3 3. a A farmer applies 714 lbs (NH4)2SO4 fertilizer (21-0-0-248) per acre to a field and has a corn grain yield of 180 bu/acre and a corn silage dry matter yield of 9 tons/acre. An untreated area nearby has a corn grain yield of 100 bu/acre and silage yield of 8 tons per acre. If the corn silage of the fertilized area has an N content of 1.8% and the untreated area has an N content of 1.6%, calculate: A Partial factor productivity for the grain B Apparent N recovery efficiency of the crop. 3 3. a A farmer applies 714 lbs (NH4)2SO4 fertilizer (21-0-0-248) per acre to a field and has a corn grain yield of 180 bu/acre and a corn silage dry matter yield of 9 tons/acre. An untreated area nearby has a corn grain yield of 100 bu/acre and silage yield of 8 tons per acre. If the corn silage of the fertilized area has an N content of 1.8% and the untreated area has an N content of 1.6%, calculate: A Partial factor productivity for the grain B Apparent N recovery efficiency of the crop