In his letter "Chewing up ag land" (Oct. 13), Eric Schmidt asks, "Where do we draw the line on all the developing going on of prime ag land in Fresno County?" An answer is that we draw the line according to clay content of soils.
Clay holds plant nutrients. Too little and plants starve. Too much and they drown. Also, clay belts under the ground, called hardpan, limit root growth and stunt plants. These soils are unproductive for farming but suitable for development.
Testing easily determines which soils are suitable for development.
Developing on soils suitable for farming is a mistake that cannot be undone.
An old saying about Valley farmland: They don't make it anymore.