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RDE Abstract of Completed Research

Water Management
Irrigation water quality in some Luzon mill districts (1998)
Noel Pecho
Eighty -three water samples were collected from Tarlac (27), Pampanga (26) and Batangas (30).
Majority of the water samples from Tarlac have no salinity problems except those in Paniqui and some parts of San Miguel where water samples were taken from shallow wells and NIA canals. Most of the sampled areas had slight alkalinity problem except for waters from Pura and Gerona. Majority of the water samples from Tarlac were slightly to mildly alkaline except for the lower Tarlac municipalities of Capas and Concepcion which exhibited mildly acidic water.
Majority of the water samples from Pampanga showed no salinity and alkalinity problems. Water samples from open and underground sources were slightly to very slightly acidic.
Water samples from Batangas are still being analyzed at BSWM service laboratory.
Irrigation water requirements for each major soil texture in Luzon mill districts (1998)
Noel Pecho
Sixty-three soil samples were collected from Tarlac (16) Pampanga (17) and Batangas (30). From each soil textural group 3 to 5 samples based on BSWM provincial soil maps (Circa 1950s) were taken per province.
Samples from each soil texture group did not always conform to the BSWM soil map for all provinces. There is a need to update or make soil maps in the light of new surveying and mapping technologies like Geographic Information System (GIS), Global Positioning System (GPS), Remote Sensing (RS) and laser surveying.
Soil moisture parameters like field capacity (FC), permanent wilting point (PWP) and total available moisture (TAM) did not always conform to the range of values available in foreign literatures. It is recommended that proper soil sampling for soil physical analysis be undertaken prior to the design of irrigation and drainage works.
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