According to Dr. Burras, soil is a non-renewable resource. - True
According to your textbook, researchers have demonstrated that organic farming ______________ - is
equally, if not more profitable than conventional farming
Accelerated erosion is much more rapid than geological erosion. - True
Shelterbelts are to _____________ as terraces are to ________________ - wind erosion; water erosion
Current annual average soil erosion rate in Iowa is ____________. - ~ 5.6 tons/acre
Ideal soil for plant growth has - 50% pores and 50% solids
Which of the following is true about soil rich in organic matter? - all of the above
retains more water
has good nutrient retention
is well aerated
Which of the following is NOT true for Green Revolution? - decreased per capita food production in Asia
According to your textbook, what are the pros of no-till farming? - all of the above
soil erosion is generally reduced by 90%
labor may be reduced by 30-50%
soil retains more moisture
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