Definition
Irrigated lowland - refers to farm area whose elevation is 600 meters above sea level.
Irrigated middle - refers to farm area whose elevation is between 600--900 meters above sea level.
Irrigated highland - refers to farm area whose elevation is above 900 meters above sea level. Farm areas even as high as 1500 meters above sea level can still be utilized for farming as long as there are irrigation facilities.
Rainfed lowland - type of palay farm where dikes were built but it also depends on rainfall to hold water.
Rainfed Upland - ground elevation above the lowlands along rivers or between hills that depends on rainfall.