Action Synopsis: Soil Fertility About Actions

Amend the soil with organic processing wastes or their composts

How is the evidence assessed?
  • Effectiveness
  • Certainty
  • Harms

Study locations

Key messages

Two controlled, replicated trials from Spain and the United Kingdom (one also randomized) measured the effect of adding composts to soil. One trial found applying high rates of cotton gin compost and poultry manure improved soil structure and reduced soil loss, but increased nutrient loss. One trial found improved nutrient retention and increased barley Hordeum vulgare yield when molasses were added.

SOIL TYPES COVERED: sandy-clay, sandy loam, silty-clay.


About key messages

Key messages provide a descriptive index to studies we have found that test this intervention.

Studies are not directly comparable or of equal value. When making decisions based on this evidence, you should consider factors such as study size, study design, reported metrics and relevance of the study to your situation, rather than simply counting the number of studies that support a particular interpretation.

Supporting evidence from individual studies

  1. A controlled, randomized, replicated experiment in 2001-2004 on silty- and sandy-clay soils in Seville, Spain (Tejada & Gonzalez, 2008) found that high application rates (7,120 kg/ha/year) of both crushed cotton gin compost and poultry manure reduced soil aggregate instability (see background section) (by 21% and 18%, respectively), soil density (20% and 17%) and soil loss (29% and 25%) compared to the control treatment. Nutrient loss was higher in water from amended soils (19 mg organic carbon/l for cotton compost and 22 mg/l for poultry manure) than the control soil (0 mg/l). Lower application rates of cotton compost and poultry manure also reduced soil instability, soil loss and nutrient loss, but to a lesser extent. There were four replicates of five treatments: untreated soil, cotton compost applied at 3,560 kg organic matter/ha/year, cotton compost at 7,120 kg/ha/yr, poultry manure at 3,560 kg/ha/year, and poultry manure at 7,120 kg/ha/year. Soil samples were collected from each plot to 25 cm depth.

    Study and other actions tested
  2. A replicated, controlled study in 2000 on sandy loam soil in Wellesbourne, United Kingdom (Rahn et al. 2009) found that adding sugar beet Beta vulgaris tops with molasses to a barley Hordeum vulgare crop increased soil mineral nitrogen by 46% and yield by 32%, compared to no addition. Adding paper waste with sugar beet tops did not affect soil mineral nitrogen but improved yield by 23%. Amendments were applied at 3.2-3.8 t/ha, including compactor (machine which compresses waste material to reduce the space it takes up) and paper waste from the recycling industry, recently-harvested wheat Triticum aestivum straw, compost from municipal green waste, and liquid molasses (thick brown, uncrystallized juice from raw sugar) from the sugar refining industry. Amendments were applied with 42 t/ha sugar beet tops.

    Study and other actions tested
Please cite as:

Key, G., Whitfield, M., Dicks, L.V., Sutherland, W.J. & Bardgett, R.D. (2020) Enhancing Soil Fertility. Pages 613-634 in: W.J. Sutherland, L.V. Dicks, S.O. Petrovan & R.K. Smith (eds) What Works in Conservation 2020. Open Book Publishers, Cambridge, UK.


Where has this evidence come from?

List of journals searched by synopsis

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Soil Fertility

This Action forms part of the Action Synopsis:

Soil Fertility
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