YIELD WITH ROCK PHOSPHATE FOR SEVEN YEARS. 



1915 Corn . 



1916 Corn . 



1917 Corn ., 



1918 Corn . 



1919 Corn . 



1920 Corn . , 



Total 



1921 Corn . . 



1915 Oats . . 



1916 Oats . . 



1917 Oats . . 



1918 Oats . 



1919 Oats .. 



1920 Oats .. 



Total 



1921 Oats . . 



1915 Wheat 



1916 Wheat 



1917 Wheat 



1918 Wheat 



1919 Wheat 



1920 Wheat 



Total 



1921 Wheat 



Bushels. 

 6,710 

 6,100 

 5,780 

 9,075 

 6,050 

 8,100 



Average 

 bushels 

 per acre. 



55 



50 



63 



55 



55 



45 



791 



118 

 25 

 57 



100 

 80 

 80 

 70 



412 



130 



136 



64 



60 



70 



155 



80 



565 

 54 



41,815 Net 52 



4,720 

 1,900 

 3,041 

 6,300 

 3,600 

 3,200 

 3,010 



40 

 76 

 53 

 63 

 45 

 40 

 43 



51 



21,051 Net 51 



6,500 

 4,692 

 1,536 

 1,590 

 2,660 

 3,255 

 1,760 



15,493 

 2 172 



50 

 34 

 24 

 26 

 38 

 21 

 22 



Net 27 

 40 



28 



In these tables are given the yields without phosphorus for six years, 

 1906-11, inclusive, for corn and oats and five years for wheat. And then 

 the yields with phosphorus for seven years, 1915-1921, inclusive, having 

 tabulated the first six years together and then adding the seventh, in order 

 to make comparison with the first six-year period. 



If my average for corn in the first six years would have been 52 bushels, 

 as it was in the second six years, I could have grown the 27,852 bushels 

 on 536 acres instead of 716 acres, or 180 acres less, and therefore 30 acres 

 less corn for each year. 



If the average for oats had been 51 bushels for the first six years 

 instead of 31 bushels it would have taken only 329 acres to have grown 

 the 16,760 bushels, or 202 acres less, and therefore 33 acres less oats for 

 each year. 



Taking 27 bushels of wheat, the average of the second six years, instead 

 of 21 bushels, the average of the first five years, the 5,207 bushels could 

 have been grown on 192 acres instead of 239 acres, or 47 acres less, making 

 an average of over 9 acres less for each of the five years. This gives a total 

 of 72 acres less grain for each year, or approximately one-fourth of the 320 

 acres, which could have been in clover. 



Why was the average so low in the first six years? This is easily 

 explained. My soil was very low in organic matter, therefore low in nitrogen 

 and available plant foods. During this time I could hardly get a stand of 

 clover. 



In 1916 a chemical analysis was made of the soil on an adjoining 

 farm, same type of soil and about the same system of farming in previous 

 years. The analysis showed 3,000 pounds of nitrogen and 800 pounds of 

 phosphorus in the plowed soil. No wonder my yields were so small. They 

 are still small, but that is mostly my fault, because I did what nearly every 

 farmer did during the high prices of grain, cut out clover and put all the 

 land into grain. 



ACTUAL CASH VALUE BECORD. 



In order to determine the actual cash value of the crop increase I 

 have kept a record of the crop yields of the threshing run and then 



