Hero Gollany USDA-ARS Pendleton, OR NUE Conference - August 8-10, 2016.

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Presentation transcript:

Hero Gollany USDA-ARS Pendleton, OR NUE Conference - August 8-10, 2016

Introduction This system reduces soil fertility through loss of soil organic matter (SOM), while increasing erosion and CO 2 emissions. Conventional intensive tillage with residue removal are the predominant practices in dryland winter wheat-summer fallow systems. Nitrogen (N) and water are major limiting factors for crop yields in dryland cropping systems.

Synchronize N supply from decomposition of SOM with N demand by the crop to optimize yield and reduce N fertilizer use and fossil-fuel energy input. N demand N supply

Objective Quantify the impact of an alternative management (inclusion of pea) in winter wheat-fallow under no-till(NT ) on N use efficiency, grain yield & quality, and CO 2, N 2 O, NH 3, and CH 4 emissions. Denitrification Ammonium NO 3 Nitrification NH 3 NH 4 + N2N2 N2ON2O Leachi ng

Experiment Design Two LTEs will be evaluated: NT A plots established in 1982 NT B plots established in 1997, changed to wheat-pea in The experimental design is randomized split block with four replications and five N treatments (0, 40, 80, 120, 160 lb N/acre). 15 N micro plots (1 m 2 ).

Procedure Harvest Index grain yield grain + straw yield HI = Quantify harvest index, N uptake, and N use efficiency in conventional and intensified wheat production systems under several N fertilizer rates. Field data needed: Grain and straw yield N concentration of grain and straw

N Use Efficiency Parameters Grain N yield = grain N × grain yield Straw N yield = straw N × straw yield Biomass N yield (BNY) = Grain N yield + Straw N yield N harvest index = Grain N yield / BNY Applied N recovery fraction = BNY at given N rate – BNY at zero N rate Applied fertilizer N

Procedure (cont.) Monitor and quantify CO 2, N 2 O, and CH 4 and NH 3 in relation to fertilizer rate and replacement of fallow with pea in the cropping system. Monitor and quantify soil profile N concentrations and determine leaching below the root zone. Incremental soil sampling- 6 ft NO3-N leaching

Expected Outcomes and Anticipated Impacts Recommendations will be shared with producers, NRCS personnel, and researchers to provide guidance for best management of Inland PNW soils & environmental quality. Best management practices for: N use efficiency; reducing N leaching and N 2 O, NH 3 and CO 2 emissions; and nutrient cycling.

Expected Outcomes and Anticipated Impacts Results will be disseminated via: onsite demonstrations, factsheets, extension publications (Conservation Tillage Update article), scientific journals, and the world wide web.

Thank you ?