Vol. 15â1961 - NorthEastern Weed Science Society
Vol. 15â1961 - NorthEastern Weed Science Society Vol. 15â1961 - NorthEastern Weed Science Society
32S. Amitrol-T was intermediate in its effect on both food reserves and topgrowth. It resulted in good kill and regrowth suppression throughout most of the growing season. Some stubble survived, however» and regrowth occurred in late fall. Spring plowing resulted in a large initial reduction-in food reserves which persisted until sufficient regrowth had occurred to replenish the underground organs • . Continuous fallow. on the other hand, .eontinuedto deplete the rhizome ."reserves throughout the experiment. Interactions between reserves are diScussed. chemical and' cultural treatments on the rhizome LITERATURECITED 1. LeBaron. H.M. and Fertig. S. N. Relationships between control-of qU8ckgrass (AgropyronreRens) and carbohydrate contet').t of rhizomes. Northeastern Weed Control Conf. Proc.-14: 357-362 (1960)
329. Further studies on a growth inhibitor from Agropyron repens (Q,uackgrass)+ . ++ c. W~LeFevre and C. O. Clagett At the 1960 Northeastern Weed Control Conference (1) we presented a brief literature review and a preliminary report on the concentration of a growth inhibitor from quackgrass. In this presentation we are summarizing our 1960 progress on the isolation of the inhibitor(s). Experimental Procedure Extraction. In order to determine the rate of water extraction of the inhibitor ingraun4 ~hizamos'a 40 x .8 CM. column containing 4 gIn of the mat.e r-LaL mixed with asbestos was prepared. \'later was leached through the column and the leachate was collected in 5 mI. portions with a G.M.E. fraction collector. The ~olume of water necessar.y for complete elution is found in figure 1. This method 01; elution was so effective that it was modified and u'se d for further extractions. A few grams of ground plant material were placed in a sintered glass crucible containing a layer of cellite over the porous glass. This was leached under vacuum into a flask maintained at 50°C so that extraction and evaporation was accomplished in one ope r-a.t.Lon, Paper Chromatographic Separation ·The concentrated extract was streaked on S & S 470A filter paper and irrigated with a Whatman No. I wick. Solvent systems were prepared as follows: (1) Ethanol-water (80-20 v/v) v (2) 2-butanone-T bulanol-wate.r (50-30-20 /v). (3) N-butanol saturated with water; (4) Phenol-Water (80-20 Vtv; (5) Dioxane-water (75-25 /v; and (6) Dioxane-Methanol Acetone-Water (30-30-20-20 v/v. The papers were sectioned, the sections eluted, and the elulates tested for activity. The assay involved measuring the growth of three replications of 5 alfalfa seeds in 5 ml beakers containing filter papers wetted with .5 ml test solution. The eluate was concentrated and recromatographed using other solvent systems. + Progress and 1218. report on Experiment station projects N.E. 42-1375 ++ Agronomy and Agricultural and Biological Chemistry Department Pennsylvania State University, University Park, Pennsylvania
- Page 277 and 278: 277. In one area, the old turf was
- Page 279 and 280: 279. following application. The hig
- Page 281 and 282: 2$1. The standard date of applicati
- Page 283 and 284: Table 2. Effect of season of applyi
- Page 285 and 286: L 1-l34B9 ,Jiphenyllactelonitrile o
- Page 287 and 288: 287. Halts F-24, Halts F-26, Halts
- Page 289 and 290: POST-.EJ.iEhGENCE CONThOLOF CIiABGI
- Page 291 and 292: ,veedone at 4 pounds of tL.cl per a
- Page 293 and 294: ( ( ( Table I. Post-Emergence Contr
- Page 295 and 296: • •• ., .. • •• ',' •
- Page 297 and 298: 297. compatible with grub-proofing
- Page 299 and 300: 299, Diphenatrile Results During th
- Page 301 and 302: 301. tentative generic name triflur
- Page 303 and 304: - 1 PRE-ENERGENCE CRABGRASS CONTROL
- Page 305 and 306: Discussion 30; • a) Pre-emergence
- Page 307 and 308: 307. TABLEI -- Comparison of Produc
- Page 309 and 310: -' Table II (can't) 309. Stand of S
- Page 312 and 313: 312. THEEFFECTIVENESSOF COMBINATION
- Page 314 and 315: 314. Table 2. Stand Counts and Sile
- Page 316 and 317: 316. planted control before these h
- Page 318 and 319: Table II. The control of quackgrass
- Page 320 and 321: 320. growing season in the 1957-59
- Page 322 and 323: 322. Table I Main Effects of Cultur
- Page 324 and 325: 324. Atrazine by September 10 when
- Page 326 and 327: 326. Another effect of Atrazine tha
- Page 330 and 331: Qolumn Separation: Cellulose. A 24
- Page 332 and 333: 332, Figure -I. Chromatogram of qua
- Page 334 and 335: 334. PRELIMINARYRESULTSONTHE USE OF
- Page 336 and 337: 336. DATEOF BERRYHARVESTAS IT AFFEC
- Page 338 and 339: within three inches of the soIl sur
- Page 340 and 341: 340 .. The growth ra.te of Horse ne
- Page 342 and 343: 342. dish containing ten seeds bet\
- Page 344 and 345: 344. is not a factor in in It is
- Page 346 and 347: 346 • .Absornt:j.Qn Qn Exchange R
- Page 348 and 349: 348. The' chrona tog ram."WaS first
- Page 350 and 351: 350. PROGRESSREPORTON A STUDYOF THE
- Page 352 and 353: 352. 7. Fluctuating warm and cold w
- Page 354 and 355: 354. A clos.e correlation was found
- Page 356 and 357: 356. 1 THE ANATOMICAL NATUREO:BTHE
- Page 358 and 359: 358. The 2,4,5-TP was most effectiv
- Page 360 and 361: Table I. Effect. of Pre-emergence T
- Page 362 and 363: INTRODUCIIOB: THEEFFECTOF WEEDCOMPE
- Page 364 and 365: 1";. 1958 JFab1e I (cont ' d) Treat
- Page 366 and 367: 366. fiE USE OF FENACFOR QUACKGRASS
- Page 368 and 369: 36$. SUMMARY: Based on a I).umber o
- Page 370 and 371: - Table 1. Chemicals and Rates Used
- Page 372 and 373: 372. On spring plowed plots I where
- Page 374 and 375: Table 1. Treat.ments Used and Stand
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32S.<br />
Amitrol-T was intermediate in its effect on both food reserves and<br />
topgrowth. It resulted in good kill and regrowth suppression throughout<br />
most of the growing season. Some stubble survived, however» and regrowth<br />
occurred in late fall.<br />
Spring plowing resulted in a large initial reduction-in food reserves<br />
which persisted until sufficient regrowth had occurred to replenish the<br />
underground organs •<br />
. Continuous fallow. on the other hand, .eontinuedto deplete the rhizome<br />
."reserves throughout the experiment.<br />
Interactions between<br />
reserves are diScussed.<br />
chemical and' cultural treatments on the rhizome<br />
LITERATURECITED<br />
1. LeBaron. H.M. and Fertig. S. N.<br />
Relationships between control-of qU8ckgrass (AgropyronreRens) and<br />
carbohydrate contet').t of rhizomes.<br />
Northeastern <strong>Weed</strong> Control Conf. Proc.-14: 357-362 (1960)
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