Planting period:
Growing period:
Crop factors: Kc
Day 0-60
Mid season
Last 30 days
|
SAT: |
mm Early |
Late |
|
PERC: |
mm/day = mm/month | |
|
WL |
mm Early |
Late |
|
Month |
Jan |
Feb |
Mar |
Apr |
May |
June |
July |
Aug |
Sept |
Oct |
Nov |
Dec |
|
area |
|
|
|
|
|
|
|
|
|
|
|
|
|
cropping pattern |
|
|
|
|
|
|
|
|
|
|
|
|
|
ha |
|
|
|
|
|
|
|
|
|
|
|
|
|
ET0 (mm/day) |
|
|
|
|
|
|
|
|
|
|
|
|
|
Pe (mm/mon) |
|
|
|
|
|
|
|
|
|
|
|
|
|
Growth stages |
|
|
|
|
|
|
|
|
|
|
|
|
|
Kc per gr. st. |
|
|
|
|
|
|
|
|
|
|
|
|
|
Kc per month1 |
|
|
|
|
|
|
|
|
|
|
|
|
|
ETcr mm/mon2 |
|
|
|
|
|
|
|
|
|
|
|
|
|
SAT mm/mon |
|
|
|
|
|
|
|
|
|
|
|
|
|
PERC mm/mon |
|
|
|
|
|
|
|
|
|
|
|
|
|
WL mm/mon |
|
|
|
|
|
|
|
|
|
|
|
|
|
INe mm/mon3 |
|
|
|
|
|
|
|
|
|
|
|
|
|
Growth stages |
|
|
|
|
|
|
|
|
|
|
|
|
|
Kc per gr. st. |
|
|
|
|
|
|
|
|
|
|
|
|
|
Kc per month1 |
|
|
|
|
|
|
|
|
|
|
|
|
|
ETcr mm/mon2 |
|
|
|
|
|
|
|
|
|
|
|
|
|
SAT mm/mon |
|
|
|
|
|
|
|
|
|
|
|
|
|
PERC mm/mon |
|
|
|
|
|
|
|
|
|
|
|
|
|
WL mm/mon |
|
|
|
|
|
|
|
|
|
|
|
|
|
IN1 mm/mon3 |
|
|
|
|
|
|
|
|
|
|
|
|
|
INav mm/mon |
|
|
|
|
|
|
|
|
|
|
|
|
|
SINnet l/s4 |
|
|
|
|
|
|
|
|
|
|
|
|
1
average of Kc per month
2 ETcr (mm/mon) = ET0 (mm/day) x crop growing days per month x Kc (per month)
3 INe (mm/mon) = ETcr (mm/mon) - Pe (mm/mon)
4 SINnet = (INav x Area) / 260
Note: When cultivation does not start on the first of a month or when cultivation periods do not coincide with full months, the water requirement should be divided over the two months according to the number of days that fall in each month.
