Environmental Engineering Reference
In-Depth Information
T > 0
Weed effect?
F
w
= 1
N
Weed effect at full growth (F
wmax
)
Stage of weed at the start (F
wi
)
T > 0
Maintenance?
Y
N
T > 0
Maintenance
type?
T > 0
Weed grown
up fully?
Ideal
Y
F
w
= F
wmax
N
F
w
= F
wi
Periodic
F
w
= F
wi
+ (F
wmax
- F
wi
)
*
T/GT
Before
maintenance
F
w
= F
wi
+ (F
wb
- F
wi
)
*
T/PMT
Weed stage before maintenance (F
wb
)
Weed stage after maintenance (F
wa
)
After
maintenance
F
w
= F
wa
+ (F
wb
- F
wa
)
*
T/PMT
Legend:
PMT = Maintenance interval
F
w
= weed factor
T = time under consideration
TIP = total irrigation period
Figure F.3. Weed height calculation method (Paudel, 2010).
