Soil tillage, water erosion, and calcium, magnesium and organic carbon losses

Scientia Agricola

Ildegardis Bertol²  Jean Cláudio Guadagnin²  Antonio Paz González¹  André Júlio Do Amaral²  Leonardo Felipe Brignoni² 

[1] ,UDESC Depto. de Solos Lages SC ,Brasil

关键词: runoff;    sediment;    nutrient in runoff;    nutrient in sediments;    nutrient losses;    enxurrada;    sedimentos;    nutrientes na enxurrada;    nutrientes nos sedimentos;    perdas de nutrientes;   

DOI  :  10.1590/S0103-90162005000600011

来源: SciELO

【 摘 要 】

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.

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