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Nutrient loading can be high in dairy-farm soils that are regularly irrigated with shed effluent, especially when the area treated is small or the farming system has intensified. Negative effects on animal health and the environment can occur as a consequence. In 2007, a 3 year project commenced to explore opportunities to mitigate these impacts through the strategic use of maize. Nine on-farm trials have shown that nitrogen (N) fertiliser is not necessary to maximise maize silage yield for first year crops planted in nutrient-rich, effluent treated soils. An additional two trials indicated that this N reserve can also meet all or most of the crop N demand in second year crops. This approach allowed fertiliser costs to be eliminated or minimised. It also reduced residual soil mineral N levels at harvest. Further work is required to give farmers certainty as to when extra fertiliser is required, particularly in the second year.

Growing maize silage in dairy effluent paddocks for two consecutive seasons - effect on crop yield and soil nitrogen