254 SOILS AND FERTILIZERS 



average yield of wheat in those counties in Minnesota 

 where live stock is kept, is 7 bushels per acre greater 

 than in similar counties where all grain farming is 

 followed. 



Problems 



Calculate the income and outgo of fertility from the following 

 farms : 



1. Sold from the farm : wheat 40 acres, oats 40 acres, barley 40 

 acres, rye 20 acres, flax 10 acres. The straw is burned and no use 

 is made of any manures. 



2. Sold from the farm : wheat 20 acres, barley 20 acres, flax 5 

 acres, 1000 pounds of butter, 10 hogs, and 10 steers. Purchased : 

 Bran 3 tons, shorts 2 tons, oil meal 1 ton. Crops produced and fed 

 on farm : Clover and timothy hay 40 tons, corn fodder 3 acres, corn 

 10 acres, oats and peas 10 acres, roots 1 acre, millet 1 acre, and bar- 

 ley 5 acres. 



3. Sold from the farm : Wheat 10 acres, sugar beets 5 acres, milk 

 100,000 pounds, butter 500 pounds, 20 pigs, 6 head of young stock, 

 2 acres of potatoes. Purchased : 5 tons of bran, 2 tons of oil meal, 

 1 ton of cottonseed meal, 15 cords of wood, 1 ton of acid phosphate, 

 1000 pounds of potassium sulphate, and 500 pounds of sodium ni- 

 trate. Raised and consumed on the farm : Corn fodder 15 acres, 

 mangels 1 acre, peas and oats 5 acres, clover 20 tons, timothy 10 

 tons, straw from grain sold, oats, 10 acres, corn 20 acres. 



