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Are there really more than 3 million hectares of irrigated rice fields in the Philippines?

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Fig. 01, showing lands used for rice cultivation, looks impressive. The rice yield cultivated in irrigated lands vs. rain-fed or upland fields may range from 4-6 tons - (ha-season)-1 vs. 1.5-2.5 tons - (ha-season)-1, respectively. Further, irrigated ricefields are used about 2-3 times each year, more than doubling the total rice production per year. In contrast, rainfed and upland farms used for  rice cultivation is used only once each year, when there is enough rain to flood the land throughout the duration of rice cultivation.

Fig. 01 seems to indicate as if all the irrigable lands of 3.02Mha (see Fig. 02 for irrigable lands) have been irrigated and more (3.25Mha of irrigated lands were used for rice production, based on the latest 2014 data), and every irrigated land (1.68 Mha irrigated lands as reported by NIA) were used for rice production.

It is quite apparent that there is an unexplained discrepancy between the total irrigated lands used for rice production because a number of sources indicated just about over 50% of ricelands are irrigated, so far.

If the 50% irrigation is correct, does this mean another 2-3Mha of ricefields that can be irrigated? Some of these lands may come from the rainfed lowland used for rice cultivation during the rainy season but this cannot include the upland areas used for rice cultivation during the rainy season also, because the upland areas cannot be irrigated using conventional irrigation systems?


PhilRice Graph (FAO)
Fig. 01. PhilRice Graph of lands used for rice cultivation.  The total irrigated lands used for rice production almost doubled while the total of unirrigated rice decreased from 1970-2010.



Total of 1.68 million hectares (Mha) of Irrigated Lands in the Philippines

The National Irrigation Admistration (NIA) estimated about  1.68Mha of total irrigated lands -- out of the total 3.02Mha irrigable lands from the 9.67Mha total of agricultural lands in the Philippines (Fig. 02).  


Irrigated, Irrigable, Arable, and Total Agricultural Lands
Fig. 02. Total Irrigated Farmfands from the National Irrigation Agency (NIA).  Irrigated (LTI-NIS - filled light blue diamonds), Irrigable (LTIR-NIS - filled light green square), Arable (LAR - filled red inverted pyramid), and Total Agricultural Lands (TAL- filled light violet circle). The NIA defines "irrigable lands (LTIR-NIS)" as agricultural lands with slopes no greater than three degrees (3o) to be feasible for conventional irrigation systems. Arable lands (LAR) are a fraction of the total agricultural lands that are used for cultivation of temporary crops, i.e., crops that require less than a year from planting to harvest (e.g., rice, corn, most vegetables, melon, etc.);  sugar cane, pineapple, banana are in between; and, coconut, fruits trees are included in permanent crops.  
The total agricultural lands  (including irrigated, irrigable and arable lands) fluctuate.  The Department of Environment and Natural Resources (DENR) may release classified forest lands, as alienable and disposable lands to become eligible for tenancy and subsequent private ownership. The intent is to encourage agroforestry and food production.  Unfortunately, once any land is private and held for a number of years by the tenant, the land may be sold for any purpose. Because there is no restriction, more than 300,000 hectares of agricultural lands have been lost to urbanization between 1991 to 2002.
There is yet no readily available online data to ascertain how many hectares of land has been lost to urbanization since 2002 to 2014.


Total Farmlands Used for Rice and Corn Cultivation
Fig. 03. Total Farmlands Used for Rice and Corn Cultivation. Legends. TLP - Total land used for rice production (open dark blue diamond); TLP - Total land used for conn production (rust yellow filled triangle) and TLPC -- combined total of lands used for rice and corn cultivation (open light violet circles). The total agricultural lands (TAL, filled violet circle), total arable lands (LAR, filled red inverted triangle), total irrigable land (LTIR-NIS, filled light green square) and irrigated lands (TI-NIS, filled light blue diamonds) 

The total farmlands available for rice cultivation cannot exceed 4.9Mha (review total land for rice production in Fig. 01, and ricefields cultivated for rice production based on 2014 data, to be presented in Fig. 03).  The total arable lands (Figs. 02 and 03) used for cultivation of temporary crops (i.e., rice, corn, vegetables and others that takes less than a year from planting to harvest) is estimated at about 4.9Mha.

However, from Bureau of Agriculture Statistics (BASTAT) data, the combined total for lands used for rice and corn cultivation was  7.35Mha, well over the 4.9Mha total for arable lands (LAR, see Fig. 02 and 03).




If the NIA data is correct, the total irrigated lands used for rice production would even be lower than 1.7Mha (Fig. 02), since irrigation water is used also for high value crops and vegetables, animal husbandry and aquaculture.  And, if it is correct that the irrigated area used for rice production is just about half (or even less) of what is indicated in Fig. 01, it is  an ever better news:

First, the rice yield per season is even higher (and closer to yield potential of the rice varieties used today).

Second, if only 1.7Mha so far has been irrigated, then there are 1.4Mha of the total 3.1Mha irrigable land that can be irrigated.  This will provide the potential for greater land productivity as more lands become irrigated in the future.