Estimated irrigation use for a 120-day growing period from

tensiometer scheduled irrigation in Exp-3 is 13.8 inches.

Calculations are based on irrigation with 0.06 inches/day for the

first 37 days of growth and 0.14 inches/day for the last 83 days.

The close agreement between Exp-1 and Exp-3 on estimated seasonal

irrigation use confirms that a 120-day tomato crop can be produced

with about 15 inches of drip irrigation in a dry year. The amount

used will vary with length of growing season.


 10 Accumulative Irrigation Use (Inches)
 Irrigation Schedule
 S Tensiomertr
 E o.0o-0.00 Inohal/day
 E 0.06-0.12 Inches/day



 4-


 2-


 o
 Ap-4 Ap-17 My-1 My-11 My-22 Jn-5 Jn-19 Jn-29
 Date (Month-Day)

Figure 4. Accumulative irrigation use by treatments in exp. #3.



 The relationship between amount of irrigation and total

marketable yield was linear for tomatoes irrigated daily in Exp-2

(Fig. 5). However, regression analysis showed no significant

response of total marketable tomato yield to irrigation applied on

Monday, Wednesday, and Friday of each week. The equation, Y = 16.1

+ 0.125W (r = 0.597, P < 0.01), describes predicted total yield

response to daily irrigation, where Y = tons/acre and W = % of