Overall, the organic system produced less, relative to the conventional system in interaction with year
effect. Yield reduction seemed related to the lower soil nutrient availability of organic fertilisers that
provided nutrients consequent to mineralisation. Therefore, summer crops are well-suited to manurefertilised
organic farms as mineralisation happens at higher temperatures, as opposed to winter wheat,
which is largely reduced in such systems. Commercial organic fertilisers can, however, limit this effect
through their high nutrient availability in the winter and early spring