herbicid strategy reduc nutgrass cyper rotund l dens cotton gossyp hirsut introduc spp ident charl 1991 second import weed aust produc infest 79 new sou wal property 15 are 21 000 ha weed problem prim attribut report field dens 20004000 tubersm2 correspond reduc lint yield 92 1995 grow tradit attempt control msma interrow cult incrop infallow strategy rel ineffect control rep apply glyphos gav effect suggest apply ear season follow mid lat occ interv long 4 week tub produc shoot emerg haus 1962 ind includ norflurazon enh suppress research success rang altern herbicid 1963 control amitrol eptc 24d not asynchron tub difficult erad holt al chernicky watkin 1992 shortterm phytotox johnson 1975 observ good bentazon perfluidon grich imazethapyr anderson dunford 1969 limit bensulid w k vencil per com degr methazol fomesaf lactof fluometuron diuron best gen com combin keeley 1973 cost appleby 1976 obrigawitch 1980 c esculent prometryn atrazin metolachl halosulfuronmethyl new evalu reg austral act somervail enco glyphosatetrimes combin ethephon study expery test develop propos tre assess develop mat method detail sit expery 1 overlay wilon war 31 48s 147 59e alluv soil ph 67 5 wat surfac 74 07 m mckenzy 2 norwood mor 291 26s 149 47e grey crack clay 73 tre alloc random design start av heavy infest light plot bas vis estim autumn resid halfl 180 day humburg 19891 overlay prevy tre 3 posit farm hist 6 palom prem 55e 001 mol cac random complet block design apply sampl situ commerc flood irrig field irrig sched neutron prob insect press twic week insecticid necess bed maintain minim disturb trifluralin 12 aih 05 26 august 18 1993 09 band hil sow nitrog anhydr ammon 118 nha july 104 waterrun ure 50 decemb cv cs plant 13 kgha sical vi 16 14 jun 03 7 octob trifiuralin 11 ailh 27 pendimethalin 04 april 160 250 respect 189 siokr l23 10 an spring cor plot tak top cent row 70 mm diamet 150 deep count wash 20 long row wid handheld boom wid del 100 lha 200 kpa nozzl prepl incorp dep lilliston rol fing cult direct nozzl spray novemb tractormount curtain spray agr 60 non surfact sulfometuron 02 025 volum harvest cent pick singl pick seed record subsampl process gin assess gin perc comparison seventeen tabl block 9 reply 28 23 1994 viabl glassh subsampl plac sandp moss pot mix seedl tray 35 120 sev reply high low init impact eff comp preemerg 199293 postemerg compr addit 199394 reduc afallow pop fallow ad paddock graz sown oat numb occas month regul cult est 1988 continu sit graz period twelv 2m 19 septemb 1989 1990 30 25 stat analys dat analys poisson model genst two dimend trend remov column effect cor weight log offset pry cov analys convert standard er freedom contrast spec comparison reml maxim er diff mean sed sign level rainfal season 350 262 fig unt ros 278 increas 1903 4389 7194 contrast benfures fel 1931 repres 96 drop highest 1488 consist janu reduc postharvest did consist v comp larg decreas 8 addit perc av 418 417 effect show 63 improv increas 317 315 2way interact term 556 311 2250 367 year init low remain diff particul tim 815 1029 lowest 87 86 aboveav yield receiv extr gre reduc 441 few av declin 1342 310 fin 95 91 84 89 80 sign overal 378 582 47 dimethenamid suifometuron affect 374 06 434 low 438 tot 1989july fig progress est discuss examin level multipl success support find zandstr 1974 dol piedrahit 1982 observ kil veget shoot quick emerg again attach consequ expos receiv subleth dos poss inadequ transloc incomplet chas 1979 account 5fold comp unstress plant humid moisturestress 1985 decreas plant age anecdot evid ind giyphos cold stress young opportun apply result longterm pop achiev glyphosatebas program irrig advers weath condit demand mak apply optim delay prev canop clos allow grow uncheck remaind tim overcom improv combin benefit fact contribut app inconsist act moist declin ev irregul bas wet cov dry belowav fig addit crop ful insufficy lik cas wet ful expery consecut improv prevy norflurazont ad report support cont react cam suspend mix excel outstand undergo evalu reg drop develop simil halosulfuron supery 4tre saf remain opt crop system imazapyr rat situ high 1015 act asa steril giv bet elimin isol patch cle pract poor 1417 rat 0056 0038 46 effect rainf larg sery sum largest influ 4454 657 strong neg rel end app third plant result pronount declin high p0001 lack respons explain competit prob light infest occur 1123 tubersim2 vigo grow rapid nor temp warm 130c 290c day minim octob tal rapid shad conclud us remain and reduc difficul crop sensit encount presow act grow ear saf narrow window consist combin id