Soil Series Atlas

Hilo soil series

Medial over hydrous, ferrihydritic, isohyperthermic Acrudoxic Hydrudands

050100150cm1 ft2 ft3 ft4 ftAp1Topsoil · plowed0–18 cm · 0–7 inAp2Topsoil · plowed18–46 cm · 7–18 inBw1Subsoil · color or structure change46–66 cm · 18–26 inBw2Subsoil · color or structure change66–84 cm · 26–33 inBw3Subsoil · color or structure change84–150 cm · 33–59 in050100150cmAp1Topsoil · plowed0–18 cm · 0–7 inAp2Topsoil · plowed18–46 cm · 7–18 inBw1Subsoil · color orstructure change46–66 cm · 18–26 inBw2Subsoil · color orstructure change66–84 cm · 26–33 inBw3Subsoil · color orstructure change84–150 cm · 33–59 in
Typical pedon, to scale: 150 cm (59 in), 5 horizons.

Andisols — soils formed in volcanic ash and similar material

Nationally Hilo is a small series: 29,884 acres, 8,289th of 24,791 by area. It is the only series in the atlas that falls in the medial over hydrous particle-size class. Every mapped acre is in Hawaii. No other established series shares its family class. It is the state soil of Hawaii.

Depth
Deep
Drainage
Well drained

Compare with another seriesSimilar series in the finder

Where Hilo is mapped

29,884 acres in 1 soil survey area, from current SSURGO data.

1.3%

of all mapped soil in Hawaii is Hilo: 29,884 acres, the 13th most extensive of 269 series mapped there.

Hawaii29,884 acres · 13th of 269 series

In the field

Drainage

Well drained

Drains fastStays wet

61 other atlas series are well drained, none of them Andisols.

Soil depth

Deep

ShallowDeep

Harney and Natchez also are classed deep.

Parent material
Residuum, volcanic ash/tephra
Landform
Ash fields
Major land resource areas
159A
Type location
Hawaii

How it is classified

  1. OrderAndisols
  2. SuborderUdands
  3. Great groupHydrudands
  4. SubgroupAcrudoxic Hydrudands
  5. FamilyMedial over hydrous, ferrihydritic, isohyperthermic Acrudoxic Hydrudandsmedial over hydrous particle-size classferrihydritic mineralogy classisohyperthermic soil temperature regime

Against other Andisols

Hilo makes up 0.15% of all mapped Andisols — the 175th largest of 1,093 series in the order.

Solum thickness (topsoil + subsoil)

150 cm over a median of 105 cm

Depth to the subsoil

46 cm over a median of 20 cm

Its relatives

Other Andisols in this atlas

  1. Hilo150 cm · Acrudoxic Hydrudands
  2. Tokul157 cm · Aquic Vitrixerands
  3. Threebear175 cm · Oxyaquic Udivitrands

Horizon by horizon

HorizonLayerDepthThickness
Ap1Topsoil: plowed0–18 cm0–7 in18 cm
Ap2Topsoil: plowed18–46 cm7–18 in28 cm
Bw1Subsoil: color or structure change46–66 cm18–26 in20 cm
Bw2Subsoil: color or structure change66–84 cm26–33 in18 cm
Bw3Subsoil: color or structure change84–150 cm33–59 in66 cm

Sources: USDA–NRCS Official Series Description (revised 2012-05), Soil Classification database and SSURGO. Ranks computed by Soil Series Atlas. Method · Guides