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| Chiba, Marcio Koiti; IAC; Natale, William; UNESP; Cruz, Mara Cristina Pessôa da; UNESP; Teixeira, Luiz Antonio Junqueira; IAC; Centurion, José Frederico; UNESP. |
| Este trabalho teve por objetivo estudar a distribuição de formas não-trocáveis de potássio, em frações texturais de um Latossolo cultivado com bananeira, por dois anos, em dois regimes hídricos (parcelas principais), e doses de potássio (0, 300, 600 e 900 kg há-1) (subparcelas), seguindo delineamento em blocos casualizados, com parcelas subdivididas. Verificou-se que os maiores teores de potássio (trocável e não-trocável) estão contidos nas frações mais finas: argila e silte. Neste sistema de cultivo e com a aplicação dos adubos na superfície, a movimentação do nutriente, nas camadas estudadas, esteve associada à presença e movimentação da água no perfil do solo. A irrigação desempenhou papel relevante na distribuição das formas do K. Nas parcelas... |
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Palavras-chave: 5.01.00.00-9 Agronomia irrigação; Argila; Silte; Areia; K-trocável; K não-trocável. irrigation; Clay; Silt; Sand; Exchangeable K; Non-exchangeable K. |
| Ano: 2008 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/5321 |
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| Volf,Marcelo Raphael; Guimarães,Tiara Moraes; Scudeletti,Daniele; Cruz,Igor Vilela; Rosolem,Ciro Antonio. |
| ABSTRACT: Ruzigrass (Urochola ruziziensis) has a large capacity to take up K from the soil, including non-exchangeable forms, and can play an important role in nutrient cycling in integrated production systems. However, K transport to roots of brachiarias is not well known, nor the nutrient dynamics in the rhizosphere, where a concentration gradient may be established towards the non-rhizospheric soil, creating a favorable environment for the release of non-exchangeable K. This study aimed to evaluate the effect of ruzigrass on K dynamics in the rhizosphere and on non-exchangeable K release. Ruzigrass was grown in pots filled with a Latossolo Vermelho Amarelo (Typic Hapludox) that was collected at 0.00-0.20 and 0.20-0.60 m layer from a cultivated area and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Urochloa ruziziensis; Non-exchangeable K; Exchangeable K; Rhizospheric soil. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832018000100531 |
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| Steiner,Fábio; Lana,Maria do Carmo. |
| ABSTRACT Intense cropping of plants in pots was used to assess the contribution of non-exchangeable K to plant uptake in different soils of Paraná State, Brazil. Surface samples from nine soil types were fertilized or not with K fertilizer and subjected to six successive cropping (i.e., soybean, pearl millet, wheat, common beans, soybean and maize) under greenhouse conditions. The crops were grown in 8-L pots for 45 days, and at the end of the sixth cropping, the soil was sampled to determination non-exchangeable and exchangeable K. Shoot dry matter yield, K taken up, non-exchangeable pool contribution to K nutrition of plants were also determined. Soils differ in the ability to K supply to the plants in the short to medium term, due to the wide range of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Successive cropping of plants; Soil potassium budget; Exchangeable K; Potential buffer capacity of K. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902018000400547 |
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