In trading on Monday, shares of the PowerShares Global Agriculture Portfolio ETF ( PAGG) entered into oversold territory, changing hands as low as $29.15 per share. We define oversold territory using the Relative Strength Index, or RSI, which is a technical analysis indicator used to measure momentum on a scale of zero to 100. A stock is considered to be oversold if the RSI reading falls below 30.In the case of PowerShares Global Agriculture Portfolio, the RSI reading has hit 28.6 — by comparison, the RSI reading for the S&P 500 is currently 47.2. A bullish investor could look at PAGG's 28.6 reading as a sign that the recent heavy selling is in the process of exhausting itself, and begin to look for entry point opportunities on the buy side. Looking at a chart of one year performance (below), PAGG's low point in its 52 week range is $27.10 per share, with $31.29 as the 52 week high point — that compares with a last trade of $29.15. PowerShares Global Agriculture Portfolio shares are currently trading down about 0.4% on the day.