KATE OF HUMU'ICATIONS OF GREEN MANURE. 



399 



Box 7, green sweet clover 2,050 f>;rams, layer, plus 100 grains CaCO., and soil. 



Box 8, green sweet clover 2,6^)0 grams, layer, not limed, soil. 



Box 9, green sweet clover 2,6.50 grams, chopped and mixed with soil. 



Box 10, green oats straw 2,368 grams, layer, plus 100 grams CaCO.-, and soil. 



Box 11, green oats straw 2,368 grams, laj^er, not limed, and soil. 



Box 12, green oats straw 2,368 grams, chopped and mixed with soil. 



Box 13, cowpeas 4.50 grams stalk dried, layer and soil. 



Box 14, alfalfa 450 grams, stalks dried, layer and soil. 



Box 15, sweet clover 450 grams, stalks dried, layer and soil. 



Box 16, oat straw 4.50 grams, stalks dried, layer and soil. 



Box 17, soil only. 



All the boxes contained the same weight of soil and green or dry manures 

 (reduced to dry bases 450 grams). They were buried Oct. 5 in a trench out 

 doors so that the tops of the boxes came just a little above the level of the 

 ground and six inches apart. It was thought the moisture conditions could be 

 kept more constant in this way. 



Farm Management of Green Manure 

 In applying the green manures by the different methods, it was aimed to 

 imitate the following farm practices: 



1. Turning under a heavy roll of green material. 



2. Discing the gi'een mass before plowing. 



3. Allowing the material to dry before plowing it under. 



4. Applying 5 tons of ground limestone per acre. 



Humus Determinations 

 The percentage of humus was determined, by the Smith method, w lien the 

 green materials were mixed and at varying intervals, A\ith the following re- 

 sults : 



