HOW TO PREPARE AND FERTILIZE LAND 19 



as farm manures are not early available. 

 For medium and late maturing crops 

 farm manures are much the best. The 

 whole problem of manuring is a local one, 

 and is best determined by experiment. 



Water is necessary for the assimilation 

 of food. If the plants have plenty of 

 food and no water, it is of no value to 

 them. Tillage aids in keeping the water 

 supply constant by preventing the evapo- 

 ration of moisture by the sun when the 

 weather is dry and by allowing the top- 

 soil to dry out and get air when wet. 



Plants to succeed must have food and 

 care; the most important is care, and 

 care is largely tillage. 



