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52 area should have a proper depth of topsoil in which the feeding roots ofgrass can develop, there are many instances where for purposes ofeconomy or otherwise a sufficient depth of topsoil is not provided. The first step is to determine the depth of topsoil which is to be finallyspread over the finished subgrade of the lawn. The less the depth oftopsoil the greater will be the cost of future maintenance over a periodof years succeeding the first year. The surface of the finished subgradeshould be established to conform with the finished grade of the lawnarea and at a definite, even depth below this finished grade of this lawnarea. No topsoil should be spread over this subgrade until every pre-caution has been taken to be certain that an excessive depth of topsoilwill not be necessary where spots of extreme depression can be locatedin the surface of the subgrade and previously filled. In sections of thecountry where the subsoil consists of a clay loam and other types ofheavy soil the item of providing topsoil for the preparation of the lawnarea is one of the most expensive items in the landscape developmentof the property. Experience has shown that topsoil is one of theitems which is often subjected to the greatest amount of waste, andit should be carefully conserved and not used, in any instance, exceptto the correct depth as required. |
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