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Soil fertility analysis for rice production in the lowland areas of Diplahan, Zamboanga Sibugay, Mindanao, Philippines

Research Paper | August 10, 2022

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Eduardo D. Magdayo Jr., Jaime Q. Guihawan, Hernando P. Bacosa, Lilybeth Olowa

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Int. J. Agron. Agri. Res.21( 2), 8-19, August 2022


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The most important practice that contributes to rice production is nutrient management. However, if the nutrient plant required is insufficient, low production is unavoidable. Thus, this study was carried out to determine the soil fertility status of lowland areas in the municipality of Diplahan. Soil samples from each sampling site were collected in rice farms using a composite random soil sampling moving in a zigzag pattern. A depth of 0- 15cm soil samples were collected from 15 – 30 different places in 1-5 hectares. An air-drying procedure was done before it was carried to the laboratory for final testing. Soil samples were analyzed for pH, organic carbon, organic matter, nitrogen, phosphorous, and potassium following the BSWM (Bureau of Soils and Water Management) procedures. Furthermore, a soil fertility map was outlined through ArcGIS software by plotting local coordinates in Google Map. Results showed that the areas in 10 selected barangays in the municipality have moderate soil acidity, with a pH level that falls below the desirable range of 5.5 – 7.0 but no lower than 4.5. According to the results of the soil organic carbon analysis, all barangays have insufficient SOC. Only four barangays have the optimal soil organic matter content for lowland rice production. The study also revealed that only two (2) barangays receive an adequate amount of nitrogen, while the rest are considered deficient. Phosphorous-rich soils were found in two (2) barangays; the five (5) barangays have a medium content; and the remaining three (3) barangays have a low content. Lastly, no barangay in the municipality obtains an adequate amount of exchangeable potassium ranging from 82-246 ppm. Problem of insufficient nutrient requirements for rice crop production is widespread in the municipality.


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Soil fertility analysis for rice production in the lowland areas of Diplahan, Zamboanga Sibugay, Mindanao, Philippines

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