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3 years ago in Agronomy , Pedology By Adi

When sampling soil from rice terraces, where and how many samples are needed?

My research aims to map nutrient variability across traditional rice terraces. The topography creates distinct micro-environments, making random sampling seem inadequate. I need a field-tested protocol that balances statistical rigor with the practical constraints of steep, flooded terraces to ensure my data accurately represents the entire system.

 

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By Usha K Answered 1 year ago

From my fieldwork in Southeast Asian terraces, I recommend a stratified approach. First, treat each terrace as a distinct stratum. Within each, use a W-pattern or grid to collect 8-12 sub-samples from the plow layer (0-20cm), avoiding bunds and water inlets. Composite these into one sample per terrace. For a small system, sample every terrace; for larger ones, stratify by position (top, middle, bottom of the slope). I've found this captures the variability induced by water flow and management history. Always take more sub-samples than you think you need it's cheaper than returning to the field.

 

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