Question Statement:
Which of the following agronomic practices are classified as biological conservation measures for controlling water erosion on gently sloping croplands?
Options:
- (A) Contour farming (plowing and planting along contour lines perpendicular to slope)
- (B) Strip cropping (alternating erosion-permitting row crops with erosion-resisting dense cover crops)
- (C) Mulching with crop residues to absorb raindrop impact energy and minimize surface sealing
- (D) Graded bench terracing with masonry drop structures