PLANTS AND WATER 



45 



not often, than to give them a little water frequently. If 

 possible, land should be cultivated as soon after it is 

 irrigated as it is dry enough. After the ditches are dug 

 and the gates are made, the only expense of this kind of 

 irrigation is keeping the system in order. This is least 

 expensive if the ditches are straight, and the water flows 

 slowly. The very numerous rapidly falling streams 

 make this kind of irrigation feasible and cheap on 

 most of the good agricultural land in the Philippines. 



I-'IG. 34. Irrigation ditch and flume in Lcpanto-Bontoc 



