Ilocos Norte
| Municipality | Soil Series | Area (Ha) |
|---|
| Adams | Luisiana | 3,173.11 |
| Umingan | 92.33 | |
| Mountain soil (undiffe | 8,298.90 | |
| Bacarra | Bantay | 1,236.43 |
| San Fernando | 294.39 | |
| San Manuel | 2,802.89 | |
| River wash | 448.13 | |
| Badoc | Bantay | 3,487.75 |
| Bantog | 659.01 | |
| Faraon | 43.26 | |
| San Fernando | 68.87 | |
| San Manuel | 2,550.85 | |
| Mountain soil (undiffe | 39.75 | |
| River wash | 880.22 | |
| Bangui | Bolinao | 11.78 |
| Cervantes | 3,636.54 | |
| San Fernando | 1,259.62 | |
| San Manuel | 106.87 | |
| Tadao | 1,740.13 | |
| Umingan | 840.53 | |
| Mountain soil (undiffe | 6,171.45 | |
| Dune land (Sand Dune) | 517.27 | |
| Banna | Bantay | 276.54 |
| Bantog | 319.79 | |
| Cervantes | 3,359.89 | |
| Faraon | 1,036.68 | |
| Maligaya | 1,970.17 | |
| Umingan | 1,740.62 | |
| River wash | 258.21 | |
| Batac City | Bantay | 7,027.75 |
| Bantog | 2,020.60 | |
| Cervantes | 18.72 | |
| Faraon | 866.31 | |
| San Fernando | 1,084.02 | |
| San Manuel | 2,444.71 | |
| Burgos | Bolinao | 8,295.88 |
| Cervantes | 207.96 | |
| San Fernando | 100.67 | |
| Tadao | 1,696.20 | |
| Rock Land | 6,072.49 | |
| Dune land (Sand Dune) | 713.93 | |
| Carasi | Cervantes | 5,952.43 |
| Mountain soil (undiffe | 12,518.55 | |
| River wash | 552.68 | |
| Currimao | Bantay | 1,311.49 |
| Bantog | 296.90 | |
| Bolinao | 306.97 | |
| San Fernando | 372.20 | |
| San Manuel | 618.95 | |
| Dune land (Sand Dune) | 592.93 | |
| Dingras | Bantay | 224.89 |
| Bantog | 637.55 | |
| Cervantes | 1,063.93 | |
| San Fernando | 120.74 | |
| San Manuel | 2,284.04 | |
| Umingan | 2,269.25 | |
| Mountain soil (undiffe | 899.55 | |
| River wash | 1,565.18 | |
| Dumalneg | Luisiana | 271.47 |
| Umingan | 83.63 | |
| Mountain soil (undiffe | 7,939.37 | |
| Laoag City | Bantay | 1,681.87 |
| Bantog | 57.91 | |
| San Fernando | 2,596.42 | |
| San Manuel | 6,545.36 | |
| River wash | 172.23 | |
| Dune land (Sand Dune) | 713.30 | |
| Marcos | Bantay | 913.18 |
| Bantog | 546.38 | |
| Cervantes | 1,989.25 | |
| San Fernando | 488.63 | |
| San Manuel | 2.27 | |
| Umingan | 1,550.79 | |
| Mountain soil (undiffe | 480.01 | |
| River wash | 1,386.81 | |
| Nueva Era | Bantay | 322.23 |
| Bantog | 684.15 | |
| Cervantes | 2,851.56 | |
| Faraon | 1,323.40 | |
| Maligaya | 543.11 | |
| Mountain soil (undiffe | 55,044.63 | |
| River wash | 6.12 | |
| Pagudpud | Annam | 5,148.83 |
| Luisiana | 2,355.38 | |
| San Manuel | 1,847.47 | |
| Umingan | 122.59 | |
| Mountain soil (undiffe | 12,848.70 | |
| Paoay | Bantay | 1,815.24 |
| Bantog | 191.30 | |
| San Fernando | 1,901.58 | |
| San Manuel | 1,555.24 | |
| Dune land (Sand Dune) | 1,820.58 | |
| Paoay Lake | Bantog | 261.20 |
| Pasuquin | Bantay | 2,829.26 |
| Bantog | 86.86 | |
| Bolinao | 8,246.60 | |
| Cervantes | 240.51 | |
| San Fernando | 157.94 | |
| San Manuel | 1,500.75 | |
| Tadao | 1,017.01 | |
| Rock Land | 1,982.90 | |
| River wash | 94.64 | |
| Dune land (Sand Dune) | 854.04 | |
| Piddig | Bantay | 226.91 |
| Cervantes | 9,298.67 | |
| San Fernando | 2,509.46 | |
| San Manuel | 39.91 | |
| Umingan | 578.97 | |
| River wash | 202.59 | |
| Pinili | Bantay | 3,540.13 |
| Bantog | 509.68 | |
| Cervantes | 194.95 | |
| Faraon | 570.51 | |
| San Fernando | 782.66 | |
| San Manuel | 720.41 | |
| San Nicolas | Bantay | 1,912.21 |
| Bantog | 1,123.19 | |
| San Fernando | 246.27 | |
| San Manuel | 294.25 | |
| Mountain soil (undiffe | 435.04 | |
| River wash | 11.60 | |
| Sarrat | Bantay | 5,517.66 |
| Bantog | 220.16 | |
| San Fernando | 1,513.87 | |
| San Manuel | 1,846.14 | |
| River wash | 126.83 | |
| Solsona | Cervantes | 6,336.29 |
| San Manuel | 2,061.89 | |
| Umingan | 2,379.88 | |
| Mountain soil (undiffe | 3,069.69 | |
| River wash | 1,465.52 | |
| Vintar | Bantay | 5,442.88 |
| Cervantes | 20,348.27 | |
| San Fernando | 708.23 | |
| San Manuel | 380.99 | |
| Tadao | 48.92 | |
| Umingan | 446.37 | |
| Mountain soil (undiffe | 20,880.09 | |
| River wash | 1,483.64 |
Soil Series
Properties limiting crop production
Management Recommendation
| Annam | Aluminum (Al) and Iron (Fe) toxicity (acidic soil); high phosphorus (P) fixation; run-off; sloping topography causes excessive erosion; low organic matter (OM) | Not suitable for irrigated lowland rice but moderately suitable for rainfed lowland and upland rice; fertilization | Green manuring; liming; large initial application of phosphate fertilizers; suitable for diversified crops; strip cropping | Liming; contour terracing; buffer strip cropping; addition of organic matter and animal manure to improve soil fertility and water-holding capacity |
| Bantay | Acidic; shallow soil limiting productivity of shallow-rooted crops; low K; moderate erosion | Adequate fertilization; OM addition; maintain properly the paddy dikes | Liming; adequate fertilization; OM addition or green manuring; practice contour tillage and strip cropping; use shallow-rooted 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 OM and available K | Suited for paddy rice; practice shallow cultivation when soil moisture is at optimum; K fertilization; adequate irrigation during dry season and construction of flood control system due to seasonal flooding in low areas | Construction of adequate drainage, irrigation and flood control systems 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 systems; application of organic matter and farm manure |
| Bolinao | Rolling topography in some areas which causes risk of erosion; shallow rooting depth; low in OM and available PK; slow permeability | Suitable for rainfed lowland and upland rice but needs terracing and use of limestone outcrops for reinforcing dikes; application of PK fertilizers | Contour terracing; proper fertilization; proper timing of cultivation and planting; addition of organic matter and animal manure to improve soil fertility and application of PK fertilizers | Contour terracing; use of cover crops for soil rehabilitation and source of firewood at the same time; addition of organic matter; timing of planting |
| Cervantes | Rolling to mountainous topography; severe soil erosion and runoff; low fertility | Suitable 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; fer | 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; reforestation of denuded areas |
| Faraon | Shallow effective soil depth; rock outcrops are present; rolling to hilly topography; moderate to severe soil erosion | Construction of bunds or terracing for upland rice; maintain properly the paddy dikes for rainfed lowland rice | Contour farming; shallow cultivation; fertilization; adequate irrigation system; minimum tillage to lessen erosion rates; suited for shallow-rooted crops | Moderately suitable to root crops due to shallow rooting depth and presence of rock outcrops; observe erosion control measures such as minimum tillage, cover-cropping and strip cropping |
| Luisiana | Low fertility; Fe or Al toxicity; low base saturation; very acidic; runoff; hilly topography | Liming upland rice; adequate P and K fertilization | Contour farming and cover-cropping; adequate fertilization | Best suited to root crops; OM incorporation to improve fertility |
| Maligaya | Difficult to cultivate when wet and hard when dry; poor drainage; slow permeability; low K | Practice shallow cultivation when soil moisture is at optimum; adequate K fertilization | Adequate fertilization and organic matter application; provide adequate drainage systems; use broadbeds, ridges, and mulching | Establish adequate drainage and irrigation systems; adequate fertilization; peoper timing of cultivation and planting |
| San Fernando | Low physiography subjected to seasonal flooding; waterlogged during rainy season; poor drainage; low OM | Suited for paddy rice; adequate fertilization and OM application | Plow when moisture conditions are ideal; apply green manure; timing of planting; some slightly elevated areas are suitable for sugarcane and corn; observe flood control measures due to seasonal flooding | Marginally suitable for rootcrops because of water logging during rainy season; timing of planting |
| 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 irr | Establishment of adequate drainage and irrigation system; regular addition of organic matter and animal manure to improve soil fertility |
| Tadao | Soil erosion and runoff; rolling topography; low K | Practice erosion control measures like terracing, construction of bunds with proper water outlets; proper amount, kind, and timing of fertilization | Soil erosion control measures: contour tillage, strip cropping, construction of grassed waterways or diversion ditches for excess water and runoff from adjoining uplands; crop rotation; fertilization; incorporation of compost and farm manure into the soil | Soil erosion control measures: contour tillage, strip cropping, construction of grassed waterways or diversion ditches for excess water and runoff from adjoining uplands; crop rotation; fertilization; incorporation of compost and farm manure into the soil; observe green manuring |
| Umingan | River flooding; gravelly subsoil layer causes drought; low OM | Application of fertilizer; clearing of large gravels and rock; incorporation of OM | 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 |