|
|
|
|
| |
|
|
| Araújo,Suzana Romeiro; Demattê,José Alexandre Melo; Garbuio,Fernando José. |
| Com a correção da acidez, nutrientes importantes para o cultivo do milho tornam-se mais disponíveis à planta, promovendo o aumento de produtividade. Objetivou-se com este estudo avaliar as alterações químicas ocorrentes em dois solos e na produção de matéria seca de milho pela aplicação de corretivos com diferentes graus de reatividade. Foi realizado um primeiro experimento em casa de vegetação, aplicando-se doses de três calcários comerciais, sendo um com reatividade média, denominado A (RE = 85,7 %; PRNT = 88,3 %), outro com reatividade baixa denominado B (RE = 83,7 %; PRNT = 76,2 %), e outro, denominado C (RE = 99,1 %; PRNT = 105,3 %) altamente reativo, em quatro cultivos sucessivos de milho. Os solos utilizados foram Neossolo Quartzarênico e Latossolo... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Calagem; Efeito residual; Zea mays. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832009000600024 |
| |
|
|
| Pereira,Bruno Fernando Faria; Rozane,Danilo Eduardo; Araújo,Suzana Romeiro; Barth,Gabriel; Queiroz,Rafaela Josemara Barbosa; Nogueira,Thiago Assis Rodrigues; Moraes,Milton Ferreira; Cabral,Cleusa Pereira; Boaretto,Antonio Enedi; Malavolta,Eurípedes. |
| Among the toxic elements, Cd has received considerable attention in view of its association with a number of human health problems. The objectives of this study were to evaluate the Cd availability and accumulation in soil, transfer rate and toxicity in lettuce and rice plants grown in a Cd-contaminated Typic Hapludox. Two simultaneous greenhouse experiments with lettuce and rice test plants were conducted in a randomized complete block design with four replications. The treatments consisted of four Cd rates (CdCl2), 0.0; 1.3; 3.0 and 6.0 mg kg-1, based on the guidelines recommended by the Environmental Agency of the State of São Paulo, Brazil (Cetesb). Higher Cd rates increased extractable Cd (using Mehlich-3, Mehlich-1 and DTPA chemical extractants) and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Lactuca sativa L.; Oryza sativa L.; Soil pollution; Chemical extractants; Heavy metals; Human health. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832011000200033 |
| |
|
| |
|
|
| Blum,Julius; Giarola,Neyde Fabíola Balarezo; Silva,Álvaro Pires da; Guedes Filho,Osvaldo; Silva,Sâmala Glícia Carneiro; Eberhardt,Diogo Néia; Araújo,Suzana Romeiro. |
| In no-till systems, two different soil conditions are created during the sowing operation: row and inter-row positions. The objectives of this study were to evaluate, using static and dynamic soil attributes, the influence of no-till sowing operation on creating better physical environment for soybean crop growth. A field transect with clay content ranging from 150 to 400 g kg-1 was selected in Ponta Grossa, Paraná State, Brazil, from a Typic Hapludox that has been cultivated under no-till system for 16 years. After soybean harvest, 68 undisturbed soil samples were collected at both sowing row and inter-row positions. The following soil properties were evaluated: saturated hydraulic conductivity, air permeability, bulk density, total porosity, soil... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil physical quality; Soil conservation tillage; Soil compaction; Air permeability; Saturated hydraulic conductivity. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902014000500004 |
| |
|
|
|
