Across
- 1. rotation the practice of planting different crops sequentially to restore soil nutrients
- 3. leaving a field unplanted for a season to let the soil recover
- 4. a modern machine that harvests,threshes , and cleans simultaneously
Down
- 2. a 19th century machine invested by Cyrus McCormick to cut small grains
- 5. a system supplying controlled amounts of water to crops