I am working on an experiment to determine the effects of Cadmium on Rice plant growth, the uptake of cadmium by rice roots and also the remediation effect and benefits of biochar.
I'm using a pot which holds 2kg soil of 18cm height and 15cm diameter I'm considering the experiment till maturity. I'm so far done with my calculations as to how much of each factor to add. Please my question is which of the factors do I add first. Should I add the biochar first or should I spike the soil with the cadmium first. Also with the spiking do I add the Cd to the soil directly or do I have to dissolve it in water.
Hi Aurelia, First of all, you should think about the practical application. In my point of view, you should add cadmium to soil and maintain control treatments only with cadmium in soil and along with this, your experiment will be the addition of biochar to the cadmium containing soil.
Cd + Soil ------- Control treatments
Cd + Soil + Biochar ------- Experimental treatments
Because forms (availability) of Cd can be changed with time after its addition to the soil, it is better to incubate soils (with Cd) before the cultivation with Biochar treatment.
Article Changes in the Forms of Cadmium with Time in Some Western Au...
It is much better to use soil samples that already contain the Cd by natural accumulation, so that the results are more real and serve immediately. I do not know how difficult it would be to send soil samples from here, but we have some cocoa producers whose samples of both tissue and soil tested positive for Cd.
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