Experts predict that the worlds population will exceed 10 billion people by 2025.
Indicate whether the statement is true or false
Question 2During the 1990s, the rate of increase of food production has declined.
Indicate whether the statement is true or false
Question 3In which region of the world does overall crop removal of nutrients significantly exceed the return of these nutrients in crop residues and chemical fertilizers?
A) Asia
B) Latin America
C) Europe
D) North America
E) Africa
Question 4Which 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 5In 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
Question 6Which of the following is true of organic farming as certified in Europe, the USA and many other countries?
A) Organic farms can use only animal manure to supply nutrients and build soil organic matter.
B) Improvement of soil quality is an official goal of organic farming.
C) The burning of all plant residues is encouraged in organic farming.
D) Organic farmers are allowed to use only organic chemicals (those containing carbon).
E) Organic farmers can use only compost made form plant materials to supply nutrients and build soil organic matter.
Question 7To enable the most consistent and appropriate interpretations, all soil samples submitted to a particular soil test lab should be taken from the same soil depth, regardless of differences in the type of tillage used or plants grown.
Indicate whether the statement is true or false
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