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 K!&#&&$v3tt.?riy* 



The granular mulch rained upon and 

 left standing for a number of days. 

 Observe that the ground is cracking, and 

 that moisture is escaping through these 

 cracks. The crust can be easily broken 



Dust mulch rained upon and left stand- 

 ing in the hot sun. Note that the crust 

 has cracked, and that the moisture is 

 escaping very rapidly. It is impossible 

 to work up this seed bed properly 



Stubble left standing after harvesting. 

 Note that the ground is full of cracks, 

 and that it is very hard 



Stubble disked immediately behind 

 the binder. Note that there are no 

 cracks in the ground, the stubble is cut 

 up, and a mulch is left on the surface 

 to prevent moisture from escaping 



26 



