Contour plowing, Pennsylvania, 1938. Contour bunding, Catalonia, 2007. Contour ploughing or contour farming or Contour bunding is the farming practice of plowing and/or planting across a slope following its elevation contour lines.
1 recurring middle ear infections.  Fluid in the ear may be accompanied by signs and symptoms of allergies or an upper respiratory infection including congestion, runny nose, post nasal drip, or watery eyes.
When there is an infection in middle ear, it may cause problems with the eardrum thereby leading to retraction. The presence of fluid in ears or otitis media with effusion or discharge may result to retraction of eardrum.