SOIL. 



93 



pie taken from the unplowed land showed 10.58 per cent. 

 This soil when dried weighed 80 pounds to the cubic foot. 

 How many more tons of water per acre are there in the 

 plowed land than in the unplowed land ? 



Saving moisture by cultivation. The observed dif- 

 ference in the moisture content of a field of corn for one 

 season was as follows : 



CULTIVATION CONTROLS WATER CONTENT. 



PLOWING LEVEES FOR RICE. 



