He says that is because the farmer used rich soil to produce the sod, so it might not do well in clay soils.

VOA: special.2009.07.07

In June,students at the Agroecology Summer Intensive Program begin taking courses like Introduction to Soils.

VOA: special.2009.04.14

Cindy Haynes says little or no fertilizer is needed in fertile soils.

VOA: special.2009.02.17

She says that the goods and services provided by nature - like clean air, rain or fertile soils - should not be taken for granted.

VOA: standard.2010.02.24