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| Registros recuperados : 71 | |
| 18. |  | RITCHEY, K. D.; SOUSA, D. M. G. Use of gypsum in management of subsoil acidity in Oxisols. In: MONIZ, A.C.; FURLANI, A.M.C.; SCHAFFERT, R.E.; FAGERIA, N.K.; ROSOLEM, C.A.; CANTARELLA, H., ed. Plant-soil interactions at low pH: sustainable agriculture and forestry production. Campinas: Brazilian Soil Science Society, 1997. p.165-178. Trabalho apresentado no "Fourth International Symposium on Plant-Soil Interactions at low pH, Belo Horizonte, MG, Brazil, Mar. 1996."| Biblioteca(s): Embrapa Cerrados. |
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| Registros recuperados : 71 | |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Cerrados. Para informações adicionais entre em contato com cpac.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Cerrados. |
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Data corrente: |
26/04/1993 |
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Data da última atualização: |
26/04/1993 |
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Autoria: |
RITCHEY, K. D. |
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Título: |
Potassium fertility in oxisols and ultisols of the humid tropics. |
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Ano de publicação: |
1979 |
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Fonte/Imprenta: |
Ithaca, N.Y.: Cornell University, 1979. |
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Páginas: |
44p. |
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Série: |
(Cornell International Agriculture. Bulletin, 37). |
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Idioma: |
Inglês |
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Conteúdo: |
It is possible to study the fate of potassium fertilizer in highly weathered acid soils of the tropics because low amounts of potassium-fixing and potassium-releasing minerals are present. Potassium that is not leached or removed from the field in harvested material remains available on the soil exchange complex. On a Dark Red Latosol in Central Brazil, leaching began to occur only with the addition of 300 kg/ha K as KCl, which is well above the recommemded rate. The potassium content measured in grain crops varied with K status of the soil, from 1,4 percent to 1.9 percent in soybean and 0.23 percent to 0.39 percent in maize. The amount of K that will be exported from the field as grain is easily calculated, and at least this amount of K must be returned to the soil yearly in order to maintain production. If the stover is also removed, its K content should be taken into account as well. Forages removed from the field may contain 1 percent to 3 percent K on a dry-mattrer basis(...) |
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Palavras-Chave: |
Brasil; Latossolo vermelho-escuro; Regiao Central. |
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Thesagro: |
Adubação; Cerrado; Fertilidade do Solo; Lixiviação; Potássio. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01628nam a2200229 a 4500
001 1548450
005 1993-04-26
008 1979 bl uuuu u0uu1 u #d
100 1 $aRITCHEY, K. D.
245 $aPotassium fertility in oxisols and ultisols of the humid tropics.
260 $aIthaca, N.Y.: Cornell University$c1979
300 $a44p.
490 $a(Cornell International Agriculture. Bulletin, 37).
520 $aIt is possible to study the fate of potassium fertilizer in highly weathered acid soils of the tropics because low amounts of potassium-fixing and potassium-releasing minerals are present. Potassium that is not leached or removed from the field in harvested material remains available on the soil exchange complex. On a Dark Red Latosol in Central Brazil, leaching began to occur only with the addition of 300 kg/ha K as KCl, which is well above the recommemded rate. The potassium content measured in grain crops varied with K status of the soil, from 1,4 percent to 1.9 percent in soybean and 0.23 percent to 0.39 percent in maize. The amount of K that will be exported from the field as grain is easily calculated, and at least this amount of K must be returned to the soil yearly in order to maintain production. If the stover is also removed, its K content should be taken into account as well. Forages removed from the field may contain 1 percent to 3 percent K on a dry-mattrer basis(...)
650 $aAdubação
650 $aCerrado
650 $aFertilidade do Solo
650 $aLixiviação
650 $aPotássio
653 $aBrasil
653 $aLatossolo vermelho-escuro
653 $aRegiao Central
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