VARIATION IN QUALITY OF COMPOSTED GREEN WASTES OF UK ORIGIN AND THEIR SUITABILITY FOR INCLUSION IN GROWING MEDIA
Great variation in physical and chemical characteristics was evident in a comprehensive survey of composted green wastes from the UK. Variations in bulk density, organic matter and plant nutrients, notably nitrate were seen. The levels of nitrate in the samples varied considerably from 469 mg/L (± 2.7 mg/L) to negligible amounts in other samples. From fifteen samples surveyed four were chosen as candidates for inclusion in growing media. The germination and growth of tomatoes and lettuce was linked to the physical and chemical characteristics of peat media amended with composted green waste. In some, poor plant growth was evident at concentrations of composted green waste as low as 20%: in others seedling growth was acceptable at concentrations of composted green waste as high as 70%. Clearly the adoption of good practice, for example 'The Composting Industry Code of Practise' by producers of composted green waste advocated by The Composting Association, would enhance the use of this material by manufacturers of growing media.
Surrage, V.A. and Carlile, W.R. (2008). VARIATION IN QUALITY OF COMPOSTED GREEN WASTES OF UK ORIGIN AND THEIR SUITABILITY FOR INCLUSION IN GROWING MEDIA. Acta Hortic. 779, 631-636
peat alternative, growth trials, physical and chemical characteristics, good practice