The Potato Industry of Coeorado. 3 , 
deep ditches are not required; and in fact, where the land is steen 
neces^Try^alt^ou^^th 68 ''"^ 6 ' , Ndther is SUch dee P cultivation 
an parts of the Cl,I ‘ Ivatlon & ives the best results in 
i P • . a te* The length of time required to wet the soil 
th y ;K ,ngVaneS , Withthepercent °f s >°P e - That is the greater 
f o , tbe V ea ‘ er length of time the water must be run 
level ™hind°th7 h the , ^u LU!S Va ' Iey ’ Where the ,and is 
_ ough and the subsoil will permit, a system known as snh 
irrigation is practiced. For this purpose lateral dkches are run ai 
uniform intervals of from 30 to iko feet across thf/.m mi 
water from these ditches in a short time fills the subsoil from the 
“mo°t?„r“e“ r oll f rise > “ th ' »»■*« 
» s t n b ” • ?s 7 r *» t 
- S'rr a ^ - 
PlvATK VIII 
Drawing hy C. L. F. 
The Advantage of Sufficient .SV^E—Whe77here is fed 
r"f w “ ™ » »"««" * no, back np U,e 
r,?7 u 7 i m , e ’ We have the cond ition shown on the ritrht 
The lull space and the dirt about the tubers is not puddkd and se ' 
but is moistened like a wick from below as indicated at (a) Ideal 
Tr 7 r aI l crops including potatoes is about i per cent or To 
feet to the mile* On much steeper lands, great care is reouired to 
0^00^0 eaVy 7 ashmg ' However > with good subsoil, record crops 
to fte rSle “ ^ gr0W " Where the faI1 is a t least 200 feet 
runcTT 1 ^ and . s . N ° t so Good .—Where the fall is slight, very short 
tain 1,7 t? 1UCh ° r and f klU are re< l u i red ' or conditions will ob¬ 
tain like those shown to the left. With the water Wei ,t ?, 
be bnef lf th - e soaked Portion be confined to the line A 
" d lt IS Pretty a Pt to rise to b and b', and the hill surface is sure 
whi P M n d „ t0 th r e level x; whiIe with the water level at x' the 
dltgcj* h " 1 SUrfa “ and m “ h ° f «“ l*d » k 
_ ^_ curate Grading of Flat Lands is e ssential that the existing 
spot, but requfr e es d0 thVs 0 u\sti r mUon t o^ h 77™gatio°n U 77^ S d headS at ° De 
■rngaUon tor all fields, to the great benefit of every crop S ’ ™ W 
