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.
Common Cold. A viral infection of the nose is the most common cause. The nasal congestion also blocks the ear tube eustachian tube. The ear tube normally keeps air in the middle ear. Ear Infection. Middle ear pus can also cause muffled hearing on that side. This commonly happens with an ear infection. Middle Ear Fluid.