23« 



THE CEREALS IN AMKRlCA 



Sixty-one tests of deep 

 cultivation at thirteen sta- 

 tions gave an average yield 



due to deep cultivation.^ 

 Most of the stations have 

 considered one to two 

 inches deep, shallow culti- 

 vation, and four or more 

 inches deep, deep cultiva- 

 tion. In some of the trials 

 where deep cultivation was 

 found the best, notably at 

 the Wisconsin Station, deep 

 cultivation was only three 

 inches deep, and in the 

 average of twenty-one trials 

 was only one per cent 



I Miss. BuL 33, p. 63. 



stations have made tests 

 of deep and shallow culti- 

 vation, as shown in table 

 on preceding page. 



r 



of sixty-five bushels, while 

 fifty-five tests of shallow 

 culture gave seventy-five 

 bushels per acre, a de- 

 crease of thirteen per cent 



Tools for the shallow cultivation of maize. A, one- 

 horse cultivator with three broad shovels in rear, 

 the width and depth being adjustable, requiring 

 the passage twice to cultivate a single row; B, 

 two-horse walking cultivator, with broad knives 

 for connplete surface tillage, cultivating a single 

 row at each passage ; C, two-horse riding culti- 

 v.'tor, shallow cultivation being secured by four, 

 sonnetimes five, small shovels on each side, the 

 depth being adjusted by means of levers shown 

 above frame ; cultivates a single row ; D, three- 

 horse riding cu'ti"ator for cultivating two rows 

 at one passage. 



