|My son has a project to do on siol. we need ideas on how to do this project . We would very much appreciate it if you|
I would need more information to be very helpful with this question. As a general guide if I understand the question well I suggest you consider comparing various soils for how long they hold enough moisture to support plant growth (how soon does a plant wilt; or compare soil with and without compost added (also various rates or types of compost).
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