1 Subjects: “...soilless culture...”

2 Subjects: “...flow culture...”

3 Subjects: “...cross-cultural comparison...”

4 Subjects: “...fungus culture filtrate...”

5 Subjects: “...fungus culture filtrate...”

6 Subjects: “...fungus culture filtrate...”

7 “... of crops, populations and technologies. They were and remain a locus for cultural interaction...”