Disadvantages of Soil Based Compost

Disadvantages of Soil Based Compost

Disadvantages of Soil Based Compost The John Innes composts had a profound effect on the quality of greenhouse and pot plants and on the success rate of growing them.

However, there are disadvantages with these composts today that were not so apparent in the early years of their use. They are as follows:

  1. There is an increasing difficulty in obtaining turf loam. When it is obtainable it is often of indifferent quality and rather variable, producing results that may be disappointing.
  2. The cost of loam is increasing because of the labour involved, and therefore not only is the compost becoming more expensive, but undesirable short cuts in production are practised.
  3. Because it is based on soil, the compost tends to be heavy to move and its transport is costly.
  4. The composts will not store as they be- come toxic due to the release of ammonia.
  5. There is no source of readily available nitrogen (nitrate), magnesium or trace elements. It is presumed that the loam will provide these but this is not always a valid assumption, especially nowadays.

If a good reliable source of loam can be found, the John Innes composts are satisfactory. They have stood the test of time and do have advantages, among them the gradual release of water and nutrients to the plants. However, for many commercial growers and gardeners the disadvantages outweigh the advantages.

02. April 2011 by Dave Pinkney
Categories: Greenhouse Gardening, Organic Gardening, Soil Cultivation | Tags: , | Comments Off on Disadvantages of Soil Based Compost


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