Online Soil Information

Simple Soil, Water and Plant Testing Techniques for Soil Resource Management

ftp://ftp.fao.org/agl/agll/docs/misc28.pdf

Soil management: compost production and use in tropical and subtropical environments

http://www.fao.org/3/a-s8930e.pdf

Assessment of Soil Nutrient Balance

http://www.fao.org/3/a-y5066e.pdf

Soil Survey Field and Laboratory Methods Manual

http://www.nrcs.usda.gov/Internet/FSE_DOCUMENTS/stelprdb1244466.pdf

Kellogg Soil Survey Laboratory Methods Manual

http://www.nrcs.usda.gov/Internet/FSE_DOCUMENTS/stelprdb1253871.pdf