特定の穀物作物の生産における特定の国の支配に寄与するいくつかの要因は何ですか？さまざまな地域でシリアルの生産を多様化する努力はありますか？
What are some factors that contribute to the dominance of certain countries in the production of specific cereal crops? Are there any efforts being made to diversify the production of cereals across different regions?