Which of the following are key components of conservation agriculture that enhance water use efficiency in dryland farming systems?

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Minimizing soil disruption by adopting no-till or reduced tillage methodsReturning crop residues to maintain a minimum of 30% soil surface coverageImplementing crop rotation to optimize the use of water and nutrientsAll of the above

Explanation

Conservation agriculture improves water use efficiency in dryland systems through several practices: reducing soil disturbance with no-till or minimum tillage, retaining crop residues to cover at least 30% of the soil, and rotating crops to better utilize available water and nutrients. Therefore, all the listed components collectively contribute to its effectiveness.