University of Maryland Extension

P Risk Assessments for High Tunnels

Q. Is it necessary to do a P risk assessment (PSI/PMT) for crops grown in high tunnels? The soil test FIV-P is >150 and the crops are planted in the soil; however, the high tunnel sheds the rain which eliminates potential for erosion and runoff. (Posted 11-11, revised 10-16)

A. Due to the controlled nature of management operations, no, it is not necessary to perform  P risk assessments (PSI/PMT) for crops grown in high tunnels as long as the high tunnel is in place 365 days a year. But, a PSI must be done if the high tunnel is not in place 100 percent of the year. (Renato Cuizon and Bryan Harris, MDA)

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