HOW WILL CHINA’S ADOPTION OF GENETICALLY MODIFIED SOYBEANS AFFECT GLOBAL SOYBEAN MARKETS?

Abstract

China began commercial planting of genetically modified (GM) soybeans in 2024 after two decades of regulatory caution. Because China buys about two-thirds of the soybeans traded worldwide, exporters ask whether higher domestic yields will cut its imports and depress world prices. This paper works through three channels: yield gains on existing soybean land, land reallocation between corn and soybeans, and slower structural change in the countryside. Three results follow from official statistics, variety-trial data, and the U.S. adoption record. First, trial yield gains of 5–10 percent applied to China’s 10 million hectares of soybeans add 1–2 million tons, one to two percent of the 105 million tons imported in 2024, and would lower world prices by about one percent. Second, Heilongjiang cost-and-return data show that soybeans would need a 32 percent yield gain to match corn’s per-hectare return without subsidies, three times the largest trial gain reported for an approved GM soybean variety; and because GM corn is being commercialized on the same timetable, the yield channel leaves relative profitability almost unchanged. Third, in the United States, where adoption became near-universal, GM adoption is not associated with higher average yields once the common breeding trend is absorbed by year fixed effects. GM adoption will not cut China’s imports in the short run. Any larger effect would come from land consolidation, rural aging, and the subsidies that already carry the soybean sector, not from the seed itself.