| Texto completo | |
| Autor(es): |
Firmano, Ruan Francisco
[1]
;
Melo, Vander de Freitas
[2]
;
de Oliveira Junior, Adilson
[3]
;
de Castro, Cesar
[3]
;
Ferracciu Alleoni, Luis Reynaldo
[1]
Número total de Autores: 5
|
| Afiliação do(s) autor(es): | [1] Univ Sao Paulo ESALQ USP, Luiz de Queiroz Coll Agr, Soil Sci Dept, Av Padua Dias 11, BR-13418000 Piracicaba, SP - Brazil
[2] Fed Univ Parana UFPR, Dept Soils & Agr Engn, R Funcionarios 1540, BR-80035050 Curitiba, Parana - Brazil
[3] Brazilian Agr Res Corp Embrapa, Soybean Natl Ctr, Rod Carlos Joao Strass, BR-86001970 Londrina, Parana - Brazil
Número total de Afiliações: 3
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Soil Science Society of America Journal; v. 83, n. 6, p. 1819-1829, NOV-DEC 2019. |
| Citações Web of Science: | 0 |
| Resumo | |
Lack of potassium (K) fertilization can affect the nutrient reserve in soil and soybean {[}Glycine max (L.) Merrill] yield in humid tropical agroecosystems. The effects of K management in soil K pools and soybean nutrition is best evaluated by taking samples from long-term experiments. The aim of this study was to investigate changes in K pools and soybean nutrition as a result of K fertilizer deprivation in an Oxisol under no-till. Soil samples were collected in a field experiment started in 1983 in southern Brazil. Non-exchangeable K contents were extracted by boiling HNO3, whereas exchangeable K contents were extracted by Mehlich-1 and ion exchange resin. Grain yields and K contents in grains and index leaves (trifoliolate leaflets) were also obtained. Potassium fertilizer deprivation restricted soybean yield and reduced exchangeable K in a nonlinear fitting. The total K contents were influenced by K rates, without effects by K application. The 1 M HNO3 solution had high positive correlations with exchangeable K extractants, K leaf, and K grain contents. However, the exchangeable K extractants were better for interpreting the results due to higher correlations with yield and superior sensitivity to K application after deprivation. Potassium applications influenced K removals by soybeans and K leaf contents. The results indicate that long-term K management has effects on stable K pools (non-exchangeable and total K) and highlights that the buffer capacity of exchangeable K was strongly related to these stable pools. This underscores the importance of avoiding a negative K balance in soybean production systems to conserve K reserves and exchangeable forms. (AU) | |
| Processo FAPESP: | 15/18952-3 - Efeito residual da adubação potássica nas formas do nutriente no solo |
| Beneficiário: | Ruan Francisco Firmano |
| Modalidade de apoio: | Bolsas no Brasil - Mestrado |