Even low-phosphorus composts are known to export phosphorus over many years. The use of compost is not recommended in nutrient-sensitive watersheds where phosphorus pollution is a concern. There are a number of alternative sources of soil organic material which have undergone field studies which have benefits and potential concerns:
+
Even low-phosphorus composts are known to export phosphorus over many years. The use of compost is not recommended in nutrient-sensitive watersheds where phosphorus pollution is a concern. There are a number of alternative sources of soil organic matter which have undergone field studies which have benefits and potential concerns:
{|class="wikitable"
{|class="wikitable"
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|Doesn't leach phosphorus||Must be imported
|Doesn't leach phosphorus||Must be imported
|-
|-
−
!Wood chip
+
!Wood chips
|Doesn't leach phosphorus<br>Promotes nitrogen removal from water||
|Doesn't leach phosphorus<br>Promotes nitrogen removal from water||
|-
|-
−
!Peat Moss
+
!Peat moss
|Doesn't leach phosphorus||Must be extracted from natural wetlands
|Doesn't leach phosphorus||Must be extracted from natural wetlands