2009 Annual Report
Winter wheat was planted in August 2008 and the remaining three crops were planted in spring 2009. Two wheat variety by water trials were also planted, monitored, and harvested in collaboration with CSU Wheat Breeders and ARS-Agricultural Systems Unit. The 2008 bean variety by water trial was repeated in 2009. Plant physiological and stress response measurements were completed as described in the project plan. Energy balance instrumentation was installed in two corn treatments in collaboration with ARS-ASR and CSU.
Neutron probe access tubes were installed in wheat, corn and beans, respectively. Since these tubes were installed in different locations than in 2008, four sites based on soil differences in each of these blocks were used to check the calibration equation for the neutron probe. Bowen ratio/energy balance instrumentation was installed in the wheat ET block in late October 2008 to measure crop ET from shortly after emergence, through dormancy, spring green-up, and the main portion of wheat growth, development, and maturation. Stationary infrared thermometers (IRTs) to continuously measure canopy temperature were installed in four of the six irrigation treatments in two reps of the wheat small plot block to measure differences in canopy temperature related to the irrigation scheme.
Canopy temperature, canopy reflectance, and images were taken in all plots at least weekly from a boom-mounted platform on a high-clearance tractor to monitor crop growth and development as related to the various degrees of plant water stress imposed by the irrigation scheme. Growth stage, plant height, intercepted light for canopy cover estimates, and limited leaf area measurements on corn are in progress for this year’s growing season. These data will be correlated with the remotely sensed data.
Studies to investigate the effect of limited irrigation on weed communities were continued at two sites and new studies were initiated to investigate the effect of limited irrigation on seed production and the pattern of emergence and seed production of selected weed species at one location. Testing of the statistical model for predicting weed distributions from presence-only data was delayed but the testing will be more complete and valid for our use of the model. Soil samples were taken from the corn, dry bean and sunflower blocks to determine the effect of irrigation levels on the movement and dissipation of the herbicides applied to the soil of these crops.
Bausch, W.C., Halvorson, A.D., Cipra, J. 2008. QuickBird Satellite and Ground-based Multispectral Data Correlations with Agronomic Parameters of Irrigated Maize Grown in Small Plots. Biosystems Engineering 101 (2008), pp. 306-315 DOI information: 10.1016/j.biosystemseng.2008.09.011
Wiles, L. 2009. Beyond Patch Spraying: Site-specific Weed Mmanagement With Multiple Herbicides. Precision Agriculture.Publisher Springer Netherlands: ISSN 1385-2256(Print) 1573-1618 (Online); Volume 10, Number 3/June, 2009;pp 277-290
Stephen R. Canner, L. J. Wiles, Robert H. Erskine, Gregory S. McMaster, Gale H. Dunn, and James C. Ascough, II*: Modeling with Limited Data: The Influence of Crop Rotation and Management on Weed Communities and Crop Yield Loss: Weed Science 2009 57:175–186
Nadler-Hassar, T., Shaner, D.L., Nissan, S., Rubin, B., Westra, P. 2009. Are Herbicide Resistant Crops The Answer To Controlling Cascuta?. Pest Management Science. doi 10,1002/PS 1760
Scheneider, S.M., H. A. Ajwa, T. J. Trout, and S. Gao. 2008. Nematode Control Fron Shank-and-Drip-Applied Fumigant alternatives To Methyl Bromide. HortScience. 43(6): 1826-1832.
Gao, S. R. Qin, J. McDonald, B. D. Hanson, and T. J. Trout. 2008. Field tests of surface seals and soil treatments to reduce fumigant emissions from shank-injection of Telone C35. Sci. Total Environ. 405:206-214.
Hanson, B.D.,S. Schneider,J. Gerik,A. Shrestha, T. Trout, S. Gao. 2009. Comparison of Shank-anf-Drip-Applied Methyl Bromide Alternatives in Perenial Crop Field Nurseries. HortTechnology 19:331-339.
Suduan Gao, Ruijun Qin, Bradley D. Hanson, Nishanth Tharayil, Thomas J. Trout, Dong Wang and James Gerik Effects of Manure and Water Applications on 1,3-Dichloropropene and Chloropicrin Emissions in a Field Trial. J. Agric. Food Chem., 2009, 57 (12), pp 5428–5434.
Mazahrih, N., Nedal, K., Evett, S.R., Ayars, J.E., Trout, T.J. 2008. Field calibration accuracy and utility for four down-hole water content sensors. Vadose Zone Journal. 7:992-1000.
McDonald, J.A. S. Gao, R. Qin, B.D. Hanson, T.J. Trout, and D. Wang. 2009. Effect of water seal on reducing 1,3-dichloropropene emissions from different soil textures. Journal of Environmental Quality. 38: 712-718.
Qin, R., S. Gao, D. Wang, B.D. Hanson, T.J. Trout, and H. Ajwa. 2009. Relative effect of soil moisture on emissions and distribution of 1,3-dichloropropene and chloropicrin in soil columns. Atmospheric Environment. 43:2449–2455.
Schneider, S.M., B.D. Hanson, J.S. Gerik, A. Shrestha, T.J. Trout, S. Gao. Comparison of Shank-and-Drip-Applied Methyl Bromide Alternatives in Perennial Crop Field Nurseries. 2009. HortTechnology. 19:331-339.
Shrestha, A., Browne, G.T., Lampinen, B.D., Schneider, S.M., Simon, L., Trout, T.J. 2008. Perennial crop nurseries treated with methyl bromide and alternative fumigants: effects on weed seed viability, weed densities, and time required for hand weeding. Weed Technology. 22:267-274
Bukin, B., Gaines, T., Nissen, S., Westra, P., Shaner, D.L., Sleugh, B.B., Peterson, V.F. 2008. Aminopyralid and Clopyralid Absorption and Translocation Differences in Canada Thistle (Cirsium arvense). Weed Science.
Shaner, D.L., Khosla, R., Brodahl, M.K., Buchleiter, G.W., Farahani, H. 2008. How Well Does Zone Sampling Based On Soil Electrical Conductivity Maps Represent Soil Variability. Agronomy Journal 10/01/2008
Bridges, M., Henry, W.B., Shaner, D.L., Khosla, R., Westra, P., Reich, R. 2008. Spatial variability of atrazine and metolachlor dissipation on dryland no-tillage crop fields in Colorado. Journal of Environmental Quality. 37:1-9.
Hanson, B.D., Fandrich, L., Shaner, D.L., Westra, P., Nissen, S.J. 2007. Recovery Of Imidazolinone-Resistant Hard Red Wheat Lines Following Imazamox Application. Crop Science. Vol.(47):2058-2066
Hunter, W.J., Shaner, D.L. 2009. Soybean Oil Based Biobarriers Remove Atrazine from Contaminated Water: Laboratory Studies. Journal of Contaminant Hydrology. 103-29-37.
Trout, T.J. 2009. Use Of Crop Canopy Size To Estimate Water Requirements Of Vegetable Crops. Natural Resources Research Update (NRRU). Update # 241617