Environmental influences on optimum nitrogen fertiliser rates for temperate dairy pastures

• Published in: European journal of agronomy Vol. 45; pp. 132 - 141
• Main Authors: Pembleton, Keith G., Rawnsley, Richard P., Burkitt, Lucy L.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.02.2013; Elsevier
• Subjects: Agronomy. Soil science and plant productions; Animal productions; Australia; Biological and medical sciences; Fundamental and applied biological sciences. Psychology; General agronomy. Plant production; Generalities. Analysis and diagnosis methods; Inorganic nitrogen fertilisers; Nitrogen response; Nitrogen, phosphorus, potassium fertilizations; Soil nitrogen testing; Soil-plant relationships. Soil fertility. Fertilization. Amendments; Tasmania; Temperate pastures; Terrestrial animal productions; Vertebrates; Australia; Tasmania; Oceania; Inorganic nitrogen fertilisers; CI; Tasmania; DM; Temperate pastures; K; N; P; Soil nitrogen testing; CV; S; ANOVA; Nitrogen response; Australia; Farming animal; Dairy cattle; Inorganic fertilizer; Milk production; Soils; Vertebrata; Mammalia; Inorganic nitrogen; Pasture; Environmental effect; Artiodactyla; Nitrogen fertilizer; Ungulata
• ISSN: 1161-0301; 1873-7331
• DOI: 10.1016/j.eja.2012.09.006

► Moisture had an overarching effect on pasture response to N application rates. ► Between 60 and 81kgN/ha of available N was required to optimise pasture growth. ► Soil N testing may help inform N fertiliser rate decisions for pastures. Considerable variability in the yield response of temperate dairy pastures to the strategic use of nitrogen (N) fertiliser has been observed previously. Some of this variation could potentially be attributed to environmental effects on the available N (soil mineral N plus fertiliser N) concentration required to optimise pasture growth. Five nitrogen application rate response field experiments were undertaken in an attempt to elucidate the environmental influence on pasture mineral N requirements. A significant response to N fertiliser application rate was detected in four out of the five experiments. The absence of a significant response in one experiment can be attributed to limited water availability. Across the experiments where a significant response to N fertiliser rate was detected the available N that was required to achieve 90% of maximum yield ranged between 60 and 81kgN/ha. It is concluded that when water availability, soil temperatures and air temperatures are conducive to pasture growth an available N level of between 60 and 81kgN/ha should be targeted when N fertiliser is used strategically to optimise pasture growth. Soil N testing results should be interpreted in light of the prevailing climatic and edaphic conditions if they are to be used to guide N fertiliser rate decisions within intensively managed temperate pastures.