Data/hora: 01/06/2024 06:43:00

Biblioteca(s): | Embrapa Unidades Centrais.
Data corrente: | 25/06/2003
Data da última atualização: | 25/10/2018
Autoria: | ROSOLEM, C. A.; SILVA, R. H. da; ESTEVES, J. A. de F.
Afiliação: | Ciro Antonio Rosolem, Universidade Estadual Paulista - Unesp/Faculdade de Ciências Agronômicas/Departamento de Produção Vegetal; Rosemeire Helena da Silva, Universidade Estadual Paulista - Unesp/Faculdade de Ciências Agronômicas/Departamento de Produção Vegetal; José Antonio de Fátima Esteves, Universidade Estadual Paulista - Unesp/Faculdade de Ciências Agronômicas/Departamento de Produção Vegetal.
Título: | Potassium supply to cotton roots as affected by potassium fertilization and liming.
Ano de publicação: | 2003
Fonte/Imprenta: | Pesquisa Agropecuária Brasileira, Brasília, DF, v. 38, n. 5, p. 635-641, maio 2003
Idioma: | Inglês
Notas: | Título em português: Suprimento de potássio a raízes de algodoeiro em razão da adubação potássica e calagem.
Conteúdo: | Cotton (Gossypium hirsutum) is known to have a high requirement for K and to be very sensitive to low soil pH. Most of K reaches plant roots by diffusion in the soil. As K interacts with Ca and Mg, liming can interfere in K movement in the soil, affecting eventually the plant nutrition. The objective of this work was to study the effect of dolomitic lime and 0, 15, 30, 45 and 60 g kg-1 of K on the supply of K to cotton roots. Cotton plants were grown up to 40 days in 5 L pots containing a Dark Red Latosol (Typic Haplusthox) with 68% and 16% of sand and clay, respectively. There was an increase in dry matter yields and in K accumulation due to K fertilization. Root interception of soil K was also increased by K application, but was not affected by lime. Mass flow and diffusion increased linearly with K levels up to 60 mg kg-1, in pots with lime. In pots without lime the amount of K reaching the roots by diffusion increased up to 45 mg kg-1, but decreased at the highest K level. Accordingly, there was more K reaching the roots through mass flow at the highest K level. This happened because there were more fine roots in pots without lime, at the highest K level. As the roots grew closer, there was a stronger root competition leading to a decrease in the amount of K diffused to cotton roots.
Palavras-Chave: | correção calcária; difusão; growth.
Thesagro: | Crescimento; Gossypium Hirsutum; Massa; Nutrição Vegetal; Raiz.
Thesaurus Nal: | diffusion; liming materials; mass; plant nutrition; roots.
Categoria do assunto: | --
URL: | http://ainfo.cnptia.embrapa.br/digital/bitstream/AI-SEDE/24590/1/v38n5_635.pdf
Registro original: | Embrapa Unidades Centrais (AI-SEDE)
Exemplares: | AI-SEDE - (24590-1) - UPE - AP - PP - 630.72081 - P474 -  - DIS