Soil tillage, water erosion and calcium, magnesium and organic carbon losses
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Soil tillage, water erosion and calcium, magnesium and organic carbon lossesTítulo(s) alternativo(s)
Preparado do solo, erosao hídrica, e perdas de cálcio, magnésio e carbono orgânicoAutor(es)
Data
2005Cita bibliográfica
Scientia agricola, 2005, vol. 62, nº. 6, p. 578-584
Resumo
[Abstract] Soil tillage influences water erosion, and consequently, losses of calcium, magnesium and
organic carbon in surface runoff. Nutrients and organic carbon are transported by surface runoff in particulate
form, adsorbed to soil colloids or soluble in water, depending on the soil tillage system. This study was
carried out on an Inceptisol, representative of the Santa Catarina highlands, southern Brazil, between November
1999 and October 2001, under natural rainfall. The soil tillage treatments (no replications) were: no-tillage
(NT), minimum soil tillage with chiseling + disking (MT), and conventional soil tillage with plowing + two
diskings (CT). The crop cycles sequence was soybean (Glycine max), oats (Avena sativa), beans (Phaseolus
vulgaris) and vetch (Vicia sativa). Conventional soil tillage treatment with plowing + two disking in the
absence of crops (BS) was also studied. Calcium and magnesium concentrations were determined in both
water and sediments of the surface runoff, while organic carbon was measured only in sediments. Calcium
and magnesium concentrations were greater in sediments than in surface runoff, while total losses of these
elements were greater in surface runoff than in sediments. The greatest calcium and magnesium concentrations
in surface runoff were obtained under CT, while in sediments the greatest concentration occurred under MT.
Organic carbon concentration in sediments did not differ under the different soil tillage systems, and the
greatest total loss was under CT system.
Palabras chave
Runoff
Sediment
Nutrient in runoff
Nutrient in sediments
Nutrient losses
Sediment
Nutrient in runoff
Nutrient in sediments
Nutrient losses
Versión do editor
ISSN
0103-9016
1678-992X
1678-992X