caa a22 4500 463209230 CHVBK 20180405153135.0 cr unu---uuuuu 170326e20071101xx s 000 0 eng 10.1007/s10705-007-9115-5 doi (NATIONALLICENCE)springer-10.1007/s10705-007-9115-5 Nitrate leaching losses and pasture yields as affected by different rates of animal urine nitrogen returns and application of a nitrification inhibitor—a lysimeter study [Elektronische Daten] [Hong Di, Keith Cameron] Nitrate (NO 3 − ) leaching and water contamination is a major environmental issue around the globe. In grazed grassland, most of the nitrate leaching occurs under the animal urine patch areas because of high nitrogen (N) loading rates. The aim of this study was to determine NO 3 - -N leaching losses and pasture responses as affected by different animal urine-N loading rates and application of a nitrification inhibitor, dicyandiamide (DCD). Undisturbed monolith lysimeters (50cm diameter by 70cm deep) of a free-draining stony soil (Pallic orthic brown soil; Udic Haplustept loamy skeletal) with a mixture of perennial ryegrass (Lolium perenne) and white clover (Trifolium repens) were used for the study. Results showed that total NO 3 - -N leaching losses increased significantly (P<0.01) from 22.8 to 59.7, 188.1 and 254.9kg NO 3 − -N ha−1, when urine N was applied at 0 (Control), 300, 700 and 1,000kgNha−1, respectively, without DCD. The application of DCD to the corresponding treatments significantly (P<0.01) reduced the total NO 3 − -N leaching losses to 12.4, 9.9, 75.3 and 139.0kgNha−1, respectively, resulting in an average reduction of 63%. Pasture yield increased linearly with increasing urine-N application rates and the application of DCD resulted in an average 25% increase in pasture dry matter production. The average N offtake was increased by 32% with the application of DCD, confirming the effectiveness of the inhibitor in improving the N cycle. These results indicate that the DCD nitrification inhibitor technology has the potential to be a valuable nitrogen management tool in different grazed pasture systems (e.g. sheep, beef cattle and dairy cattle) to mitigate NO 3 − leaching and improve sustainable production. Springer Science+Business Media B.V., 2007 Grassland nationallicence Nitrate leaching nationallicence Nitrification inhibitors nationallicence Urine returns nationallicence Di Hong Centre for Soil and Environmental Quality, Lincoln University, PO Box 84, Canterbury, New Zealand aut Cameron Keith Centre for Soil and Environmental Quality, Lincoln University, PO Box 84, Canterbury, New Zealand aut Nutrient Cycling in Agroecosystems Springer Netherlands 79/3(2007-11-01), 281-290 1385-1314 79:3<281 2007 79 10705 https://doi.org/10.1007/s10705-007-9115-5 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10705-007-9115-5 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Di Hong Centre for Soil and Environmental Quality, Lincoln University, PO Box 84, Canterbury, New Zealand aut NATIONALLICENCE 700 1- Cameron Keith Centre for Soil and Environmental Quality, Lincoln University, PO Box 84, Canterbury, New Zealand aut NATIONALLICENCE 773 0- Nutrient Cycling in Agroecosystems Springer Netherlands 79/3(2007-11-01), 281-290 1385-1314 79:3<281 2007 79 10705 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer