Evolution du front wuotidien du dessechemet des sols apres une pluie

Abstract

Farm machinery cost is among the most important factors that influence increases in crop production. Therefore, it is essential to discriminate those that are really needed, instead of choosing just by chance.
Unfortunately, data needed to determine the really needed machines such as the available time for field operations in local soil conditions, is not yet available. The available time depends largely on the daily
soil drying out front profile after each rain. It calls "the daily soil drying out front profile" the depth of the soil which is drying out day by day after a rainfall. The numerous works on the soil drying out after a
rainfall showed that no one did not describe this front. Then our study was designed to determine it. The results showed that, whatever the amount of rainfall and subsequent sunshine, a) the soil drying out does not depend on its type; b) when the interval between two consecutive rainfalls is over 3 days, the daily drying out front profile of all types of soils is on average 0.70 to 1 cm/day; c) when the interval between two consecutive rainfalls is less than 3 days, it is almost null: 0,1 cm/day.