Soil solarization using transparent polyethylene sheet is followed in some specific cases, where rise in temperature up to 50-55 0 C had been reported. Soil sterilization in oven (650 watt) is also reported. What is meant by "cooking" is not clear. Suitable method may be chosen as per objective of the work.

Cooking will remove most of the soil microorganisms, but not necessarily all. It will also change soil organic compounds chemically. Note, that you might introduce microorganism by your plant. You may surface sterilize seeds.

If you don't like the fresh soil taste, of course, you can cook it!

The simplest technique to sterilze a solid is to heat it to a proper temperature according to the level of desired sterilization. This is accomplished with a oven which has a controled temperature system. Concerning the soil, the total sterilizaton is reached when the soil becomes liquid, i.e. lava.

How about cooking it at above 100 degree celsius for 30 minutes ? ?

Follow the procedure required for sterilization of specific microorganism for soil and test the plant. This also includes standard method of Soil sterilization. 

Soil solarization is the best way to steralize the soil. It all depends on purpose of study.

What do you mean by "cooking"? Dry autoclaving?

Cooking? By Dry autoclaving

Yes, you may sterilize the soil in an autoclave.

Nevertheless, you will dissolve some organic matter; is it disadvantegeous for your purpose?

Cooking using a pan in a hotplate at above 100 degree C ?? for a bit of convenience maybe ? if it could make my results bias then , not gonna follow that methods then .

The sterlization  is generally needed to protect plant roots from fungus or other  plant root damaging soil organisms i/c bacterias, actinomyctes, spores, etc.  The best approach is to apply suitable fungicide to seeds before sowimg . If any how it is essential, cooking by no means gives a non-destructive solution.  You should think of heating without degrading soil organic matter or apply radiation treatment .

Dear colleagues, we had earlier three discussions on similar aspects in researchgate which may be consulted for better appreciation of the subject.

Can any one recommend a protocol to sterilize a soil for..

Does any one has an idea how to sterilize a soil..

What is the best way to remove bacteria from soil..

I didn't understand your term "cooking".  If you mean sterilizing-Potting soil is sterilized to offer your plants the best growing environment possible by killing weed seeds or disease organisms that might be lingering in the soil.

I) For small batches: Use preheated oven (110 C) for 45 min or a microwave for 10 minutes on full power.

II) For large batches: Select a spot in the field that receives at least 6-8 hours of continous sun during the day. Bake in the sun for at least 4 weeks in hot, sunny weather and up to 6  weeks in cooler weather.

Good luck

Can I sterilize a soil by cooking it ? -  ResearchGate. Available from: https://www.rAdd your answeresearchgate.net/post/Can_I_sterilize_a_soil_by_cooking_it [accessed Mar 31, 2016].

Sterilizing soil is a function of time, temperature and pressure. For autoclave sterilization the temperature of sterilization is 121 C for at least 20 minutes in an autoclave and researchers generally treat on one day and retreat a second day.

Soil solarization can remove many soil borne pathogens without complete sterility. It can avoid the biological vacuum from full sterilization procedures. The wetting of soil and covering with a clear plastic sheet can remove many soil pathogenic fungi, bacteria, weed seeds and parasitic nematodes.

Twenty to 40 days of treatment may be needed and if the farmer research has the time it may be cost effective and safer on the environment than chemical fumigations and agrichemical treatments.

For more information google soil solarization for your crop and conditions.

The tropical environment of Mindanao should be ideal for soil solarization techniques.

sterilizing soils with hot steam is a common practice in horticulture, especially for greenhouse soils, just ask of those practitioners in your surrounding, they even may be able to help you out with the equipnet.