soils

For example, certain soils (mainly clays, very fine grained soils) compress and undergo consolidation (i.e.

That's one of the main factor that kills the soils and force the agriculture to use synthesized-fertilizer.

Just like your digestive system, soils contain critical populations of Beneficial Microorganisms which are a requirement for crop production.

Heads with acceptable wear rates in hard rock or soils will likely have unacceptably high wear rates against metals.

This seems counter intuitive, since the plant would on rocky hard soils, have much fewer nutrients to draw from.

Many areas in the Bay Area are built on land fill (like areas of SF) or bay bottom soils.

An instrument for boring or perforating soils or rocks, for determining the quality of soils, or the nature of the rocks or strata upon which they lie, and for obtaining water.

Also, weren't many soils in Africa destroyed by the use of the wrong kind of fertilizer?

Increased salinity of soils is a big issue anywhere where groundwater is used for irrigation and there isn't much rain.

Basically, different plants absorb different amounts of cadmium, and different soils have different levels of it, and it's all influenced by whether large human developments are churning Cd into the soils nearby.

As far as I know, cutting heads that could bore soils/rock could not also bore through metal lining.

Historically, I think most of the time food shortage was caused by climate problems (bad weather, eroding soils, etc).