adubos azotados na cultura algodoeira.
Salitre do Chile, nitrato de cal IG e Calnitro IG, aplicados no sulco de plantio juntamente com fósforo e potássio, não diferiram substancialmente. Apenas Urecal IG se mostrou menos eficiente.
Aplicados em cobertura aos 30 dias após a germinação, o salitre do Chile, sulfato dc amônio e Nitrocálcio tiveram comportamento semelhante, mas a uréia se mostrou levemente inferior.


SUMMARY

In this paper are reported the results obtained in twelve experiments comparing various nitrogen sources as mineral fertilizers for cotton. Experiments were conducted for some years, located at different soil types used for cotton in the State of São Paulo.
When applying Chilean nitrate, Calnitro IG. nitrato de cal IG and Urecal IG in the furrows together with phosphorus and potassium, the effects obtained were practically the same, except for Urecal IG which showed minor response. With exception of Chilean nitrate, these fertilisers are no more used by farmers presently.
In another series of trials Chilean nitrate, ammonium sulphate, Nitrocalcio (ammonium nitrate + calcium carbonate) and urea were applied as dressing after 30 days of planting time. These treatments had about the same results; however treatment with urea had a lower effect.


 

 

Texto completo disponível apenas em PDF.

Full text available only in PDF format.

 

 

LITERATURA CITADA

1.  AGUIRRE, R. Fertilización nitrogenada del algodón. Efecto de iones secundários en diversos abonos. III.º Simpósio Internacional de Agroquímica sobre el problema del nitrogeno en la agricultura. Sevilla, 17-22, octubre, 1960. (Mimeografado).         [ Links ]

2.  CHRISTIDIS, B. G. & HARRISON, G. J. Cotton Growing Problems. New York, Mc Craw-Hill Book Co., Inc., 1955.         [ Links ]

3.  HOLLEY, K. T., PICKETT, T. A. & DULIN, T. G. A study of ammonia and nitrate nitrogen for cotton. I— Influence on absorption of other elements. Experiment, Georgia Agric. Exp. Sta., 1931. (Bulletin 169).         [ Links ]

4.  LONGENECKER, D. E., LYERLY, P. J. & CHRISTENSEN, P. D, Influence of source of nitrogen fertilizer on yields of Acala cotton in the El Paso Valley, Progress report 1796. Texas Agric. Exp. Sta., 1955. (Mimeografado).         [ Links ]

5.  NAFTEL, J. A. The absorption of ammonium and nitrate nitrogen by various plants at different stages of growth. J. Amer. Soc. Agron. 23: 142-158. 1931.         [ Links ]

6.  NEVES, O. S., VIÉGAS, G. P. FREIRE, E. S. Efeito do uso contínuo de certos adubos azotados sôbre o pH do solo. Bragantia 19: CXXV-CXXXII. 1960.         [ Links ]

7. __________& FREIRE, E. S. Adubação do algodoeiro. II— Ensaios com tortas de mamona e algodão. Bragantia 16: [147]-173. 1957.         [ Links ]

8.__________, __________. Adubação do algodoeiro. III — Ensaios sôbre aplicação de azôto cm cobertura. Bragantia 16: [223]-242. 1957.         [ Links ]

9. __________, __________. Adubação do algodoeiro. IV — Ensaios sôbre época de aplicação de azôto e potássio, Bragantia 16: [269]-297. 1957.         [ Links ]

10.  NEWMAN, B. E. & STURGIS, M. B. Sources of nitrogen for cotton on Olivier silt loam. Louisiana State University, Agricultural Experimental Station. Report of projects, Department of Agronomy for 1961.         [ Links ]

11.  PADEN, W, R. Responses from varions sources of nitrogen fertilizers. South Carolina Agric. Exp. Sta., 1937. (Bulletin 309).         [ Links ]

 

 

Recebido para publicação em 19 de março de 1965.

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