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.
Conditions affecting the air space: glue ear, ear infection and middle ear effusion. If the middle ear fills with liquid then the conduction of sound through it is reduced and the hearing sound muffled. The middle ear can fill with fluid due to Eustachian tube dysfunction-usually during a cold.