I need to test the physc-chemical parameters of soil from irrigation areas for nutrient test. most of the time scientist suggested that if talk sample in 1-15 and 15-30 cm it is good sampling. so is other method to talk sample?
Hello.
Your sampling protocol is a function of your objectives and your money. There are many protocols including random sampling, stratified random sampling, grid-point sampling, grid-cell sampling, zig-zag sampling, etc.
Stratified random sampling is applicable when the researcher has the ability to delineate the study area into strata, for example slope classes because the concept is soils in a stratum have similar characteristics, then randomly sample.
Grid-point sampling is mostly used for precision agriculture.
The depth of sampling is depended on the objectives in that if u want to plant shallow rooted crops you need top depth only. Taking samples in both depths means double the cost per point.
Incase of 2 depths, I recommend 0-20 and 20-40cm. But 0-15 and 15-30 is also acceptable.
Thanks.
Hello.
Your sampling protocol is a function of your objectives and your money. There are many protocols including random sampling, stratified random sampling, grid-point sampling, grid-cell sampling, zig-zag sampling, etc.
Stratified random sampling is applicable when the researcher has the ability to delineate the study area into strata, for example slope classes because the concept is soils in a stratum have similar characteristics, then randomly sample.
Grid-point sampling is mostly used for precision agriculture.
The depth of sampling is depended on the objectives in that if u want to plant shallow rooted crops you need top depth only. Taking samples in both depths means double the cost per point.
Incase of 2 depths, I recommend 0-20 and 20-40cm. But 0-15 and 15-30 is also acceptable.
Thanks.
Samuel is correct, but if you are specifically asking about depths, those two are fine for crops that are not deep rooted. However, the additional general practice is to avoid sampling across soil horizons.
thankyou Paul and Samuel, yes am asking the bast depths for crops.
I think the best way is to take 0-20 cm depth since nutrients might not be significant at 30cm
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