The purpose of this paper is to investigate therelation in more detail between the depth of availablesoil strata, the change of soil moisture and the growthof plants for landscaping. On the models of “Man-Made” Ground, the growth of Ricinus communis (HIMA) and zoysia matrella) KOHRAISHIBA) was examined with loam and perlite mixed.
(1) In case of more than 50cm depth, the changeof soil moisture became minute and soil moistureextraction pattern (SMEP) had not the definite te-ndency.
The number of leaves the height, the diameter of trunks, the fresh weight and dry weight of HIMAincreased as the depth of stratum. The loam and irrigation control had a very high growth.
(2) In case of less than 50cm depth, the moisturepercentage of loam became low, after few days ofrainfall, it became the permanent wilting point onless than 5cm depth. More than 30cm stratum, SMEP had the bind up pattern, The perloam showed higher value bind up pattern. The prrloam showed higher value than the loam, the dry tendency was defeated.
(3) The growth of KOHRAISHIBA was slow andalmost died on less than 5cm depth of loambed, and 3cm depth of perloam. Bat more than 10cm depth, it grew continuously upward. Then, 30 cdepth the growth was far advanced.
(4) The effect of irrigation was not clear for theincreased of dry weight but the height. And it leteffectivly down the “letale limit” to more thin stratum. The “vitale limit” was observed between 20cm and 30cm and it was valid as the standard of the “Man-Made” planting ground.
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