Which of the following statements is not correct about the ecological effects of agricultural activities?

A. The use of herbicides and pesticides in farms can cause pollution
B. Bush-burning encourages desertification
C. Excessive use of fertilizers in farms may have harmful effects
D. Tillage of tropical soils with ploughs and harrows may encourage erosion
E. Monocropping is one of the cultural methods of controlling pests.  

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Correct Answer: E