This paper presents an extensive experimental investigation on the use of ground improvement techniques and biotechnological applications on earth science. In recent years, investigations in geomicrobiology have enabled significant advances in understanding the effect of microorganisms in the development of the soil behaviour. In this paper, a series of experimental study was conducted to investigate the applicability of biotechnologies in soil stabilization. Unconfined Compression and California Bearing Ratio (CBR) tests were employed during the experimental works for an assessment of two soil parameters of major importance - namely, compressive strength and bearing capacity. From the experimental results, it was observed that the unconfined compression strength and the CBR values of the sand increased with an increase of curing time.