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What type of soil is mostly found in the village of Uparvedi ?
In which way is the stream utilized by villagers 2what type of soil mostly found in the village of Apradh Devi
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To make a Soil classification based on fertility levels, how many number of samples would mean a representative sample? Suitable statistical method?
I would like to study soils in a defined geographic region in India. I plan to collect soil samples from different locations and analyse fertility parameters: pH, CEC, electric conductivity, 12 plant available nutrients, water holding capacity... Further classify soils with respect to fertility status.
1) I can take 100 samples or 1000 samples.. However excess number of samples has implications of cost and time.. Less number of samples would lead to insufficient basis for classification. How do I find appropriate number of sampling points required for such classification.
My activity so far: At field visit, farmers usually indicate that there are 4 - 6 different soils around their village (the nomenclature is more or less similar in other villages).
Likewise I visited 7 villages across 5 subdistricts and collected samples from each of these soil types that villagers identified to be distinct. Now I have soil analysis results for around 24 samples and I need to know, 1) if the number of samples are sufficient to represent the region (which statistical analysis ll help me?)
2) There ll be variation in values of each of these soil type identified by villagers, How much variation is acceptable within a soil type and beyond which, the soil should be classified to be a different type despite physical/ visual resemblance?