tariffs may be part of the reason, but definitely not the whole story. I know this article is about corn, but evidently the same can be said for soybeans...89 bushel avg is unreal! congrats!
but there were record highs for corn and soybeans in 2007/2008 and again in 2012, when beans hit $17.50 and corn hit $8.05 per bushel (wow), and both have been on a steady decline since then...
https://www.marketwatch.com/story/corn-prices-down-nearly-4-as-usda-forecasts-second-largest-crop-on-record-2018-09-12?link=MW_latest_news
"Corn prices dropped Friday, set to mark their largest one-day percentage decline in over a year, after the
U.S. Department of Agriculture said U.S. corn production for the 2018/2019 crop year may climb to the second highest level on record. It forecast corn production at 14.827 billion bushels, up 241 million from last month's forecast. Record high yield estimates of over 181 bushels per acre for corn harvested in the United States raised the production and ending stock levels versus last month's estimates," said Sal Gilbertie, president and chief investment officer at Teucrium Trading LLC. "The fact remains that both global and U.S. corn usage is rising versus last year, while ending stock levels are falling." December corn
CZ8, +0.72% lost 14 1/2 cents, or nearly 4%, to $3.52 1/4 a bushel in Chicago. Prices for a front-month contract haven't seen a single-session percentage drop that big since August of 2017, according to FactSet data."