Data/hora: 23/06/2024 19:50:26

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: | --
Registro original: | Embrapa Cerrados (CPAC)

Exemplares:

CPAC - (5435-1) - UPC - FL - -- - CRI2340 -  - CRI2340 - DIS
CPAA - (16848-1) - ADD - FL - -- - FOL9116 -  - FOL9116 - DIS
CPAF-RR - (11665-1) - ADD - FL - -- - SOLOS - 059 -  - SOLO - 059 - DIS