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Pesticides may kill soil micro-organisms that decompose humus to release mineral salts. In this way they interfere with nutrient cycling. 
Overuse of chemical fertilizers and pesticides have effects on the soil organisms that are similar to human overuse of antibiotics. Indiscriminate use of chemicals might work for a few years, but after awhile, there aren't enough beneficial soil organisms to hold onto the nutrients” (Savonen, 1997).
1. 1989 Q4 P1
State how excessive use of pesticides may affect soil fertility 2. 1989 Q8 P1 The table below shows a list of five human diseases. Complete the table by naming the causative agent of each. The first one has been completed for you. 
Human Diseases
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