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Vol. 16—1962 - NorthEastern Weed Science Society

Vol. 16—1962 - NorthEastern Weed Science Society

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182<br />

Beoause o£ spaoe Um1t8~lons in this ,eper,signifioanoe<br />

arrays derived £rom Duncan f s Multiple Range Test are not given tOI'<br />

annual weed contr01. Annual grass pontl'ol,. hc*ever ,was estimated<br />

by number ot plants survivirig tl'eatment in quadrats, 6 inohes wide<br />

and 25 £eet long. For stat~Jtioal analysis, number of plant. pe:r<br />

quadrat were converted to\{i + .0; • For statistioal analys18, pe~<br />

oent annual broadleat wee~ contl'ol was oonverted to angles.<br />

Signif1oanoe was determined at the 5% level.<br />

Results<br />

",' ,"<br />

In both blocks, y1eld was related more '~l.Q•• lyto broadle,ill'<br />

weed oontrol than to annual .ar~8S oontrol: thehighe.r the pe.rc;4Itit<br />

b.roa'dleaf weec:!,oont.rol, the.l1I1gber they1eld. ~1eldwasnot olosely<br />

related to annual g.rass contriol beoause o£ 10K ~otentialstand:r<br />

compared to the .relativel y high potential stand ot annual b.roadlear<br />

weeds: oheok plots ave.raged 2.6 annual g.ras8 plants pel'<br />

squar-e foot in Blook I and 2.8 pe.r squal'e toot in Blook II, oompared<br />

to 30.5 annual b.roadleaf weeds in Blook I and 15.7 per square toot<br />

in Block II.<br />

Although a oomparison between plantins, appl1cationand en:uwgenoe<br />

appl1cationwa8 not intended tn. the exper1.Da.... Ldesign of thee.<br />

blocks, in Block I all emergence treatmentsoutylelded 'planting<br />

treatments, 'Pable2. The hi.gh8.ryield toll:Qtdrngeme.rgenoe tl'eitmente<br />

is related t.o .peroent b.roadleat weedccmtl"olt all emer.8ert,oe<br />

treatments gave highe.r peroent control than all planting treabm~t8.<br />

Beoause all combinatiOns o£ herbicides were not app11ed at botp<br />

plant1ng .and eme.rgenoe, 1t is not poss1ble t:C1oonolusivelY asoel'tain<br />

whether the cl1tfel'ences in weed control resulted £.rom oharactel':h- .<br />

tics o£ the herbicides or resulted £.rom d1tt.:renoes 1nrain£al1'<br />

£ollowing applioat1on: 3.29ino,bes of rdn .t_llduring the firsti<br />

four 'days after the planting application, O.S() inChes tell dUI'1b$<br />

the first tour days atte.r the emergence appl1paUon. Detil t:rOIll'!<br />

Block II, howeve.r, indioate that part of the ditte.rence, at lea~t,<br />

was due to rainfa.11. The planting appl10atiCllI .1nBlook II wel"i<br />

made 29 May,. 19.611 Sf.ter the. he.av y. 1.'8.inS .. fOl.lL.'.O. wing B.100k· I aP.<br />

tions. p110a-.<br />

In Block J:t:wnere coMparisons betweencplanttng and emei'genoe<br />

appl10at ion otthe. same herb1ci"e can be mad.. , ,incont.rut toSlook .<br />

I, nelthel' yleld no~percent. bro.dleaf weed dentrol i •• ssoolabed<br />

withtirile of appl;1ce'Uon. T.1l:1S ... oonclusicn _PJlUes torylelds 'bO-.'<br />

6 and 9 pounds ~i~gal'e 5778, ;Land·,4pounds.Q! Atl'ametl"yne, aria4<br />

pounds P.rometryne, . and tor percent bl"oadleat weed oontrol,<br />

to 3, 6, and 9 pounds o£ Niega.ra 5778, 2 and 4.»Qunds of At.rametDJDe,<br />

and 4 pounds ot P.rometryne.<br />

, . ',.,' .'.;; t '.<br />

No single herbicIde o.r oombination ot h~191de. in eithe,r" '<br />

Block I or Blook II gave signif10antly h1gber"potato "ields 01." give<br />

signitioantly highe.r b.roadleat weed control than the standard<br />

treatment ot 4.5 pounds DNBP.

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