99. SOIL IN POOR TEXTURE 

 It needs more humus to make it mellow 



100. ON LEFT, A CLOD OF CLAY SOIL; QN RIGHT, DECAYING 

 STEMS AND LEAVES, WHICH BECOME HUMUS 



Mix the humus with the clay and note improvement. The same thing can be done 

 in the field, on a larger scale, by plowing under a green manure 



