8 Colorado Agricultural Experiment Station 
good crops without irrigation, will not form seed satisfactorily. Hence 
it is difficult to draw conclusions. But there is ample evidence to show. 
th fi h Z cV ’ W le ! l > and wher e moisture is supplied has something to do 
with the question as well as the amount of water. 
,n A' ate C 0 ' 2 ’ is r vie r °[ a dr >' s P ot in a fie >d of alfalfa planted 
in rows where irrigation has been withheld for two years to test seed 
fah 0 1e U f 0 d n ;t T if ,T HS ?A ep , Sand y l0am > sixteen'feet to the water 
able and the altalfa in this field grew rank with no apparent need of 
eXCept H1 S ° me d 7 s P° ts • Here «emed possible for one 
g find the proper amount of moisture required to form seed for some 
where between the dried up center of this spot and {heTankgrowTng 
portion of the field there should have been a point that had the pro'i'- 
per moisture to set seed. Such was not the case as there was practically 
Sifix m ,h ' s “ d *“• <« ”,„ pr S,"23 
) tes t ho,e Wlth a soil auger proved that the cause of the drv soots 
w as due to a gravel stratum eight feet below the surface which P C ut 
off capillary moisture. The rest of the field had twelve feet of mofet 
Plate No. 3 is a view of one of the nursery plats at Rnrtv 
Which has been held without irrigation for ove'r ? a year Th/£er 
yearffn ^forgrouid. ofL'SS* for over 
mg moisture owing to the capillary moisture in ft.* tU ^f’ d . lstant en< * s of the rows not ne< 
portion in every ofher row aPP ‘ ied '° th ' d 
