1 Subjects: “...triple-rice cropping system...”

2 Subjects: “...crop production...”

3 Subjects: “...mixed cropping...”

4 Subjects: “...crops...”

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

6 “...-being. In the past four decades, rice has also become a commercial crop of great importance to Mekong...”