<p>Even low-phosphorous composts are known to export phosphorous over many years. The use of compost is not recommended in watersheds for which phosphorous pollution is a concern. There are three alternatives which have undergone field study, each of which has a number of benefits and potential concerns: | <p>Even low-phosphorous composts are known to export phosphorous over many years. The use of compost is not recommended in watersheds for which phosphorous pollution is a concern. There are three alternatives which have undergone field study, each of which has a number of benefits and potential concerns: |