360 



STATE BOARD OF AGRICULTURE. 



plots showed an increase of 4,450 pounds of green matter, tlie quantity 

 of sweet clover produced on the untreated plots being negligible. 



On the above soil further work was carried on using different fineness 

 of division of limestone and other forms of lime. A standard application 

 of 4,000 pounds of the carbonate forms, limestone and marl, and an 

 equivalent amount of lime in the hydrated form were used. A rotation 

 of soy beans for seed, rye, wheat and sweet clover for green manure has 

 been followed. Owing to a late spring application of lime and late 

 seeding of soy beans the first year, the crop was very poor and the re- 

 sults are not given. In table 10 are presented the results for the rye and 

 wheat crops. 



FiGUBE 9. — This soil responds to complete fertilizers. No. 1, no treatment;! No. 2, lime; No. 3, 

 lime, phosphoric acid and potash. Sweet clover, Cass County Farm. 



Table 10 — Cass County lime experiments. 



Hydrated lime (N 100-P 200) 



Marl (N 100-P 200) 



80-mesh (N 100-P 200) 



40-60-mesh (N 100-P 200) . . . , 

 10-20-mesh (N 100-P 200) . . . , 



Check (N 100-P 200) 



No treatment 



Rye, 1918. 



Grain — 

 bushels. 



21.60 

 18.40 

 21.28 

 18.36 

 14,40 

 12.42 

 12.82 



Wheat, 1920. 



Grain — 

 bushels. 



16.0 

 19.2 

 16.0 

 15.53 



11, 



0, 



73 

 6 



3.46 



Straw- 

 lbs. 



2,112 

 1,632 

 1,568 

 1,568 

 1,152 

 1,120 

 384 



The sweet clover although grown for green manure in the season of 

 1921 showed little differences in growth where the soil was treated with 

 marl, hydrated lime and 80-mesh limestone. Tlie growth of sweet clover 

 in 1920 was less as the coarseness of the limestone increased. 



