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.
The Eustachian tube also drains fluid out of the middle ear. When this tube becomes blocked, and air and fluid cannot flow freely, pressure builds in the ear, causing pain. If fluid behind the eardrum becomes infected with a virus or bacteria, it causes a middle ear infection that can lead to pain and fever.