Agriculture

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Across
  1. 5. lever system of irrigation
  2. 6. Modern irrigation system that is useful on uneven surfaces
  3. 7. Natural fertilizer rich in humus
Down
  1. 1. _________ symptom also called pulley system
  2. 2. Man-made inorganic salt
  3. 3. The _______ system is the most efficent modern irrigation system
  4. 4. Well (irrigation system)