This study aimed to investigate the possibility of eliminating cadmium (Cd) from contaminated agricultural soil using a combination of microbial inoculants of Penicillium chrysogenum fungus and Bacillus licheniformis with Limnocharis flava plants. Limnocharis flava (L. flava) and microbial inoculants with four Cd levels, including 2.05 (T1 control), 5 (T2), 10 (T3), and 20 mg/kg (T4), respectively, were tested in green house conditions. Cd accumulation was evaluated to assess the safety limit of the Cd concentration in the edible parts of L. flava. The results showed that the application of the microbial inoculants facilitated the stress tolerance of the plants caused by a Cd accumulation in the soil matrix. The use of Penicillium chrysogenum and Bacillus licheniform in combination with L. flava increased the Cd accumulation in plant biomass. The total Cd after the experiment varied between 4.86 and 18.44 mg/kg in dry, clean soil, equivalent to reduction rates of 2.80, 4.40, and 7.80%, respectively. Meanwhile, the availability of Cd in soil was significantly reduced by 12.50, 13.04, 13.33, and 13.93%, respectively. Consequently, the microbial inoculants helped the plants to grow healthily, increased the yield, and reduced the total and available Cd content of contaminated agricultural land up to a concentration level of 5 mg/kg.

The Central Highlands including 4 provinces lie in the western central region. In Vietnam there are 2,396,800 ha of soils generated from weathered basalts, in which more than 60% are located in the Central Highlands. Soils originated from weathered basalts are considered precious with the most magnificent soil depth and fertility among soil associations derived from basic and neutral magma. Hence, these soils are suitable for numerous crops, especially cash crops like coffee, rubber, pepper, etc. However, recently extensively planting of some crops, namely coffee, tea, fruit-tree, etc., and expanses of cultivated land for foods of many migrant farmers have resulted in deforestation, both natural and planted forest, gone out of control, vegetation cover evidently reduced giving rise to frequent and severe floods. Long drought, lowered groundwater-level have made thousands ha of yield loss coffee plantation to be cut down, and bring adverse impacts on productivity of other irrigated crops. Both excessive and unsound fertilizer utilization by rich house holders or putting down fewer fertilizer by the poor not enough to recover soil nutrients have caused critical soil degradation (Dai et al., 2001) Now there have been plenty of fundamental investigations carried out on soils, land use, most of which are stored, managed with manual, single and not systematic approach. Therefore, to look up or update data have been much more difficult. The qualitative and quantitative land resources inventories by utilization types and impact assessments are oriented towards suitable land use lay out on basalt soils for agricultural activities in the Central Highlands, that bring into play the advantages and overcome the shortcomings in building development strategies, giving guidance in production and initiating technology solutions guaranteed for economically effective and sustainable land use. So, to establish the information system on land resources