Resumos
Plantas de milho (Pennisetum americanum cv. Bulb 1) forrageiro em condições controladas, foram submetidas a tratamento com solução nutritiva completa e com omissão de B, Cu, Fe, Mn e Zn tendo como objetivo avaliar a produção de matéria seca, a composição química e estabelecer o quadro sintomatológico das deficiências. As produções de matéria seca nos diversos tratamentos não diferiram do tratamento completo e acusaram os seguintes valores em g: tratamento completo 55,9; -B = 48,1; - Cu = 41,8; -Fe = 67,6; -Mn = 63,6 e -Zn = 57,9. Os níveis analíticos encontrados nas folhas novas no tratamento completo e deficiente em ppm foram: B - 145-26; Cu - 0,53 -0,10; Fe - 175-103; Mn - 62-12; Zn -27-12. O quadro sintomatológico das carências foi obtido para todos os micronutrientes estudados, com exceção do manganês.
Seeds of Pennisetum americanum cv Bulk 1 were sowel in pots containing fine quartz and irrigated with demineralized water. Two days after the germination the young plant, three per pod, received complete nutrient solution diluted for 1:15 during 18 days. All the nutrient solutions were purified for the micronutrients content. After these period all pods were irrigated several times a day with demineralized water during 4 days. When the experiment start groups of 12 plants (3 pods) received the complete solution and solutions without one of the micronutrients (-B, -Cu, -Fe, -Mn, -Zn). The solutions were changed every 10 days. After 52 days of the experimental period the plants were collected and divided into items, sheaths new leaves, old leaves and ears. The material was dried to 70°C for several days and analysed by conventional methods. The authors concluded: No differences were observed by the dry matter productions of the plants in the treatments. The analytical levels of the elements in the new leaves of the complete treatment and with omission of the micronutrients were in ppm: B - 145-26; Cu - 0,53-0,10; Fe - 175-103; mn - 62-12; Zn - 27-12. A clear picture was obtained of the mal nutrition symptoms for the micronutrients less than for Mn.
Nutrição mineral de gramíneas tropicais IV. Deficiências de micronutrientes e produção de matéria seca e composição mineral do milheto forrageiro* * Recebido para publicação em 15/04/87.
Mineral nutrition of tropical forage grasses. IV micronutrient deficiencies in milet plants
A.F.S. FrançaI; H.P. HaagII; A.R. DechenII
IDepartamento de Zootecnia da E.V. - UFG. Goiânia, GO
IIDepartamento de Química da E.S.A. "Luiz de Queiroz", USP, Piracicaba, SP
RESUMO
Plantas de milho (Pennisetum americanum cv. Bulb 1) forrageiro em condições controladas, foram submetidas a tratamento com solução nutritiva completa e com omissão de B, Cu, Fe, Mn e Zn tendo como objetivo avaliar a produção de matéria seca, a composição química e estabelecer o quadro sintomatológico das deficiências. As produções de matéria seca nos diversos tratamentos não diferiram do tratamento completo e acusaram os seguintes valores em g: tratamento completo 55,9; -B = 48,1; - Cu = 41,8; -Fe = 67,6; -Mn = 63,6 e -Zn = 57,9. Os níveis analíticos encontrados nas folhas novas no tratamento completo e deficiente em ppm foram: B - 145-26; Cu - 0,53 -0,10; Fe - 175-103; Mn - 62-12; Zn -27-12. O quadro sintomatológico das carências foi obtido para todos os micronutrientes estudados, com exceção do manganês.
SUMMARY
Seeds of Pennisetum americanum cv Bulk 1 were sowel in pots containing fine quartz and irrigated with demineralized water. Two days after the germination the young plant, three per pod, received complete nutrient solution diluted for 1:15 during 18 days. All the nutrient solutions were purified for the micronutrients content. After these period all pods were irrigated several times a day with demineralized water during 4 days. When the experiment start groups of 12 plants (3 pods) received the complete solution and solutions without one of the micronutrients (-B, -Cu, -Fe, -Mn, -Zn). The solutions were changed every 10 days. After 52 days of the experimental period the plants were collected and divided into items, sheaths new leaves, old leaves and ears. The material was dried to 70°C for several days and analysed by conventional methods.
The authors concluded:
No differences were observed by the dry matter productions of the plants in the treatments.
The analytical levels of the elements in the new leaves of the complete treatment and with omission of the micronutrients were in ppm: B - 145-26; Cu - 0,53-0,10; Fe - 175-103; mn - 62-12; Zn - 27-12.
A clear picture was obtained of the mal nutrition symptoms for the micronutrients less than for Mn.
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Full text available only in PDF format.
LITERATURA CITADA
- GALRÃO, E.Z. & LOPES, A.S., 1980. Deficiências nutricionais em solos de cerrado. In: V Simpósio sobre o Cerrado. EMBRAPA-CPAC-CNPq. 760 p.
- MANSELL, R.E. & EMMEL, H.W., 1965. Trace-metal extractions from brine with APDC and oxine. Atomic Absorption Newsletter. vol. 4, nş 10, nov-dec.
- MENGEL, K. & KIRKBY, E.A., 1982. Principles of plant nutrition. International Potash Institute - Bern/ Switzerland.
- SARRUGE, J.R., 1975. Soluções nutritivas. Summa Phytotaphológica, 1:231-233.
- SARRUGE, J.R. & HAAG, H.P., 1972. Análises químicas em plantas. E.S.A. "Luiz de Queiroz"/USP. Piracicaba, SP. 56 p.
Datas de Publicação
-
Publicação nesta coleção
20 Ago 2010 -
Data do Fascículo
1987
Histórico
-
Recebido
15 Abr 1987
