Fertilizer stocks moved sharply lower Wednesday after a European producer lowered its sales guidance and said that it was cutting prices for potash.

Germany-based K+S also said that it hasn't seen a demand recovery in Europe. Meanwhile, Briefing.com

reported that, since farmers have some flexibility in when they apply potash to fields, the reduced demand for potash may be occurring as farmers cut back. In addition, planting delays in the U.S. may be hurting fertilizer producers as well.

As a whole, the Agricultural Chemical and Fertilizer Stocks Index is down by -4%. It currently lags the S&P 500 by -7.7% over the last month.

Firms specializing in potash are falling the furthest, with Potash (NYSE: POT - News), Mosaic (NYSE: MOS - News), Agrium (NYSE: AGU - News), and Intrepid Potash (NYSE: IPI - News) all down at least -7% on the day.

Terra Industries (NYSE: TRA - News), Terra Nitrogen (NYSE: TNH - News), and CF Industries (NYSE: CF - News) are also getting hit in the sell-off with all three trading down by at least -3%.

As of this writing, the Agricultural Chemical and Fertilizer Stocks Index is one of the 15 worst-performing tickerspy Indexes over the last month, down by by -4.6%.

Investors can follow the Agricultural Chemical and Fertilizer Stocks Index and view related performance charts and metrics at tickerspy.com.

Fun and informative, tickerspy.com is a free investing website where you can track multiple stock portfolios and compare against 250 proprietary Indexes tracking themes from nanotech to agriculture to precious metals. Best of all, tickerspy.com lets you spy on the portfolios of nearly 3,000 Wall Street institutions and hedge funds and see graphs of their performance. Try tickerspy.com today and find out how you stack up against investing legends like Warren Buffett!