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escape of moisture direct from the soil, compelling it to evaporate 

 through the leaves of the plant. It also destroys weed growth 

 weeds mean extra evaporation. The farmer need not be afraid of 



doing any serious damage to the crop. It is very difficult to kill a 

 wheat plant once it is firmly established. I have harrowed wheat 

 when it was two feet high without hurting it but, on the contrary, 



