Resumo
During a visit to a farm on December 15, 1980, in the Morro Agudo County of the State of São Paulo, yellow to yellowish patches were observed in about 20 hectares of soybean planted with the cultivar Bossier. Plants that showed symptoms of toxicity were together with plants without symptoms. The symptoms initiated from the third trifoliate leaves upwards. These symptoms were also observed in the neighbouring farms that planted Bossier cultivar. After a period of approximately 20 days the symptoms disappeared. Leaf analysis showed high concentration of Fe in the leaves with symptoms whereas without symptoms the iron concentration was satisfactory. A possible explanation of this toxicity is due to the fact that it rained 439 mm in the month of November when the normal rainfall is 170 mm. With the excess of rainfall iron (III) coumpounds could be reduced to Fe2+ ion which is preferentially absorbed by the plant.
NOTAS
Toxicidade de ferro em soja
Iron toxicity in soybeans
Ondino C. BatagliaI; Hipólito A. A. MascarenhasII, * * Com bolsa de suplementação do CNPq.
ISeção de Química Analítica, e
IISeção de Leguminosas, Instituto Agronômico
SUMMARY
During a visit to a farm on December 15, 1980, in the Morro Agudo County of the State of São Paulo, yellow to yellowish patches were observed in about 20 hectares of soybean planted with the cultivar Bossier. Plants that showed symptoms of toxicity were together with plants without symptoms. The symptoms initiated from the third trifoliate leaves upwards. These symptoms were also observed in the neighbouring farms that planted Bossier cultivar. After a period of approximately 20 days the symptoms disappeared. Leaf analysis showed high concentration of Fe in the leaves with symptoms whereas without symptoms the iron concentration was satisfactory. A possible explanation of this toxicity is due to the fact that it rained 439 mm in the month of November when the normal rainfall is 170 mm. With the excess of rainfall iron (III) coumpounds could be reduced to Fe2+ ion which is preferentially absorbed by the plant.
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Full text available only in PDF format.
Recebido para publicação a 13 de março de 1981.
- 1. BATAGLIA. O. C.; TEIXEIRA, J. P. F.; FURLANI, P. R.; FURLANI, A. M. C.; GALLO, J. R. Métodos de análise química de plantas. Campinas, Instituto Agronômico, 1978. 31p. (Circular, 87)
- 2. BOHN, H. L.; McNEAL, B. L.; O'CONNOR, G. A. Soil chemistry. New York, John Wiley, 1979. 329p.
- 3. BROWN, J. C. & JONES, W. E. Manganese and iron toxicities dependent on soybean variety. Communications in Soil Science and Plant Analysis, 8:1-15, 1977.
- 4. OHLROGGE, A. J. & KAMPRATH, E. J. Fertilizer use on soybeans. In: NELSON L. B., ed. Changing patterns in fertilizer use. Madison, Soil Sci. Soc. Amer., 1968. p.273-298.
- 5. RAIJ, B. van & ZULLO, M. A. T. Métodos de análise do solo para fins de fertilidade. Campinas, Instituto Agronômico, 1977. 16p. (Circular, 63)
Datas de Publicação
-
Publicação nesta coleção
15 Dez 2007 -
Data do Fascículo
1981
Histórico
-
Recebido
13 Mar 1981
