- 34 -


Average
Annual
Output
(rice $)


 Type A


 Si(-~Sas

 Sms
"----------- ----s


Pm


 Sas-
L s---
 Sms _

 Pm









 Sas

 L
 Sms


 Pm







 Sas

 L


 Sms




 Pm


 -. -----


.. -- -- ... ..... .. ... ....




 Time


 Time

 Type B


-A. A A A -A.A. AAA A.A-A 4-A********



- r- .-- -
" ------ --- ---. .




.: .T....... i m ...... ... ....


 Time
 Type C
 I ***** *AAA*' AAAAAAAA AAA A*-**


FIGURE 1


Sas

L
Sms


Pm






Sas

L


ims




Pm


i