CONSERVATION OF ORGANIC MATTER. 



61 



SIX- YEAR ROTATION (NO. 2) 



Field A, 26§ Acres. 



1910. Corn. 



1911. Wheat, winter or spring. 



1912. Seeded to brome-grass. 



1913. Brome-grass meadow. 



1914. Brome-grass meadow. 



1915. Oats, barley, emmer, or wheat. 



Field B, 26f Acres. 



1910. Wheat, winter or spring. 



1911. Seeded to brome-grass. 



1912. Brome-grass meadow. 



1913. Brome-grass meadow. 



1914. Oats, barley, emmer, or wheat. 



1915. Corn. 



Field C, 26f Acres. 



1910. Seeded to brome-grass. 



1911. Brome-grass meadow. 



1912. Brome-grass meadow. 



1913. Oats, barley, emmer, or wheat. 



1914. Corn. 



1915. Wheat, winter or spring. 



Field D, 26f Acres. 



1910. Brome-grass meadow. 



1911. Brome-grass meadow. 



1912. Oats, barley, emmer, or wheat. 



1913. Corn. 



1914. Wheat, winter or spring. 



1915. Seeded to brome-grass. 



Field E, 26| Acres. 



1910. Brome-grass meadow. 



1911. Oats, barley, emmer, or wheat. 



1912. Corn. 



1913. Wheat, winter or spring. 



1914. Seeded to brome-grass. 



1915. Brome-grass meadow. 



Field F, 26| Acres. 



1910. Oats, barley, emmer, or wheat. 



1911. Corn. 



1912. Wheat, winter or spring. 



1913. Seeded to brome-grass. 



1914. Brome-grass meadow. 



1915. Brome-grass meadow. 



In some of the drier parts of the Great Plains area it will probably 

 be found impracticable to attempt to raise *brome-grass with a nurse 

 crop. In such localities rotation No. 1, as previously described, 

 should be modified by making it a 6-year instead of a 5-year rota- 

 tion. With the 6-year rotation the farm would be divided into six 

 fields of 26§ acres each, and we would, therefore, have 26f acres of 

 corn, 53J acres of brome-grass, 53| acres of small grain, and 26f 

 acres sown to brome-grass, but not yielding a crop. All the crops 

 in the rotation would follow each other in the order already specified, 

 except that there would be one year between the wheat crop and 

 the first year of brome-grass meadow, during which the seeding of 

 brome-grass would be done. 



When this modification of the rotation is adopted, the following 

 method will be found satisfactory for preparing the land for seeding 

 to brome-grass. The land should be plowed as soon after the crop 

 of wheat has been removed as is practicable. The treatment of the 

 soil after plowing should be such as will carry it through the winter 

 in the best physical condition. As soon as the frost is out of the 

 surface the following spring it should be harrowed, and this harrow- 

 ing should continue until the ground becomes thoroughly warm and 

 that time of the season has been reached when there is most likeli- 

 hood of rains. In the Dakotas this time is usually the first week in 



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