Farmers in Argentina have so far sold 72.6% of the 2021/22 soybean harvest, the agriculture ministry said on Wednesday lagging the 75.6% sold at the same point a year ago. Soybean sales boomed to 13.3 million tonnes in September, driven by a temporary preferential exchange rate for producers, but have slowed since, leading the government to analyze bringing back the so-called "soy dollar" FX rate.