46 CULTIVATION METHODS AND ROTATIONS FOR GREAT PLAINS. 



Rotation No. 1 — corn on fall plowing, wheat on disked corn stubble, 

 oats on fall plowing — is identical with No. 4 except that the sequence 

 of the wheat and oats has been changed. Rotation No. 5 — summer 

 tillage, wheat on summer-tilled land, oats on fall plowing — is identical 

 with No. 8, except that the sequence of the wheat and oats has been 

 changed. We have therefore two pairs of rotations, 1 and 4 and 5 and 

 8. In both rotations of the first pair (1 and 4) corn is raised. In one 

 of them (1) wheat is sown on the disked corn stubble. In the other 

 (4) the oats are sown on the disked corn stubble. In the second pair (5 

 and 8) the land is summer tilled instead of being planted to corn. In 

 one of these (5) wheat is sown on the summer-tilled land. In the 

 other (8) oats are sown on the summer- tilled land. 



A comparison of the average farm value per acre of these two pairs 

 of rotations will give the relative merits of disked corn stubble and 

 summer tillage as a preparation for both wheat and oats. 



In the column headed "No. 1 " is given the average farm value per 

 acre of the two grain crops, wheat and oats, for each test. These 

 values are calculated at 60 cents per bushel for wheat and 30 cents per 

 bushel for oats for rotation No. 1. In the column headed "No. 4'' 

 are given the same data for rotation No. 4. In the next column to 

 the right are given the average farm values per acre of the wheat and 

 oats in the two corn rotations (1 and 4). In the columns headed 

 "No. 5 " and "No. 8 " are given the same data for rotations Nos. 5 and 

 8, respectively. In the next column are given the average farm val- 

 ues per acre of the wheat and oats in the two summer-tilled rotations 

 (5 and 8). In the next two columns are given the differences in farm 

 value per acre between the average of the two pairs 1 and 4 and 5 and 

 8, which represent the gain in favor of summer tillage or disked corn 

 stubble, as the case may be, for each test. In these comparisons the 

 value of the corn crop is not included, the oat and wheat crops alone 

 being considered. It is found that in twelve tests the summer- tilled 

 rotations gave better average farm values per acre for the two grain 

 crops than did the corn rotations, while in seven tests the corn rota- 

 tions gave better average farm values for wheat and oats than the 

 summer-tilled rotations, the average farm value per acre in favor of 

 summer tillage being only $1.04 per acre and the greatest gain of 

 summer tillage over disked corn stubble being only $4.41 per acre. 



The cost of the summer tillage was fully equal to, if not more than, 

 the cost of raising the corps of corn. Therefore, the total value of 

 the crops of corn raised should be credited to the corn rotations. 

 Although the yields from the corn plats, as previously explained, were 

 much less satisfactory than those from the small grain plats, we have 

 given them in this instance. In four tests, Judith Basin, Mont., 

 Dickinson, N. Dak., 1908, and Edgeley, N. Dak., 1907 and 1908, the 

 corn did not mature on account of the variety used not being early 

 enough. In two other tests, Garden City, Kans., and Dalhart, Tex., 



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