47 



Growth of valley or watered silver maple. 



BLACK WALNUT. 



Black walnut has been extensively tried, but has succeeded only in 

 favored localities, and can not be recommended for general planting. 

 The rate of growth is very good, and excellent results are sometimes 

 obtained in the valleys. It is a desirable tree, and should be raised 

 wherever possible. It is easily grown by planting the nuts where- the 

 trees are wanted. Owing to the long taproot, transplanting is some- 

 what difficult. While in a number of cases a more rapid rate of 

 growth was found on the uplands than in the valleys, they should be 

 regarded as anomalous, and not a true index of the habits of the 

 species. After a few years of rapid progress the upland tree is likely 

 to die. For instance, a row of black walnut at Smith Center at 16 

 years of age averaged 5.9 inches in diameter, thus giving an inch of 

 increase for every 2.7 years an excellent rate of growth; but when 

 measured these trees had reached their limit, in spite of good care, 

 and were either dead or dying. Contrasted with this is a row of 

 black walnut along the road 5 miles south of Great Bend, where the 

 soil is sandy and water not over 25 feet below the surface. At 20 

 years of age these trees were 25 feet high, ran from 6 to 12 inches 

 in diameter, with an average of 9 inches, and were in excellent con- 

 dition, while seedlings were appearing in numbers beneath them. 



Growth of valley or watered black walnut. 



[Cir. 161.] 



