Vol. 16—1962 - NorthEastern Weed Science Society

Vol. 16—1962 - NorthEastern Weed Science Society Vol. 16—1962 - NorthEastern Weed Science Society

08.06.2015 Views

286 Introduction: A SUMMARYOF QUACmRASSCOR1'9JLS'l!l1DIE PUR'$' 8tQl!M'II!,Ia; Fe7!ti~ '(n-: ::\. , .• '., - _,., ', :" "';; _ ::-r", ;~j,:.J .:.'HO : 'r .:-;:",);.- . " .... : Quackgr•••. ;cplllMt~;tI~'C&ll be,f" ..pIlIJortactor 111-* yi.~d of com for silage o~ forp'a1A •. ;Ita I!8du~1qpiJ1D,.stapdot ~lo8s e,nd.reduce4 compet1tiot1l,s to .be ol!t~ by. c~~ppe%!,.tlOras, ~"tJ3ey IIIWJtbe. frequent ~ pr(lpeJ,').~t1med. ; TJ:ut,.~pf: a a1D{1le ClJMiCl~ ,01', 'CQIIIb1,natlon of chem1cal8pl~ q~t~ope?:''''1I~'ha''ProveJl ~.SIliliY let~ect1ve1n controlling qua.ckgr~s,. 'rhe',cp~d*¥!,t1on of~ ePlus Pfe'" :~"'IIZ'J.y pojJt-emersence herb1c1@,~~n\l wp.l ,elind~".~assC9IIP8U,to.ton :l.n corn for the growing season and Where moisture, 4-f,~t1ng o~~~t1n ;y1e,ld:l.ncreases of silage 01' grain by 50 - 100 percent. Method and;. frss,q,u.i;e:: \ ,:.' _' ;'~ ,1" 'I -}

If or where farmer acceptance of a chemiceJ. treatment is based on visueJ. observation or the absence of vegetation, the above treatments would be considered unsatisfactory even though the yielda may not be affected. 'Including the cultivated and non-cultivated treatments, 18 )'leld values are represented in the above treatments rated as poor or fair in control. The yields from 9 of these plots are, however, in the first 20 highest yields obtained in the experiment. A clear d:l.stinct10n should be made between seasoneJ. suppression, reduced stands and kill or el1m1nation of quacltgr8ss when writing for or . - . . - ~ :287 are reported in pounds per aereef 20 percent lII01ature hay equi veJ.ent • The CQrn silage yields were calculated from the harvest of 2 - 10 foot .ections of row,tuen from the center area of thecml;t1vated and from the center area of the non-cultivated portions of eaoh treatment. A random I sampJ.e was ,ara~;f'rom the harvested plants, chopped and a 2,000 gram sample of chopped :ulaterial was oven dried to determine dry matter content. The yields of IJilage in tons per acre at 75 percent moisture were calculated from these values. Discussion~ All chem:lca]. trea~tson the corn stubble plots (Table I) when combined withoult:l..vat10n resulted in e. significant reduction in the competitive effects of~&s as indicatedby' the silage yields. As shown by the y:te~ds of quackgz!ass foliage '911l1l1l.Dytreatments, however, the effect was dUe to a reduction in the vigor and jp'OWthof quackgrass rather than effective' klll. Whenthe plots were harvested' in September ti1Elre was an excellent cover of quack8ras. on treatments 3, 5, '6, 10, 12 and to a lesser extent 14. _n though the yields of s1188e were GOt significantly reduced on these trea1j. ments, the ~ll of quackgrass was: rated fair to very poor. It is fair to ' assume that had mo:l.sture conditions been less favorable throughout the growing season, 'the y1elds would have..been reduced by .M¥eral tons· per acre. A CClZIIliletekill of quackiras.$ is possible by ~ated applications of plow-down and pre" or post-emergel)ce chemical treatments. The same total SlIPunt of eJJemical :l.n split applications has been tar more effective in killing quackgra8s compared to a single application. Where kill of quaekgre.ss is desired, the cost of an additional spray treatment is Justified. The silage yields from treatments on the sod area (Table II) are eJ.S(). quite uniform Within the cultivated and non-cultivated plots. A significant yield difference at the 5 percent level does exist'l\l4!ltween some treatments. Considering the combination of cClll,POundsand treatments used, however, these d:l.fferences are small. Also, based only on the yields obtained from the cultivated and nonoultivated, the Value of cultivation would be questioned. Visual ratings on the oontrol of quaekgrasll at the tlme of harvest, however) shewed a definite adve:atage for cultivation in kill1ng quackgrass. Even though the yields do not reflect it, treatments 6, 10, 13, 15, 21 and 23 were rated poor control and treatments 14, 18 and 22 were rated fair control.

286<br />

Introduction:<br />

A SUMMARYOF QUACmRASSCOR1'9JLS'l!l1DIE PUR'$'<br />

8tQl!M'II!,Ia; Fe7!ti~ '(n-:<br />

::\.<br />

, .• '., - _,., ', :" "';; _ ::-r", ;~j,:.J .:.'HO : 'r .:-;:",);.- . " .... :<br />

Quackgr•••. ;cplllMt~;tI~'C&ll be,f" ..pIlIJortactor 111-* yi.~d of com for<br />

silage o~ forp'a1A •. ;Ita I!8du~1qpiJ1D,.stapdot ~lo8s e,nd.reduce4 compet1tiot1l,s<br />

to .be ol!t~ by. c~~ppe%!,.tlOras, ~"tJ3ey IIIWJtbe.<br />

frequent ~ pr(lpeJ,').~t1med. ; TJ:ut,.~pf: a a1D{1le ClJMiCl~ ,01', 'CQIIIb1,natlon<br />

of chem1cal8pl~ q~t~ope?:''''1I~'ha''ProveJl ~.SIliliY let~ect1ve1n controlling<br />

qua.ckgr~s,. 'rhe',cp~d*¥!,t1on of~ ePlus Pfe'" :~"'IIZ'J.y pojJt-emersence<br />

herb1c1@,~~n\l wp.l ,elind~".~assC9IIP8U,to.ton :l.n corn for the<br />

growing season and Where moisture, 4-f,~t1ng o~~~t1n ;y1e,ld:l.ncreases<br />

of silage 01' grain by 50 - 100 percent.<br />

Method and;.<br />

frss,q,u.i;e::<br />

\ ,:.' _' ;'~ ,1" 'I -}

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