Table Of Content

Historic, Archive Document Do not assume content reflects current scientific knowledge, policies, or practices. pee a si United States Department of Natural Agriculture Resources Agricultural Research Research Service Center Northern Plains Area “4 co = pe CD Cie temme Gsik c; ase Ces r2m Buv ~O—ND| Lro]?‘ i}4 te Ree 9 ESD VOSh hye ieCreyr cailte w¥i i lds ae e sh J : minal Mm 7992 Report For Additional Information: James R. Welsh, NRRC Director Crops Research Laboratory 1701 Center Avenue Fort Collins, CO 80526 TEL: (303) 498-4227 FAX: (303) 498-4242 TABLE OF CONTENTS ROE OG RAEIA l LOCA TIONG: se aaa Cte ote, el hee oe he ws teery ees OVINER iles cures iat ae hes ey haem ego vege a> Hev eup items * 8 «+ + NATURAL RESOURCES RESEARCH CENTER NS SLON SOL ATEMEN Leaner. Fe rc eyes ens sae NRRC PROGRESS REPORT Jamesteewclshimeat Stier Piety, yes. eee cec toes 4s Srcrure 66 bes CENTRAL PLAINS RESOURCES MANAGEMENT RESEARCH UNIT IVSSI G INS Se ACVL UE Se EE Ree att» ho whe Etats < ss ties 6 ees POPULATION THRESHOLDS FOR JOINTED GOATGRASS AND VOLUNTEER RYE IN WINTER WHEAT R.L. Anderson, D.J. Lyon, G.A. Wicks, S.D. Miller, ANCE MWCSLa ge yee, Seni Selle Be tres PLES ryrer i wens deme se es EFFECT OF CROPPING ROTATIONS AND TILLAGE ON EMERGENCE OF JOINTED GOATGRASS AND DOWNY BROME ReleeAnderson and -D:GeeNielsen verre spc: reece ey eet ee CLOMAZONE (COMMAND) FOR CONTROL OF JOINTED GOATGRASS AND DOWNY BROME IN WINTER WHEAT R:GeAnderson,.€,G; Ross,and,S.D-Millern., 0. -es-u>s. s+s CULTURAL MANAGEMENT SYSTEMS FOR WINTER ANNUAL GRASS CONTROL IN WINTER WHEAT R.L.- Anderson ~ 0082-5. oe ee ee a WEED MANAGEMENT SYSTEMS FOR SUNFLOWER R.L. Anderson, D.L. Tanaka, and D.J. Lyon ............. 29 GROWTH AND INTERFERENCE OF PROSO MILLET IN DRYLAND CORN R.L. Anderson, S.E. Hinkle and A.D. Halvorson ........... 31 PSEUDOMONAS BACTERIA AS A BIOLOGICAL CONTROL AGENT FOR DOWNY BROME IN WINTER WHEAT A. Kennedy, A.J. Ogg, Jr., P. Stahlman, and Re Andersons ih is. vs ee ase oe eee 33 TOLERANCE OF OATS, FOXTAIL MILLET, PROSO MILLET, AND SUNFLOWER TO CLOMAZONE (COMMAND) AND ATRAZINE D.J/ Lyon‘and R:L.*Anderson® \) 2p creer ee 35 METHOD DEVELOPMENT FOR EVALUATION OF C AND P POOLS TO ASSESS SOIL QUALITY Rudy:A? Bowman... i. 5 5.2220 san | «ees ee ee 37 P, C, AND MICRONUTRIENT DYNAMICS UNDER ALTERNATE CROPPING AND TILLAGE SYSTEMS R. A. Bowman, A. D. Halvorson, R. L. Anderson, S. E. Hinkle, D> C2 Nielsen} and M: FE) Vigil a2 xeceee eeee ee 39 P and ZN DYNAMICS IN NO-TILL WHEAT AND CORN R. A. Bowman and*A: DHalvorson™ #272. - 37... 41 COMPARISON OF CRP LAND IN VARIOUS STAGES OF REST WITH WHEAT-FALLOW AND ADJACENT GRASSLAND RAC Bowman "ot %, 66a 2 A OPER Aa eet ae, Ree ee ee 43 MANAGEMENT OF PHOSPHORUS FERTILIZER FOR DRYLAND WINTER WHEAT IN REDUCED TILLAGE SYSTEMS A. D. Halvorson, J. L. Havlin, and R.A. Bowman .......... A4 EFFECT OF NITROGEN FERTILIZATION ON WATER-USE EFFICIENCY BY CROPS GROWN IN AN ANNUAL CROPPING SYSTEM Ardells Dr alvOrsofiies <2. 4. os ee. x ee eee 46 id CROP ROTATION AND NITROGEN FERTILIZATION FOR EFFICIENT WATER USE PATCCHIL). BL alVOrsOD gee o We skeen. uc Yowniees P< fever <teres + ss 48 NITROGEN FERTILITY NEEDS OF CROPS GROWN WITHIN A REDUCED TILLAGE, FLEXIBLE CROPPING SYSTEM Aa ese alvorson and..G. A Reule. .posuen ore o oceuce cme uinews + se 50 EFFECT OF TILLAGE SYSTEM AND CROP ROTATION ON WINTER WHEAT YIELDS A.D. Halvorson, G.A. Peterson, S.E. Hinkle, and M.F. VF aE UR Ms Ns eh ace Sty «00 sce 4 es 52 EVALUATION OF MANAGEMENT PRACTICES FOR CONVERTING CONSERVATION RESERVE PROGRAM (CRP) LAND BACK TO CROPLAND A.D. Halvorson, R.L. Anderson, and S.E. Hinkle .......... 54 EVALUATION OF ALTERNATIVE CROP ROTATIONS TO WINTER WHEAT-FALLOW A.D. Halvorson, R.L. Anderson, S.E. Hinkle, D.C. Nielsen, eA SROm Mane Anda VIG a. sies em te eye sys ges ses we 8 os 56 CROPPED-LEVEL-TERRACES IN PASTURES STYCG r e Rew ELK II C Med Chee wed eel och nck Ooh olen FA Sgteetimnyyne «coe es 59 WHEEL-RIDGE-TERRACE STRIP-CROP FARMING STOUT iae ee eh tL LC ane eg ae we 61 CROP RESIDUE DIFFERENCES WITH TILLAGE SYN VEC VEI TTESC S% ays yS eg yc Bre a 63 DRILLED DWARF-CORN PRODUCTION STUDY S(EVCTER EETINKICN FErreeyal | tee Tice ie eee PS... 65 IRRIGATED SOYBEAN YIELD AND WATER GRADIENT SAUTE, TIN af eae BOOS is 67 IRRIGATED CORN POPULATION-YIELD STUDY Steven E. Hinkle and David C. Nielsen ................. 69 CROP ROTATION AND TILLAGE EFFECTS ON WATER USE, WATER STRESS, AND YIELD OF ALTERNATIVE CROP ROTATIONS FOR THE CENTRAL GREAT PLAINS D.C. Nielsen, A.D. Halvorson, R.L. Anderson, and S.E. Hinkle seg eied ott on base Meech Re en RE te ra ee 71 FIELD EVALUATION OF CORN CROP COEFFICIENTS BASED ON GROWING DEGREE DAYS OR GROWTH STAGE David C. Nielsen and Steven E. Hinkle ................. 75 RIDGE-PLANTING TEMPERATURE EXPERIMENT David C. Nielsen and Steven E. Hinkle ................. fe SUNFLOWER STUBBLE, WIND VELOCITY PROFILES David C. Nielsen and Steven E. Hinkle ................. 719 NITROGEN RESPONSE OF SPRING AND WINTER CANOLA Merle F. Vigil, Ardell Halvorson, and Bill Beard ........... 81 INVESTIGATION OF BASE TEMPERATURE AND PLANTING DEPTHS OF SPRING CANOLA AND SAFFLOWER M.F. Vigil, R.L. Anderson, A.D. Halvorson, and B. Beard..... 83 CARBON AND NITROGEN MINERALIZATION FROM DECOMPOSING CROP RESIDUES IMEP e VIGTL ANOS SmeSCUCDCISe ee. ke 85 AN EVALUATION OF NITRIFICATION INHIBITORS AND PRECISION PLACEMENT OF LARGE UREA PELLETS FOR IRRIGATED CORN M.F. Vigil, J.F. Power, J.S. Schepers, D.D. Francis ANC cA MIOSICDs et ee a ee a ee 87 GREAT PLAINS SYSTEMS RESEARCH UNIT MISSIONS TAP CREMINE G cnet te s oy eee ee are a eee 93 ANALYSIS OF GREAT PLAINS CROPPING SYSTEMS GEV emorr COlesert tee es 8 A Eee ee” eee 95 iv DEVELOPMENT AND TESTING OF MODELS AND DATABASES TO HELP PROVIDE SUSTAINABLE AGRICULTURAL PRODUCTION SYSTEMS MJ Sshatichae are eee ele Gee. SUSTAINABLE AGRICULTURAL PRODUCTION SYSTEMS FOR THE GREAT PLAINS STEZOTYR SAIC MAStC IME tueME Re Meme Ry wee tae sk es ECOLOGY AND MANAGEMENT FOR SUSTAINED RANGELAND PRODUCTION IN THE GREAT PLAINS Pel BH ansOnandeb:b y peak Cb des pode. o caoksudeeceswdemince*s ¢s s THE ROOT ZONE WATER QUALITY MODEL (RZWQM) VALIDATION AND ENHANCEMENTS K.W. Rojas, M.J. Shaffer, J.D. Hanson, C.V. Alonso, R.M. Aiken, G. McMaster, L.R. Ahuja, Q. Ma, ACV EAE CELCLD A i arr ee ekg Sin sss APPLICATION OF THE NLEAP MODEL TO REGIONAL NITRATE LEACHING ALONG THE SOUTH PLATTE RIVER IN EASTERN COLORADO IMM eratlerandte,Wi. WAYNE tes RR aed. ce ene we ws ROOT ZONE WATER AND CHEMICAL TRANSPORT AS ALTERED BY MACROPORES Rpplemm lilt aganic Ke eS OUNSCD eer ee ices ae ear acs 3 es 8s ROOT ZONE WATER AND CHEMICAL TRANSPORT AS AFFECTED BY MANAGEMENT AND ROOT WATER UPTAKE IN ROW CROPS rcrre OUT AmtpatC sete eeA UG ANS coy clc es me cieuse se' 04.e yo pw h6 wee re t es TWO-DIMENSIONAL CHARACTERIZATION OF TRANSPORT IN VARIABLY-SATURATED SOILS C.V. Alonso, J.G. Benjamin, F.C. Lai and H.D. Rector...... QUANTIFYING CROP RESIDUE ARCHITECTURE AND REGULATION OF HEAT AND VAPOR FLUX GAY Alonso. and. RovMwA ikeng Oo 6. Sith occa cute emcees eee © she SEDIMENT INTRUSION AND DISSOLVED OXYGEN TRANSPORT IN THE SFSR SPAWNING AREAS GAY MAIOOSOIANG RAN. HAVIS 2 0 oe ss ls a ss wee a 6 0s aie a eels OPUS MODEL COMPLETION AND APPLICATIONS VAP Perreita tt. fe letsts 540 ree et eee ee, ae ee 119 Ni ARCITCII As 6 oe 2b lak 4 ict witciaccdl > dehh-6 aa a ee ee 121 CHARACTERIZING MANAGEMENT - TEMPORAL AND SPATIAL VARIABILITY IN SOIL HYDROLOGIC PROPERTIES OF FIELD SOILS G. Dunn, L.R. Ahuja, R.D. Williams, and D.J. Timlin ...... i273 PREDICTION OF LONG-TERM CHANGES IN CARBON STORAGE AND PRODUCTIVITY OF U.S. SOILS AS AFFECTED BY CHANGES IN CLIMATE AND MANAGEMENT JE SHansomandsh- ts.b akcta aet-eete.. 6c ae ee cass ee ae ee 126 DEVELOPMENT OF A COMPREHENSIVE MODEL FOR SOIL GAS FLUX AND REACTION Niele Shattereand esb em eca0 ia eee ed so ene ore 129 RANGELAND RESOURCES RESEARCH UNIT MISSIONES PATEMEN Tilste. fret isc ins eels aon ara a ee ee 137 LEGUMES FOR RANGELANDS: DROUGHT RESISTANCE IN DRYLAND ALFALFA SPAS MOrpatitee + ek. tks ger. SEE. RAE, ces seca 139 RESPONSES OF RANGELAND GRASSES TO CO, AND TEMPERATURE DAT MOl oat ee gee eee es gery sc ea eee a oe 141 ALFALFA INVESTIGATIONS CTE SLOW USCOC rm gn 143 PHYSIOLOGY AND GENETICS OF ISOFLAVONOID ACCUMULATION IN CICER MILKVETCH Andrew W. Lenssen, Charley E. Townsend, and Susans WIVatiNaers ee eee eS cas Ws gind s adc AE 144 Vi