1 64 THE ESSENTIALS OF AGRICULTURE 



No. 8. In this test the ground was double disked July 15 and 

 then, August 15, plowed 7 inches deep. The cost of preparation 

 was $4.93, and the yield, 23.4 bushels, was worth $19.20 at 

 market price, leaving $14.30 to pay other expenses. 



No. 9. July 15 this plot was listed 5 inches deep, and the 

 ridges split August 15. The average yield for the three years was 

 22.9 bushels, worth $18.65. The cost of preparation was $3.92, 

 leaving a balance of $14.73. 



No. 10. In this test the land was listed 5 inches deep on 

 July 15 and was worked down level the following month to firm 

 the seed bed and prevent loss of moisture. The average yield 

 was 22.77 bushels, worth $18.58. The cost of preparation was 

 $4.05, leaving a balance of $14.53. 



No. n. Land plowed 7 inches deep (right depth) July 15 

 (right time) produced an average yield of 27.11 bushels per 

 acre, worth $22.22. The cost of preparation was $5.35, leaving 

 $16.87, tne largest balance of any in the test. 



202. Preparing land for wheat when grown in rotation with 

 other crops. It has been found that when wheat is grown in 

 rotation with other crops, the yield is not only better but is often 

 obtained at less expense. This is shown by an experiment 1 in 

 preparing ground for wheat that was used for oats in 1912 and 

 for corn in 1911. This ground was plowed 7 inches deep for 

 the corn crop and 6 inches deep for the oats. After the oats 

 were harvested, the ground was prepared for wheat in five dif- 

 ferent ways with the following results : Three plots were plowed 

 in July, 3 inches, 7 inches, and 1 2 inches deep, respectively. All 

 three of these plots produced practically the same yields 44.08 

 bushels for the 3-inch plowing, 44.66 bushels for the 7-inch 

 plowing, and 44 bushels for the 1 2-inch plowing. The cost of 

 preparing the ground, however, was quite different $4.35 for 

 the 3-inch plowing, $4.85 for the 7-inch plowing, and $8.10 for 

 the 12-inch plowing. This experiment shows that where wheat 

 is rotated with other crops and the ground is well prepared for 

 them, deep plowing is not so essential as when the wheat is 

 grown continuously upon the same land. 



1 Bulletin jfd, Kansas Agricultural Experiment Station. 



