Which if the following is true about a soil quality index (SQI)?
A) Soil quality indices may be used to monitor the effects of changes in soil management practice over time.
B) The SQI must be related to a particular functional goal for the soil in the ecosystem.
C) Soil pH, bulk density (Mg m-3 ) and soil active C levels (mg kg-1 ) may all be averaged together in a SQI.
D) All of the above are true.
E) None of the above is true.
Question 2
In recent years the annual productivity of slash-and-burn systems has tended to decline over that achieved by the traditional shifting cultivation systems of the past. To what is this decline most likely due?
A) reduction in the C/N ratio of the soil organic matter
B) reduction in the use of fertilizers
C) increase in the period of food production in a given cycle
D) failure to grow legumes in the cropping system
E) decrease in the length of the fallow period
Digital rectal exam (DRE). The physician’s index finger is inserted into the rectum and pressed agai
Types of Soil Porosity
Soil bulk density
Slopes and Soil Development
Photo of earthworm on soil