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===Organic component alternatives===

===Organic component alternatives===

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, or an [[Additives| additive]] to enhance nutrient retention of the media should also be included. There are a number of alternative sources of soil organic matter 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, or an [[Additives| additive]] to enhance nutrient retention of the media should also be included (see below). There are a number of alternative sources of soil organic matter which have undergone field studies which have benefits and potential concerns:

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