Resumos
O sorgo granífero, var. TEY 101, foi cultivado em solução nutritiva na presença e ausência de micronutrientes. Foram obtidos sintomas de carência e foi feita a determinação dos teores desses elementos nas folhas.
Grain sorghum var. TEY-101 was grown in nutrient solution in the presence and in the absence of micronutrients. Symptoms of deficieny of all micronutrients were obtained. Growth, as measured by dry matter production was affected by the treatments in the folowing decreasing, order: minus Fe, minus Zn, minus Mn, minus B, minus Mo and minus Cu. An additional treatment in which excess Mn was used revealed a relative tolerance of the variety to high levels of this element. The results of chemical analyses of the leaves suggest that the following contents (in ppm) of micronutrients are associated with the respective deficiencies: B - 20 to 40, Cu - 8 to 10, Fe - 198, Mn - 32 to 35, Mo - 0.5, Zn - 46 to 52; in the case of Fe the Fe/Mn relationship seems to give a better indication of the nutritional status than the content of the element per se, being igual to 1.7 in the healthy plants, and 0.6 in the iron deficient ones.
E. Malavolta; W.R. AccorsiI; G.D. OliveiraI; A.Q. da Silva; H. SilvaI; E.G. QueirogaI; J.C. FelícioI; F.D. NogueiraI; P.A. JahaI; R.M. Del GuiudiceI; V.L. AssisI; A. CardosoI; A.C. RibeiroI; A.K. KatoI; D.A. CordeiroI; A.C.P. AguirreI; A.A. CaetanoI; C.L.C. GarciaII
IRespectivamente: Dep. Química, CENA, Dep. de Botânica e Dep. de Química, E.S.A. "Luiz de Queiroz", USP
IIEstudantes pós graduados de Solos & Nutrição de Plantas
RESUMO
O sorgo granífero, var. TEY 101, foi cultivado em solução nutritiva na presença e ausência de micronutrientes. Foram obtidos sintomas de carência e foi feita a determinação dos teores desses elementos nas folhas.
SUMMARY
Grain sorghum var. TEY-101 was grown in nutrient solution in the presence and in the absence of micronutrients. Symptoms of deficieny of all micronutrients were obtained. Growth, as measured by dry matter production was affected by the treatments in the folowing decreasing, order: minus Fe, minus Zn, minus Mn, minus B, minus Mo and minus Cu. An additional treatment in which excess Mn was used revealed a relative tolerance of the variety to high levels of this element. The results of chemical analyses of the leaves suggest that the following contents (in ppm) of micronutrients are associated with the respective deficiencies: B - 20 to 40, Cu - 8 to 10, Fe - 198, Mn - 32 to 35, Mo - 0.5, Zn - 46 to 52; in the case of Fe the Fe/Mn relationship seems to give a better indication of the nutritional status than the content of the element per se, being igual to 1.7 in the healthy plants, and 0.6 in the iron deficient ones.
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LITERATURA CITADA
Entregue para publicação em 24-11-1977.
- HOAGLAND, D.R. & D.I. ARNON. 1950. The wat er culture method for growing-plants without soil. Calif. Agr. Exp. Sta. Circ. 347.
- HOFFER, G.N. & B.N. KRANTZ. 1951. Deficiency symptoms of corn and small grains. Em: Hunger signs in crops. Ed. por F.E. Bear, David McKay, Nova Iorque.
- JACQUES, G.L., R.L. VANDERLIP & R. ELLIS JR. 1975. Growth and nutrient accumulation and distribution in grain sorghum. II. Zn, Cu, Fe and Mn uptake and distribution. Agron. J. 67: 611-616.
- KRATZ, B.A. & S.W. MELSTED. 1964. Nutrient dieficiencias in corn, sorghum and small grains. Em: Hunger Signs in Crops. Edit, por H.B. Sprague. David Mc Kay Co., Nova Iorque.
- LOCKMAN, R.B. 1972. Mineral composition of grain sorghum plant samples. Par II: As affected by soil acidity, soil fertility, stage of growth variety, climate facors. Comum. Soil Sci. Plant Anal. 3(4): 283-292.
- OHKI, K. 1975. Manganese supply, grown and micronutrient concentration in grain sorghum. Agr. J. 67(1): 328-330.
Estudos sobre a nutrição mineral do sorgo granífero. V. Efeitos das deficiências de micronutrientes (nota)
Datas de Publicação
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Publicação nesta coleção
17 Maio 2012 -
Data do Fascículo
1977
