Ilocos Sur
| Municipality | Soil Series | Area (Ha) |
|---|
| Alilem | Bauang | 2,361.15 |
| Mountain soil (undiffe | 10,856.47 | |
| Banayoyo | Bantog | 555.32 |
| Bauang | 1,767.76 | |
| Bantay | Bantay | 1,588.00 |
| Bantog | 462.40 | |
| San Manuel | 1,708.93 | |
| Mountain soil (undiffe | 3,252.58 | |
| River wash | 94.37 | |
| Burgos | Bantog | 192.75 |
| Bauang | 4,689.02 | |
| Mountain soil (undiffe | 77.89 | |
| Cabugao | Bantay | 3,816.70 |
| Bantog | 2,572.70 | |
| San Manuel | 135.31 | |
| Beach Sand | 128.37 | |
| Mountain soil (undiffe | 162.47 | |
| Candon City | Bantog | 2,598.87 |
| Bauang | 3,624.35 | |
| San Manuel | 1,574.43 | |
| Beach Sand | 142.30 | |
| Caoayan | San Manuel | 545.17 |
| Beach Sand | 116.94 | |
| River wash | 1,177.03 | |
| Cervantes | Cervantes | 15,732.79 |
| Umingan | 458.21 | |
| Mountain soil (undiffe | 6,815.56 | |
| Galimuyod | Bantog | 664.85 |
| Bauang | 2,000.94 | |
| Mountain soil (undiffe | 615.51 | |
| Gregorio Del Pilar | Bauang | 1.41 |
| Mountain soil (undiffe | 6,396.96 | |
| Lidlidda | Bantog | 23.65 |
| Bauang | 3,346.69 | |
| Mountain soil (undiffe | 577.27 | |
| Magsingal | Bantay | 1,652.15 |
| Bantog | 186.40 | |
| San Manuel | 3,773.08 | |
| Beach Sand | 424.65 | |
| Mountain soil (undiffe | 2,079.02 | |
| Nagbukel | Bantog | 353.26 |
| Bauang | 3,292.63 | |
| Narvacan | Bantog | 5,015.99 |
| Bauang | 3,627.22 | |
| Mountain soil (undiffe | 1,027.32 | |
| Quirino | Cervantes | 9,933.34 |
| Mountain soil (undiffe | 10,634.67 | |
| Salcedo | Bantog | 78.93 |
| Bauang | 4,459.27 | |
| San Manuel | 93.55 | |
| Mountain soil (undiffe | 2,291.69 | |
| San Emilio | Bauang | 459.71 |
| Cervantes | 3,299.16 | |
| Mountain soil (undiffe | 8,925.11 | |
| San Esteban | Bantog | 605.55 |
| Bauang | 1,100.03 | |
| San Ildefonso | Bantay | 256.33 |
| San Manuel | 1,064.63 | |
| San Juan | Bantay | 2,334.82 |
| Bantog | 213.31 | |
| San Manuel | 2,403.22 | |
| Mountain soil (undiffe | 377.46 | |
| San Vicente | San Manuel | 1,216.68 |
| Beach Sand | 2.84 | |
| Santa | Bauang | 116.29 |
| San Manuel | 1,094.79 | |
| Umingan | 839.85 | |
| Mountain soil (undiffe | 2,895.64 | |
| River wash | 547.35 | |
| Santa Catalina | San Manuel | 883.15 |
| Beach Sand | 56.35 | |
| Santa Cruz | Bantog | 1,477.04 |
| Bauang | 7,224.90 | |
| San Manuel | 1,882.44 | |
| Mountain soil (undiffe | 3.27 | |
| Santa Lucia | Bantog | 2,317.91 |
| Bauang | 1,362.38 | |
| San Manuel | 683.97 | |
| Santa Maria | Bantog | 2,608.41 |
| Bauang | 2,414.19 | |
| San Manuel | 322.37 | |
| Santiago | Bantog | 1,683.90 |
| Bauang | 4,555.72 | |
| San Manuel | 252.69 | |
| Beach Sand | 75.46 | |
| Santo Domingo | Bantay | 1,223.67 |
| San Manuel | 3,254.47 | |
| Beach Sand | 46.72 | |
| Mountain soil (undiffe | 511.13 | |
| Sigay | Bauang | 503.16 |
| Mountain soil (undiffe | 9,341.74 | |
| Sinait | Bantay | 5,894.14 |
| Bantog | 742.10 | |
| San Manuel | 553.75 | |
| Mountain soil (undiffe | 161.59 | |
| Sugpon | Bauang | 88.60 |
| Mountain soil (undiffe | 17,939.49 | |
| Suyo | Bantog | 77.31 |
| Bauang | 6,648.63 | |
| Mountain soil (undiffe | 8,126.21 | |
| Tagudin | Bantog | 1,959.11 |
| Bauang | 2,724.91 | |
| San Manuel | 140.05 | |
| Sinapangan | 152.27 | |
| Beach Sand | 173.56 | |
| River wash | 229.85 | |
| Vigan City | Bantog | 53.28 |
| San Manuel | 1,925.58 | |
| Umingan | 52.70 | |
| Beach Sand | 73.66 | |
| River wash | 286.36 |
Soil Series
Properties limiting crop production
Management Recommendation
| Bantay | Acidic; shallow soil limiting productivity of shallow-rooted crops; low K; moderate erosion | Adequate fertilization; OM addition | Liming; adequate fertilization; OM addition or green manuring; practice contour tillage and strip cropping | Marginally suited to root crops; adequate fertilization; OM addition or green manuring; practice contour tillage and strip cropping |
| Bantog | Poor drainage; high shrink and swell capacity upon wetting and drying producing wide cracks in the soil, hard when dry; seasonal flooding in lower areas; slow permeability; low K | Practice shallow cultivation when soil moisture is at optimum; suited for irrigated and rainfed lowland rice; maintain properly the paddy dikes; adequate irrigation during dry season | Construction of adequate drainage irrigation and flood control system due to seasonal flooding hazard in low areas; use of broadbeds, ridges or furrows and mulching; application of organic matter and farm manure | Establishment of adequate drainage and irrigation system; application of organic matter and farm manure |
| Bauang | Hilly topography causing severe erosion that causes loss of surface soil and exposing the subsoil or substratum; low fertility; excessive run-off; slightly acidic; presence of stratified shale and sandstone near surface that slows down percolation of wate | Suitable for rainfed lowland rice during dry season with adequate supplemental irrigation and contour terracing for higher elevated areas; fertilization | Application of farm manure and plowing under of legumes to supply organic matter; contour tillage and strip cropping; crop rotation | Application of farm manure and plowing under of legumes to supply organic matter; contour tillage and strip cropping to minimize erosion; crop rotation |
| Cervantes | Hilly to mountainous topography; soil erosion and runoff; low fertility | Not suitable for lowland rice; for upland rice production construct terrace with proper outlets or strip cropping; fertilizer application according to needs | Observe erosion control measures, careful management and intensive conservation practices: practice close-growing crops with a legume in rotation, contour tillage, strip cropping, cover cropping, grassed waterways and terracing with proper outlets; fertil | Observe erosion control measures, careful management and intensive conservation practices: practice close-growing crops with a legume in rotation, contour tillage, strip cropping, cover cropping, grassed waterways and terracing with proper outlets; fertilizer application according to needs; incorporation of compost and farm manure or green manuring |
| San Manuel | Excessively wet and annual flooding for short periods and excessive drought during dry season; low OM | Suited for paddy rice during wet season and with adequate irrigation during dry season; OM addition thru animal or green manuring | Construction of adequate drainage, irrigation and flood control systems for seasonal flood hazard and high seasonal water table; use broad beds and ridges; suited for diversified crops such as corn, and vegetables during dry season with supplemental irri | Establishment of adequate drainage and irrigation systems; regular addition of organic matter and animal manure to improve soil fertility |
| Sinapangan | Loose surface causing risk of erosion (formation of big gullies and loss of surface soil exposing the subsoil); drainage obstructed by the dense subsoil; low OM; poor drainage | Suited for paddy rice during wet season and with adequate irrigation during dry season; OM addition thru animal or green manuring to increase OM content and improve soil structure; construction of diversion ditches as passageway of water away from the fi | Construction of adequate drainage; Use of broad beds, ridges or furrows; mulching; fertilization; construction of diversion ditches | Construction of adequate drainage; Use of broad beds, ridges or furrows; mulching; fertilization; construction of diversion ditches |
| Umingan | River flooding; gravelly subsoil layer causes drought; low OM | OM addition thru animal or green manuring to increase OM content and improve soil structure; clearing of large gravels and rock | Construction of adequate irrigation and flood control system; application of fertilizer and organic matter; suited for diversified crops | Gravelly subsoil may cause lower yield of rootcrops |