38 BULLETIN 614, U. 8. DEPARTMENT OF AGRICULTURE. 
The comparatively large cost reported for the mulch-crop orchards 
in the North Yakima district is due to the fact that a larger number 
of the ranches happened to be on a ditch where the cost of water 
maintenance is high. In the Zillah district the charge for water on 
the Sunnyside Canal is less than for most of the ditches in the North 
Yakima district. The difference here in the cost of maintenance 
between the mulch-crop and clean-cultural orchards is due to the 
fact that many orchardists practicing clean-cultural management 
from whom data were obtained are on the Konawak Canal and have 
a free water right. There is little difference between the number of 
irrigations made on mulch-crop and on clean-cultural orchards, 
although there seems to be a slight tendency (see Table XX XI) to 
make more irrigations on the mulch-crop orchards. More labor, 
however, is expended in looking after the irrigation on clean-cultural 
than on mulch-crop orchards. Table XXX brings out the fact that 
in both the North Yakima and Zillah districts more time is used in 
examining the ditches and regulating the water on the small than on 
the large orchards. 
Considering the records from both clean and nealeeierag orchards 
in the North Yakima district, there is an average of 4.52 irrigations, 
requiring 19.45 man-hours per acre, at a cost of $4.86; while in the 
Zillah district there is an average of 3.70 irrigations, requiring 15.30 
man-hours per acre, at a cost of $3.83. For the entire valley the 
records show an average of 4.14 irrigations, requiring 17.52 man- 
hours per acre, at a cost of $4.38. 
TaBLE XXXI.—Time chargeable for irrigation and pro rata water tax per acre for 120 
farms in Yakima Valley. 
North Yakima district. | Zillah district. 
| 
Managemert. Num- Num- 
ber of | Man- | Labor | Water| Total | berof | Man- | Labor | Water | Total 
irriga- | hours. | cost. tax. cost. | irriga- | hours. | cost. tax. cost. 
tions. tions. 
Clean cultural.....-- 4.50 | 20.30] $5.08 | $2.66 | $7.74 3.66 | 16.07 | $4.02] $0.81 $4. 83 
Mulch crop: 522-22 4.57 Weve 4.43 4.01 8.44 3.80 14. 28 3.57 .92 4.49 
Combinedi® --=24--- 4.52 | 19.45 4.86 3.10 7.96 3.70 | 15.30 3.83 86 4.69 
North Yakima and Zillah districts 
Management. 
A Man- Labor | Water | Total 
ti mas hours. cost. tax. cost. 
Gleankoul ital 2c a oe eee ee ee 4.14 18. 50 $4. 63 $1. 87 $6. 50 
IMITIGHRCTODES soe sion concn Rete ee eee ee ey eee at 4.13 15. 89 3.97 2. 36 6. 33 
CombpINeGhe..% shese hese te ke aoe ees 4.14 752 4.38 2.06 6. 44 
