Question

A farmer grows a deep-rooted pulse after a shallow-rooted cereal and wants to exploit different soil layers for moisture and nutrients. Which principle of crop rotation is being used most directly in this situation?

A Different crops always require identical nutrient ratios
B Deep-rooted crops necessarily fix more atmospheric nitrogen
C Shallow-rooted crops prevent all nutrient leaching
D Rooting depth has no relevance to crop sequence
E Different rooting patterns reduce competition for the same soil zone
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