Potash shares have declined some 25% from the March highs and are down another 2% to $96 this morning but one strategist seems to think that more downside may be ahead as notable trade $75/$90 put spread traded 7,500x at $3.18 net debit in what lloks like an opening purchase. Potash, along with rest of the commodity based sectors, has come under pressure on concerns about slow global (read China) growth.