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t , ' { d.Kc.v. a +-* ,'-w. 'r k� ` : k Civ f..,r } t: -�. 4 >;jv: � y .bP�`-`z' z ft„k' ' ;" 3 rt #.. < ..�.-y .F s�,, y ell by ye ell 36-13oca fine sand . This soil is nearly level and poorly drained . It is on the flatwoods , but most of the acreage is in citrus groves . The mapped areas range from 10 to 200 acres . Slopes are smooth and range from 0 to 2 percent . Typically , the surface layer is dark gray fine sand about 7 inches thick . The subsurface layer is fine sand to a depth of about 20 inches . The upper 7 inches of the subsurface layer is grayish brown , and the lower 6 inches is brown . The subsoil is yellowish brown fine sandy loam to a depth of 24 inches . Below that is a layer of fractured limestone . Included with this soil in mapping are small areas of Jupiter, Pineda , and Riviera soils . Also included are soils that are similar to Boca soil but have limestone at a depth of less than 20 inches . The included soils make up about 15 percent of the map unit. f In most years , under natural conditions , the water table is within a depth of 10 inches of the surface for 2 to 4 months . It recedes to a depth below the limestone for about 6 months . Permeability is rapid in the surface and subsurface layers and moderate in the subsoil . The available water capacity is low in the surface layer, very low in the subsurface layer, and medium in the subsoil . Natural fertility and the organic matter content are low . Natural vegetation consists of sawpalmetto , pineland , threeawn , indiangrass , bluestems , panicums , south Florida slash pine , and waxmyrtle . Many areas of this soil are in citrus groves . Under natural conditions , this Boca soil is not suitable for cultivated crops because of wetness and shallow depth to bedrock. However, if intensive management practices and soil improving measures are used and a good water control system is installed to remove excess water rapidly, this soil is fairly suited to many vegetable crops . A good water control system is needed to remove excess water in wet seasons and provide for subsurface irrigation . Soil improving crops and crop residue should be used to protect the soil from erosion and maintain organic matter. Other good management practices are seedbed preparation , including bedding of rows , and applying fertilizer according to the need of the crop . This soil has fair suitability for citrus only if a properly designed water control system is installed . A water control system to maintain good drainage to a depth of about 4 feet is needed . Planting the trees on beds re lowers the effective depth of the water table . A cover crop should be maintained between the tree rows to protect the soil from blowing in dry weather and washing away during heavy rain . Regular applications of fertilizer and lime are needed . Boca soil has fair suitability for improved pasture grasses . Bahiagrass , pangolagrass , and white clover grow well if properly managed . Water control measures are needed to remove excess surface water after heavy rains . Regular applications of fertilizer and lime are needed . Grazing should be controlled to prevent overgrazing and to maintain plant vigor. The potential productivity of this soil for pine trees is high . Water control is needed before the potential can be attained . Seedling mortality , equipment limitations , and plant competition are the main concerns in management. South Florida slash pine is the preferred tree to plant. This soil is moderately suited to desirable range plant production . The dominant forage is creeping bluestem , lopsided indiangrass , pineland threeawn , south Florida bluestem , and chalky bluestem . Boca soil is in the South Florida Flatwoods range site . This soil has severe limitations for building site development, sanitary facilities , and recreational uses . Water control measures are needed to overcome excessive wetness . Sealing or lining of sewage lagoons and trench landfills with impervious soil material can reduce excessive seepage . Mounding may be needed for septic tank absorption fields. The sandy surface layer should be stabilized for recreational uses . Because of the moderate depth to bedrock , excavation is difficult . The use of special equipment may be required . This Boca soil is in capability subclass Illw .