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I_. Joaquin County, California
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<br /> ,,-jgable forage plants. The grazing system can be This unit may provide wetland functions and values.
<br /> aired by the occasional flooding. To control erosion, These should be considered in plans for enhancement
<br /> yes should be used to keep livestock out of gullies of wildlife habitat or land use conversion.
<br /> off streambanks. Where this unit is used for livestock grazing, general
<br /> "his map unit is in capability subclass Vllw management considerations include saturated soil
<br /> 0-17), nonirrigated. It is in vegetative soil group J. conditions in concave areas following rainy periods. The
<br /> characteristic plant community is mainly soft chess,
<br /> ` 7 c; —Yei1a�ri�r:c gravelly loam, 0 to 2 percent (oxtail fescue, wild oat, and filaree. Grazing should be
<br /> sig This moderately well drained, nearly level soil is delayed until the soil is firm enough to withstand
<br /> 4tream terraces. It is deep to a hardpan. It formed in trampling by livestock and the more desirable forage
<br /> ,hum derived from mixed rock sources. The native plants have had an opportunity to set seed. The unit
<br /> .,01ation is mainly annual grasses and forbs. Slopes responds well to range improvement practices, such as
<br /> Mane, and the landscape is characterized by seeding and applying fertilizer. The plants selected for
<br /> ,mocky microrelief. Meandering drainageways and seeding should be those that meet the seasonal
<br /> yed depressions fill with water to form vernal pools requirements of livestock, wildlife, or both. After seeding
<br /> ng the winter in some areas. Elevation is 110 to 270 is complete, grazing should be deferred until the plants
<br /> The average annual precipitation is about 17 have set seed.
<br /> ,Oes, the average annual air temperature is about 60 This unit is suited to irrigated row, field, orchard, and
<br /> gees F, and the average frost-free period about 260 vineyard crops. The main limitations are the very slow
<br /> permeability in the claypan and depth to the hardpan.
<br /> ypically, the surface laj er is pale brown and reddish Because of the restricted permeability in the claypan,
<br /> )w gravelly loam about 8 inches thick. The subsoil water applications should be regulated so that the water
<br /> Winds to a depth of about 62 inches. In sequence does not stand on the surface and damage the crops.
<br /> ►ward, it is 31 inches of reddish yellow, reddish The hardpan limits the suitability for deep-rooted plants.
<br /> on, and strong brown gravelly loam; 8 inches of Where feasible, deep ripping of this restrictive layer can
<br /> ^.g brown very gravelly clay loam; a claypan of help to overcome this limitation. A tillage pan forms
<br /> ig brown and light yellowish brown gravelly clay easily if the soil is tilled when wet. Chiseling or
<br /> 3 ,t 7 inches thick; 5 inches of very pale brown and subsoiling breaks up the pan. Careful applications of
<br /> Ig brown clay loam; and a very pale brown and light irrigation water are needed to prevent the buildup of a
<br /> —wish brown, weakly cemented hardpan about 3 high water table. Furrow, border, and sprinkler irrigation
<br /> Lr es thick. In some areas the surface layer is loam. systems are suitable. Returning crop residue to the soil
<br /> I icnuded in this unit are small areas of Hicksville soils or regularly adding other organic material improves
<br /> ainageways and Redding soils on terraces. Also fertility, minimizes crusting, and increases the rate of
<br /> �ded, in landscape positions similar to those of the water intake.
<br /> awlark soil, are small areas of soils that have a This unit is suited to irrigated pasture. Irrigation water
<br /> pan at a depth of 20 to 40 inches or that have a can be applied by sprinkler and border methods.
<br /> I gravelly loam subsoil at a depth of 15 to 20 inches. Leveling helps to ensure a uniform application of water.
<br /> -ded areas make up about 15 percent of the total Proper stocking rates, pasture rotation, and restricted
<br /> - rage. grazing during wet periods help to keep the pasture in
<br /> srmeability is moderately slow in the upper part of good condition and protect the soil from compaction.
<br /> 'ellowlark soil and very slow in the claypan. This map unit is in capability units IIs-3 (MLRA-17),
<br /> able water capacity is moderate. The effective irrigated, and IVs-3 (MLRA-17), nonirrigated. It is in
<br /> Ig depth is limited by the hardpan at a depth of 45 vegetative soil group D.
<br /> 0 inches. Roots are restricted to cracks and the
<br /> I�s of peds in the claypan, which is at a depth of 40 280--Yellowlark gravelly loans, 2 to 5 percent
<br /> inches. A perched water table is at a depth of 3 to slopes. This moderately well drained, gently sloping soil
<br /> = t for brief periods in the winter. Runoff is very slow, is on fan terraces. It is deep to a hardpan. It formed in
<br /> '.he hazard of water erosion'is slight. The rate of alluvium derived from mixed rock sources. The native
<br /> - Gntake in irrigated areas is 1.5 inches per hour. vegetation is mainly annual grasses and forbs. Slopes
<br /> Imbank erosion occurs along intermittent are convex, and the landscape is characterized by
<br /> ageways. hummocky microrelief. Deep, intermittent drainageways
<br /> 3st areas are used for livestock grazing. A few that have eroding banks are common. Elevation is 110
<br /> s are used for
<br /> irrigated crops or irrigated pasture. to 270 feet. The average annual precipitation is about
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