Soil Series Atlas

San Joaquin soil series

Fine, mixed, active, thermic Abruptic Durixeralfs

050100150cm1 ft2 ft3 ft4 ftApTopsoil · plowed0–15 cm · 0–6 inBt1Subsoil · clay build-up15–25 cm · 6–10 inBt2Subsoil · clay build-up25–41 cm · 10–16 in2Bt3Subsoil · clay build-up, different parentmaterial41–53 cm · 16–21 in2Bt4Subsoil · clay build-up, different parentmaterial53–66 cm · 21–26 in2Bqm1Subsoil · silica, cemented, differentparent material66–74 cm · 26–29 in2Bqm2Subsoil · silica, cemented, differentparent material74–122 cm · 29–48 in2BqSubsoil · silica, different parentmaterial122–152 cm · 48–60 in050100150cmApTopsoil · plowed0–15 cm · 0–6 inBt1Subsoil · clay build-up15–25 cm · 6–10 inBt2Subsoil · clay build-up25–41 cm · 10–16 in2Bt3Subsoil · claybuild-up, differentparent material41–53 cm · 16–21 in2Bt4Subsoil · claybuild-up, differentparent material53–66 cm · 21–26 in2Bqm1Subsoil · silica,cemented, differentparent material66–74 cm · 26–29 in2Bqm2Subsoil · silica,cemented, differentparent material74–122 cm · 29–48 in2BqSubsoil · silica,different parentmaterial122–152 cm · 48–60 in
Typical pedon, to scale: 152 cm (60 in), 8 horizons.

Alfisols — moderately leached soils with a clay-enriched subsoil

Nationally San Joaquin is a small series: 297,401 acres, 1,140th of 24,791 by area. It is the only series in the atlas that belongs to the great group Durixeralfs. It dates from 1900; only two atlas series are older. Every mapped acre is in California. It is the state soil of California.

Depth
Moderately deep
Drainage
Moderately well drained
Water movement
Very slow

Compare with another seriesSimilar series in the finder

Where San Joaquin is mapped

297,401 acres in 13 soil survey areas, from current SSURGO data.

AlabamaArizonaColoradoFloridaGeorgiaIndianaKansasMaineMassachusettsMinnesotaNew JerseyNorth CarolinaNorth DakotaOklahomaPennsylvaniaSouth DakotaTexasWyomingConnecticutMissouriWest VirginiaIllinoisNew MexicoArkansasCalifornia: 297,401 acresDelawareDistrict of ColumbiaIowaKentuckyMarylandMichiganMississippiMontanaNew HampshireNew YorkOhioOregonTennesseeUtahVirginiaWashingtonWisconsinNebraskaSouth CarolinaIdahoNevadaVermontLouisianaRhode Island

Share of all San Joaquin acres

  1. California100%
  • Rank in the state · share of its mapped soil
  • California 13th of 2,928 · 0.54%

In the field

Drainage

Moderately well drained

Drains fastStays wet

Soil depth

Moderately deep

ShallowDeep

6 other atlas series are classed moderately deep, none of them Alfisols.

Permeability

Very slow

SlowFast

5 other atlas series have very slow permeability, none of them Alfisols.

Parent material
Alluvium, igneous/metamorphic rock
Landform
Terraces
Type location
California

How it is classified

  1. OrderAlfisols
  2. SuborderXeralfs
  3. Great groupDurixeralfs
  4. SubgroupAbruptic Durixeralfs
  5. FamilyFine, mixed, active, thermic Abruptic Durixeralfsfine particle-size classmixed mineralogy classactive cation-exchange activity classthermic soil temperature regime

Against other Alfisols

San Joaquin makes up 0.11% of all mapped Alfisols — the 195th largest of 4,001 series in the order.

Solum thickness (topsoil + subsoil)

152 cm over a median of 127 cm

Depth to the subsoil

15 cm under a median of 23 cm

Its relatives

3 other established series share the family “Fine, mixed, active, thermic Abruptic Durixeralfs”

  1. San Joaquin297 k
  2. Redding212 k
  3. Eastbiggs13 k
  4. Yuvas6 k

Other Alfisols in this atlas

  1. San Joaquin152 cm · Abruptic Durixeralfs
  2. Amarillo251 cm · Aridic Paleustalfs
  3. Blount200 cm · Aeric Epiaqualfs
  4. Guyton203 cm · Typic Glossaqualfs
  5. Fayette185 cm · Typic Hapludalfs
  6. Loring165 cm · Oxyaquic Fragiudalfs

Horizon by horizon

HorizonLayerDepthThickness
ApTopsoil: plowed0–15 cm0–6 in15 cm
Bt1Subsoil: clay build-up15–25 cm6–10 in10 cm
Bt2Subsoil: clay build-up25–41 cm10–16 in16 cm
2Bt3Subsoil: clay build-up, different parent material41–53 cm16–21 in12 cm
2Bt4Subsoil: clay build-up, different parent material53–66 cm21–26 in13 cm
2Bqm1Subsoil: silica, cemented, different parent material66–74 cm26–29 in8 cm
2Bqm2Subsoil: silica, cemented, different parent material74–122 cm29–48 in48 cm
2BqSubsoil: silica, different parent material122–152 cm48–60 in30 cm

Sources: USDA–NRCS Official Series Description (revised 1999-09), Soil Classification database and SSURGO. Ranks computed by Soil Series Atlas. Method · Guides