290 GRASSES AND HOW TO GROW THEM. 



fully. But it is questionable if, as a rule, such re 

 newal would be profitable, as after a time, the fertility 

 of the soil would be much depleted unless heavily fer- 

 tilized, and its mechanical condition would become such 

 as to prove less favorable to abundant production than 

 if the seed were sown on newly ploughed ground and in 

 proper rotation. Sowing afresh, therefore, on properly 

 prepared land is preferable to renewing. 



