Why Worry About Old MacDonald?
Old MacDonald has some big decisions to make. In this exercise, you will help him decide how much fertilizer his crops need. At the same time you will help him to keep costs down and prevent nutrient runoff into nearby lakes and streams. Verse 1: Old MacDonald had a farm. . . E-I-E-I-O And on this farm he had 900 chickens. . . E-I-E-I-O with a cluck-cluck here and a cluck-cluck there, here a cluck, there a cluck, everywhere a cluck-cluck Old MacDonald had a farm. . . E-I-E-I-O Verse 2: And on this farm he had 10 pigs Verse 3: And on this farm he had 12 cows Old MacDonald has a small farm. The cows graze in a 15-acre pasture, and he grows corn to feed his chickens, pigs, and cows in a 35-acre field. Altogether, Old MacDonald’s animals produce about 170 tons of manure every year! That manure contains 1,200 pounds of nitrogen and 800 pounds of phosphorus. Old MacDonald knows that manure is an unbalanced fertilizer for corn because it has too much phosphorus and not enough nitrogen. Corn p
