Data/hora: 09/06/2024 14:41:38

Provedor de dados: | 90
País: | Brazil
Título: | Does Ferralsol Clay Mineralogy Maintain Potassium Long-Term Supply to Plants?
Autores: | Moterle,Diovane Freire; Bortoluzzi,Edson Campanhola; Kaminski,João; Rheinheimer,Danilo dos Santos; Caner,Laurent.
Data: | 2019-01-01
Ano: | 2019
Palavras-chave: | Potassium forms; K fertilization; Non-exchangeable K; 2:1 clay minerals; X-ray diffraction.
Resumo: | ABSTRACT Ferralsols ( Latossolos ) should contain few or no 2:1 clay minerals and have low potassium (K) contents, and consequently low levels of non-exchangeable K forms are expected. The aim of this study was to evaluate how the clay mineralogy of a Ferralsol affects the soil K dynamics in response to K fertilization during cropping and whether the clay mineralogy was altered due to successive crops and K fertilization. A tropical Brazilian Ferralsol under field conditions was sampled (0.00-0.20 m) in contrasting K fertilization plots: no K application (control plot) and 3,200 kg ha-1 applied K2O fertilizer. These two treatments were submitted at eight different crop cycles, performed in pots under greenhouse conditions, and fertilized with 0, 30, and 90 mg kg-1 K2O before each crop cycle. The biomass K, exchangeable K, non-exchangeable K, and structural K contents were determined after each crop cycle. At the end of the experiment, the presence of 2:1 clay minerals with hydroxy-aluminum interlayered in the soil clay fraction was verified, which ensured K adsorption in a form available to plants when K fertilizer was added. Cropping without K fertilization resulted in limited crop yields and exhausted the exchangeable and non-exchangeable K soil reserves. The previous K fertilization history influenced the soil K reserve and its availability to plants in the Ferralsol studied. The crops without K addition decreased the proportion of 2:1 hydroxy-Al interlayer minerals in the soil in relation to the kaolinite clay minerals.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832019000100512
Editor: | Sociedade Brasileira de Ciência do Solo
Relação: | 10.1590/18069657rbcs20180166
Formato: | text/html
Fonte: | Revista Brasileira de Ciência do Solo  v.43 2019
Fonte: | info:eu-repo/semantics/openAccess