The table illustrates crop rotation sequences in a backyard garden over four years. Identify the farming system and the crops A, B, C, and D.

Each plot has a different crop each year, with crops rotating across plots.
This prevents soil depletion and maintains fertility.
Crop rotation

Crop A: legume plant (bushy/tree symbol).
Legume (e.g., clover)

Crop B: grass-like plant.
Cereal (e.g., wheat)

Crop C: carrot symbol.
Root crop (e.g., carrot or turnip)

Crop D: tall fodder plant.
Fodder (e.g., barley or oats)

crop rotation; A: legume, B: cereal, C: root crop, D: fodder crop