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.