52 



BULLETIN 316, U. S. DEPARTMENT OP AGRICULTURE. 



The returns from willows planted now may be more fairly estimated 

 on the basis of what the best plantations of the past have done rather 

 than the averages, because the average plantations represent a great 

 amount of poor practice that may now be avoided. The following 

 yields are for groves whose appearance and history show that they 

 have been treated in a rational manner: 



Table 21.— Yield of selected willow groves in Iowa. 



Plot No. 



Size of 

 plot. 



Age. 



Yield 

 per acre. 



Yield 

 per acre 

 per year. 



Location. 



1 



A cres. 

 0.25 

 .25 

 .25 

 .25 

 .25 

 .25 

 .25 

 .25 

 .25 

 .25 

 .25 

 .25 



Years. 

 11 

 16 

 16 

 18 

 18 

 21 

 21 

 22 

 24 

 25 

 25 

 31 



Cords. 

 47.3 

 76.8 

 62.4 

 109.8 

 81.0 

 109.2 

 73.5 

 116.6 

 132.0 

 105.0 

 95.0 

 102.0 



Cords. 

 4.3 

 4.8 

 3.9 

 6.1 

 4.5 

 5.2 

 3.5 

 5.3 

 5.5 

 4.2 

 3.8 

 3.3 





2 



Do. 



3 



Do. 



4 



Do. 



5 



Do. 



6 



Do. 



7 



Do. 



8i 



Do. 



9 



Do. 



10 





11 



Do. 



12 



Do. 









4.5 















1 Illinois Agricultural Experiment Station. 



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