16 BULLETIN 162, U. S. DEPARTMENT OF AGRICULTURE. 
numerous individual trees bearing nuts of sufficient merit and in 
sufficient quantity to justify their being propagated as new varieties 
of special promise for this section. 
Twelve standard varieties are growing at this station. The original 
experiment embodied 19 varieties planted in 1909. These are being 
tested with much care under good dry-farming conditions. Such 
results as are indicated here, together with wide and varied obser- 
vations of the nat- 
ural home of bear- 
ing trees and the 
behavior of compar- 
able plantings in 
other situations, all 
indicate that care 
should be exercised 
in selecting  loca- 
tions for pecan 
plantings. Success- 
ful tree growth and 
fruiting should not 
be expected when 
the pecan is planted 
in a soil where un- 
derground water is 
not within reach of 
theroots. Thesur- 
face application of 
water on most of the 
higher land of this 
section does not ap- 
pear to fulfill the 
needs of the pecan. 
As the tree ap- 
Fic. 5.—A treeof Diospyros kaki, or Japanese persimmon, which is nearly proaches b earl ng 
dead from chlorosis. This tree has been in its present location for eight : 
seasons. The only persimmons that have been found thatareresistant AC, the roots must 
to chlorosis and root-rot are the native Diospyros terana and D. lotus. penetrate d ee p ly 
Compare with figure 6. (Photographed September 16, 1913.) ; : é : 
into soil which is 
drawing water from the underground water table; then the pecan 
succeeds and grows to be the most stately tree of Texas. The conten- 
tion advanced by some enthusiasts that since the pecan is native it 
can be grown under a great variety of conditions is erroneous. It 
should be borne in mind that the pecan in this part of Texas is dis- 
tinctly a river-bottom tree and that the mere application of light sur- 
face irrigations sufficient for many other trees will not satisfy its needs. 
