Application of a biological substrate mixture composed by microorganisms and rock phosphates to two lettuce cultivars (Lactuca sativa L.). Cookies on CAB Direct Like most websites we use cookies. This is to ensure that we give you the best experience possible. Continuing to use www.cabdirect.org means you agree to our use of cookies. If you would like to, you can learn more about the cookies we use. Close Find out more Home Other CABI sites CABI.org Plantwise Knowledge Bank Invasive species About Help Mobile Instant Access Login