Publications

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Publications Found: 29

Fine-Resolution Mapping Of Soil Organic Carbon Based On Multivariate Secondary Data
Simbahan, G. C., Dobermann, A., Goovaerts, P., Ping, J., Haddix, M. L.

Our objective was to quantify the improvement in fine-resolution maps of soil organic carbon stock (CS, Mg C ha− 1) resulting from utilizing multivariate sources of secondary information. Different geostatistical techniques for mapping CS in the top 0.3 m of …


Journal: Geoderma, Volume 132 (3-4): 471-489 (2006), ISBN . DOI: 10.1016/j.geoderma.2005.07.001 Sites: US-Ne1, US-Ne2, US-Ne3

A Multi-Site Analysis Of Random Error In Tower-Based Measurements Of Carbon And Energy Fluxes
Richardson, A. D., Hollinger, D. Y., Burba, G. G., Davis, K. J., Flanagan, L. B., Katul, G. G., William Munger, J., Ricciuto, D. M., Stoy, P. C., Suyker, A. E., Verma, S. B., Wofsy, S. C.

Measured surface-atmosphere fluxes of energy (sensible heat, H, and latent heat, LE) and CO2 (FCO2) represent the “true” flux plus or minus potential random and systematic measurement errors. Here, we use data from seven sites in the AmeriFlux network, including five forested sites …


Journal: Agricultural And Forest Meteorology, Volume 136 (1-2): 1-18 (2006), ISBN . DOI: 10.1016/j.agrformet.2006.01.007 Sites: CA-Let, US-Dk3, US-Ho1, US-Ne1, US-Ne2, US-Ne3, US-PFa

Assessing Bias In Evapotranspiration And Soil Moisture Estimates Due To The Use Of Modeled Solar Radiation And Dew Point Temperature Data
Mahmood, R., Hubbard, K. G.

Solar radiation and dew point temperature are important input variables for many crop growth ecological, hydrological, and meteorological models. It is also well known that solar radiation and dew point temperature (and relative humidity) data are not readily available for …


Journal: Agricultural And Forest Meteorology, Volume 130 (1-2): 71-84 (2005), ISBN . DOI: 10.1016/j.agrformet.2005.02.004 Sites: US-Ne1, US-Ne2, US-Ne3

Nitrous Oxide Emission From No-Till Irrigated Corn
Ginting, D., Eghball, B.

Field experiments were conducted to determine optimal time during the day for N2O flux determination and to evaluate the effects of wheel traffic and soil parameters on N2O fluxes following urea ammonium nitrate (UAN) injection and summer UAN fertigations. The experiments were located on silty clay loam soils …


Journal: Soil Science Society Of America Journal, Volume 69 (3): 915-925 (2005), ISBN . DOI: 10.2136/sssaj2004.0292 Sites: US-Ne1, US-Ne2, US-Ne3

Processing Of Yield Map Data
Ping, J. L., Dobermann, A.

Yield maps reflect systematic and random sources of yield variation as well as numerous errors caused by the harvest and mapping procedures used. A general framework for processing of multi-year yield map data was developed. Steps included (1) raw data screening, …


Journal: Precision Agriculture, Volume 6 (2): 193-212 (2005), ISBN . DOI: 10.1007/s11119-005-1035-2 Sites: US-Ne1, US-Ne2, US-Ne3

Soil Surface Fluxes Of Greenhouse Gases In An Irrigated Maize-Based Agroecosystem
Amos, B., Arkebauer, T. J., Doran, J. W.

An understanding of the effect of fertility management on soil surface fluxes of CO2, N2O, and CH4 is essential in evaluating C sequestration measures that attempt to increase the amount of crop residue returned to the soil through increased fertilizer inputs. In this study, soil surface CO2


Journal: Soil Science Society Of America Journal, Volume 69 (2): 387-395 (2005), ISBN . DOI: 10.2136/sssaj2005.0387 Sites: US-Ne1, US-Ne2, US-Ne3

Gross Primary Production And Ecosystem Respiration Of Irrigated Maize And Irrigated Soybean During A Growing Season
Suyker, A. E., Verma, S. B., Burba, G. G., Arkebauer, T. J.

Using eddy covariance flux measurements, gross primary production (GPP) and ecosystem respiration (Re) of irrigated maize and soybean fields were quantified and examined in terms of relevant controlling variables. Even though the peak green leaf area index (GLAI) of the maize and soybean canopies was comparable …


Journal: Agricultural And Forest Meteorology, Volume 131 (3-4): 180-190 (2005), ISBN . DOI: 10.1016/j.agrformet.2005.05.007 Sites: US-Ne1, US-Ne2, US-Ne3

Annual Carbon Dioxide Exchange In Irrigated And Rainfed Maize-Based Agroecosystems
Verma, S. B., Dobermann, A., Cassman, K. G., Walters, D. T., Knops, J. M., Arkebauer, T. J., Suyker, A. E., Burba, G. G., Amos, B., Yang, H., Ginting, D., Hubbard, K. G., Gitelson, A. A., Walter-Shea, E. A.

Carbon dioxide exchange was quantified in maize–soybean agroecosystems employing year-round tower eddy covariance flux systems and measurements of soil C stocks, CO2fluxes from the soil surface, plant biomass, and litter decomposition. Measurements were made in three cropping systems: (a) irrigated continuous maize, …


Journal: Agricultural And Forest Meteorology, Volume 131 (1-2): 77-96 (2005), ISBN . DOI: 10.1016/j.agrformet.2005.05.003 Sites: US-Ne1, US-Ne2, US-Ne3

Growing Season Carbon Dioxide Exchange In Irrigated And Rainfed Maize
Suyker, A., Verma, S., Burba, G., Arkebauer, T., Walters, D., Hubbard, K.

Net ecosystem CO2 exchange (NEE) was measured in maize-based agroecosystems in eastern Nebraska, USA, during the growing season in 2001. The objective of this study was to quantify and contrast NEE in irrigated and rainfed maize (Zea maize L.) fields. …


Journal: Agricultural And Forest Meteorology, Volume 124 (1-2): 1-13 (2004), ISBN . DOI: 10.1016/j.agrformet.2004.01.011 Sites: US-Ne1, US-Ne2, US-Ne3

Screening Yield Monitor Data Improves Grain Yield Maps
Simbahan, G. C., Dobermann, A., Ping, J. L.

Yield monitor data contain systematic and random errors, which must be removed for creating accurate yield maps. A general procedure for assessing yield data cleaning methods was applied to a new postprocessing algorithm in which six common types of erroneous yield monitor values were removed: (1) combine header status up; (2) start-/end-pass …


Journal: Agronomy Journal, Volume 96 (4): 1091-1102 (2004), ISBN . DOI: 10.2134/agronj2004.1091 Sites: US-Ne1, US-Ne2, US-Ne3