Nitrogen use efficiency and residual effect of fertilizers with nitrification inhibitors |
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| Institution: | 1. Queensland University of Technology, Institute for Future Environments, Brisbane, Queensland, Australia;2. School of Mathematical Sciences, Queensland University of Technology, Brisbane, Queensland, Australia;1. Agroforestry Department, E.T.S.I. ‘La Rabida’, Huelva University, Palos de la Frontera, 21819 Huelva, Spain;2. Department of Organisms and System Biology, Polytechnic School of Mieres, Oviedo University, Mieres, 33600 Asturias, Spain;3. COMPO EXPERT Spain S.L. C/Joan d’Austria, 39-47, 08005 Barcelona, Spain;1. Agri-Food and Biosciences Institute, Newforge Lane, Belfast BT9 5PX, Northern Ireland, UK;2. School of Biology and Ecosystem Science, Earth Institute, University College Dublin, Belfield, Ireland;3. Department of Plant Ecology, Justus-Liebig University Giessen, Heinrich-Buff-Ring 26, 35392 Giessen, Germany;4. School of Environment, Natural Resources and Geography, Bangor University, Bangor LL57 2UW, UK;1. Agricultural Research School, Nuclear Science and Technology Research Institute, Karaj 31465-1498 (Iran);2. Institute of Ecology and Earth Sciences, University of Tartu, Tartu 51014 (Estonia);3. Higher Technical School of Engineering (ESTI), Technical University of Madrid, Madrid 28040 (Spain);4. Soil and Water Management & Crop Nutrition, Joint Food and Agriculture Organization of the United Nations (FAO)/International Atomic Energy Agency (IAEA) Division of Nuclear Techniques in Food & Agriculture, Vienna A-1400 (Austria);5. Wondo Genet College of Forestry and Natural Resources, Hawassa University, P.O. Box 128, Shashemene (Ethiopia);6. Department of Plant Ecology, University Giessen, Heinrich-Buff-Ring 26, Giessen D-35392 (Germany);7. School of Biology and Environmental Science, University College Dublin, Belfield D04 V1W8 (Ireland);8. Faculty of Agriculture and Natural Resources, University of Gorgan, Gorgan 3158777871 (Iran);9. Department of Agronomy and Plant Breeding, College of Agriculture and Natural Resources, University of Tehran, Karaj 1417466191 (Iran);10. Department of Soil and Environmental Sciences, Agricultural University Peshawar, Peshawar 25130 (Pakistan);11. Center of Environmental Contamination Investigation, University of Costa Rica, Mountains of Oca 1150 (Costa Rica);1. Institute for Future Environments, Queensland University of Technology, Brisbane, QLD 4000, Australia;2. Department of Agriculture, Fisheries and Forestry, Kingaroy Research Station, Kingaroy, QLD 4610, Australia;3. School of Mathematical Sciences, Queensland University of Technology, Brisbane, QLD 4000, Australia;1. Embrapa Agrobiology, Rod. BR 465, km 7, CEP 23891-000, Seropédica, RJ, Brazil;2. Federal Rural University of Rio de Janeiro (UFRRJ), Rod. BR 465, km 7, Seropédica, RJ, Brazil;3. Soil and Water Management & Crop Nutrition, Joint FAO/IAEA Division of Nuclear Techniques in Food & Agriculture, P.O. Box 100, A-1400 Vienna, Austria |
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| Abstract: | Blending fertilizers with nitrification inhibitors (NI) is a technology to reduce nitrogen (N) losses. The application of NI could increase the soil N supply capacity over time and contribute to an enhancement of N use efficiency (NUE) in some cropping systems. The objectives were to determine in a field experiment located in Central Spain (i) the effect of NI-fertilizers applied to maize (Zea mays L.) during two seasons on yield, N content and NUE compared to conventional fertilizers, (ii) the soil residual effect of NI-fertilizers in a non-fertilized sunflower (Helianthus annuus L.) planted during a third season, and (iii) the possible sources of residual N via laboratory determinations. The maize was fertilized with ammonium sulfate nitrate (ASN) and DMPP (3,4-dimethylpyrazole phosphate) blended ASN (ENTEC®) at two levels (130 and 170 kg N ha?1). A control treatment with no added N fertilizer was included to calculate NUE. The second year, DMPP application allowed a 23% reduction of the fertilizer rate without decreasing crop yield or grain quality. In addition, the sunflower planted after the maize scavenged more N in treatments previously treated with ENTEC® than with traditional fertilizers, increasing NUE in the cropping systems. After DMPP application, N was conserved in non-ready soil available forms during at least one year and subsequently released to meet the sunflower crop demand. The potential N mineralization obtained from aerobic incubation under controlled conditions of soil samples collected before sunflower sowing was higher for ENTEC® than ASN or control treatments. A higher δ15N in the soil indicated larger non-exchangeable NH4+ fixation in soils from the plots treated with ENTEC® or ASN-170 than from the ASN-130 or the control. These results open the opportunity to increase NUE by designing crop rotations able to profit from the effect of NI on the soil residual N. |
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| Keywords: | Ammonium sulfate nitrate DMPP Fertilizer use efficiency Nitrogen recovery |
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