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Registro Completo |
Biblioteca(s): |
Embrapa Amazônia Ocidental; Embrapa Cerrados; Embrapa Roraima. |
Data corrente: |
26/04/1993 |
Data da última atualização: |
26/04/1993 |
Autoria: |
RITCHEY, K. D. |
Título: |
Potassium fertility in oxisols and ultisols of the humid tropics. |
Ano de publicação: |
1979 |
Fonte/Imprenta: |
Ithaca, N.Y.: Cornell University, 1979. |
Páginas: |
44p. |
Série: |
(Cornell International Agriculture. Bulletin, 37). |
Idioma: |
Inglês |
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(...) |
Palavras-Chave: |
Brasil; Latossolo vermelho-escuro; Regiao Central. |
Thesagro: |
Adubação; Cerrado; Fertilidade do Solo; Lixiviação; Potássio. |
Categoria do assunto: |
-- |
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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Registro original: |
Embrapa Cerrados (CPAC) |
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Registros recuperados : 58 | |
2. | | RITCHEY, K. D. N fertilization. In: AGRONOMIC-ECONOMIC RESEARCH ON SOILS OF THE TROPICS. 1978-1979 report. Raleigh, N.C.:, North Carolina State University, 1980. p.61-65.Biblioteca(s): Embrapa Cerrados. |
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5. | | COUTO, W.; RITCHEY, K. D. Enxofre. Planaltina: EMBRAPA-CPAC, 1983. Trabalho apresentado no Seminario "Imposto das relacoes solo-agua-clima-planta na agricultura de sequeiro dos cerrados".Biblioteca(s): Embrapa Cerrados. |
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6. | | COUTO, W.; RITCHEY, K. D. Enxofre. In: GOEDERT, W. J. (Ed.). Solos dos cerrados: tecnologias e estratégias de manejo. Planaltina, DF: EMBRAPA-CPAC; São Paulo: Nobel, 1986. p. 223-235.Biblioteca(s): Embrapa Cerrados. |
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11. | | 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 : 58 | |
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