Open-access Relationship of rainfall-erosion losses in different soils of the state of São Paulo

Data on rainfall, soil erosion and water losses from runoff plots were recorded for a 10-year period in four experiment stations, Campinas, Ribeirão Prêto, Pindorama, and Mococa. Correlation studies were made between the soil and water losses, and total rainfall; also, the data were examined in relation to the 5, 15, 30, and 60-minute rain intensity in millimeters per hour. Rainfall intensity and distribution influenced the intensity and total volume of soil and water losses induced by erosion. However, no definite relationship could be established based on the collected data. It is suggested that future studies, including determinations of soil humidity prior to rains (API - Antecedent Precipitation Index), rainfall duration and kinetic energy of rainfall drops, might show a clearer relationship.


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Instituto Agronômico de Campinas Avenida Barão de Itapura, 1481, 13020-902, Tel.: +55 19 2137-0653, Fax: +55 19 2137-0666 - Campinas - SP - Brazil
E-mail: bragantia@iac.sp.gov.br
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