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| Bazaglia Filho,Osmar; Rizzo,Rodnei; Lepsch,Igo Fernando; Prado,Hélio do; Gomes,Felipe Haenel; Mazza,Jairo Antonio; Demattê,José Alexandre Melo. |
| Since different pedologists will draw different soil maps of a same area, it is important to compare the differences between mapping by specialists and mapping techniques, as for example currently intensively discussed Digital Soil Mapping. Four detailed soil maps (scale 1:10.000) of a 182-ha sugarcane farm in the county of Rafard, São Paulo State, Brazil, were compared. The area has a large variation of soil formation factors. The maps were drawn independently by four soil scientists and compared with a fifth map obtained by a digital soil mapping technique. All pedologists were given the same set of information. As many field expeditions and soil pits as required by each surveyor were provided to define the mapping units (MUs). For the Digital Soil Map... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil cartography; Detailed soil survey; Remote sensing; Soil-landscape relationship. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832013000500003 |
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| Cunha,Pedro; Marques Júnior,José; Curi,Nilton; Pereira,Gener Tadeu; Lepsch,Igo Fernando. |
| Em um segmento de vertente com substrato de arenito em contato com basalto, regionalmente muito freqüente, pretendeu-se não só relacionar as superfícies geomórficas com os atributos físicos, químicos e mineralógicos dos Latossolos nelas encontrados, mas também testar métodos geoestatísticos para localização de limites dessas superfícies. Usando critérios geomorfológicos, três superfícies foram identificadas e topograficamente caracterizadas. Os solos foram amostrados, a intervalos regulares de 25 m, na profundidade de 0,6 a 0,8 m (topo do horizonte B), em uma transeção de 1.700 m perfazendo 109 pontos. Nas amostras, foram analisados: densidade de partículas, granulometria, CTC do solo, CTC da argila, Fe total da argila (ataque por H2SO4) e óxidos de Fe... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Superfícies geomórficas; Relações solo-paisagem; Variabilidade espacial; Geoestatística; Split moving windows dissimilarity analysis. |
| Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832005000100009 |
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| Lepsch,Igo Fernando; Silva,Nelson Machado da; Espironelo,Ademar. |
| In the plow layer (0-20cm) of well drained low activity clay soils (mostly Oxisols and Ultisols) under "Cwa" tropical climate and long term cropped with cotton (42 sites) or sugarcane (45 sites), organic matter (y) was found to be similarly and highly related to soil texture. Best relations were found with clay (<2µ) plus silt (2-20µ) contents (x); (y = 0.773 + 0.0325x; r = 0.810***). A classification of soil organic matter contents, into low, medium and high levels, with different values for four major textural Classes is suggested. Ranges of medium levels of organic matter suggested were: 0.6 to 1.2% for sand and sandy loam; 1.0 to 1.8% for sandy loam and sandy clay loam; 1.5 to 2.8% for sandy clay and clay; 2.4 to 3.8% for heavy clay. |
| Ano: 1982 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87051982000100027 |
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