Abstract
A glasshouse experiment was carried to identify effects of the application rate of ground silicate rock as a multinutrientfertilizer (SRF) with and without organic matter (OM) on growth and nutrient status of food crops (rice,corn, and soybean). Those crops were grown on 3 different soils in 2 cropping patterns, i.e., rice – soybean and corn– soybean, providing 6 experimental sets. A completely randomized design was applied in each experimental set.The treatment in each set consisted of 3 rates of SRF (5, 10, and 15 g kg-1), those 3 rates + 5 g kg-1 of OM, and acontrol (without adding SRF or OM). The first crops (rice and corn) were grown up to 65 days, while the secondcrop (soybean) was up to 40 days. Results indicated that for crops grown on less fertile soils, the application of SRFonly slightly increased growth of crops, mainly of the 2nd crops, and adding OM greatly increased the growth ofboth the 1st and 2nd crops. In those experimental sets, about 60 – 80% of the variation of crop growth was significantlydetermined by concentration of Cu and several other essential nutrients in crop tissue. In contrast, the growth forcrops grown on more fertile soils was not affected by the application of SRF or/and OM. It was concluded thatadding OM enhanced the effectiveness of SRF as a multi-nutrient fertilizer, and that may be used as an appropriatemulti-nutrient fertilizer or general ameliorant to sustain soil quality and remediate the nutritionally disorder soils.
Highlights
Among solid phase treatment technologies, landfarming has distinctive advantage for stimulating the native soil bacteria that are enriched in the soil by presence of contaminants but that are constrained in their degradation capability by limiting factors such as inadequate aeration, poor contact of microorganisms with the contaminants and insufficient nutrients (Hansen et al 2004)
Bioremediation experiments of petroleum oil sludge were undertaken in small scale of 25 kg or the ratio is 1 : 100 from the actual bed of field scale process
The petroleum oil sludge pollutant has many components, it can be seen in the Figure 1 and 2 the chromatogram initial condition and after 70 days incubated by using the Xanthobacter Autotrophicus bacteria
Summary
Among solid phase treatment technologies, landfarming has distinctive advantage for stimulating the native soil bacteria that are enriched in the soil by presence of contaminants but that are constrained in their degradation capability by limiting factors such as inadequate aeration, poor contact of microorganisms with the contaminants and insufficient nutrients (Hansen et al 2004). The biodegradation potential of hydrocarbons is defined by their chemical composition, and by the biological, physical and chemical characteristics of the soil environment (BetancurGalvis et al 2006). The rate at which microbial cells can covert chemicals during bioremediation processes depends on the rate of uptake and. Studies have shown that bacterial degradation was altered greatly by the physical and chemical features of the heterogeneous microbial environment (Tang et al 2005)
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