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| Souza,Kleberson Worslley de; Lima,Hedinaldo Narciso; Schaefer,Carlos Ernesto G.R.; Teixeira,Wenceslau Geraldes; Pulrolnik,Karina; Corrêa,Guilherme Resende. |
| Despite the agricultural importance of Indian Black Earth (IBE) in the Amazon region, there are few studies that report on the relation between soil texture and chemical fertility of IBE. These soils of pre-Colombian origin, with high contents of P, Ca and other nutrients are found across the Amazon valley. IBE profiles were studied to evaluate the total contents of P, its primary chemical forms and the P transformation phases in areas with IBE soils of variable texture and in adjacent reference soils. The soil texture strongly influenced soil fertility, changing in terms of transformation of the primary P forms and, consequently, predominant P forms in IBE. Soils with texture varying between clay and heavy clay had higher total P contents and primary Ca-P... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Amazon Black Earth; Soil P fractionation; Upland soils; Manacapuru; Amazon soils; Anthropogenic soils. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832009000500027 |
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| Soltangheisi,Amin; Santos,Valdevan Rosendo dos; Franco,Henrique Coutinho Junqueira; Kolln,Oriel; Vitti,André Cesar; Dias,Carlos Tadeu dos Santos; Herrera,Wilfrand Ferney Bejarano; Rodrigues,Marcos; Soares,Thais de Marchi; Withers,Paul John Anthony; Pavinato,Paulo Sergio. |
| ABSTRACT: The use of mineral phosphate fertilizers associated with organic residues can improve fertilizer use efficiency and consequently decrease their usage costs. Soil application of filter cake (FC) can provide nutrients and enhance physical quality. This study aimed to evaluate the effects of different phosphate fertilizers [rock phosphate (RP) and triple superphosphate (TSP)] applied at different rates (90 and 180 kg ha-1 P2O5) associated with filter cake (10 Mg ha-1 dry matter) on the soil phosphorus (P) fractions after two consecutive seasons of sugarcane in two distinct soils, sandy and clayey. Yield was significantly improved with FC addition in the first year in both soils, while inorganic P sources did not influence crop yield at either... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Reactive phosphate; P solubility; Soil P fractionation; Organic waste. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832019000100519 |
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