Tillage system effects on weed ecology, herbicide activity and persistence: a review
B. S. Chauhan A C , G. S. Gill A and C. Preston BA Discipline of Agricultural and Animal Science, The University of Adelaide, Roseworthy Campus, SA 5371, Australia.
B Discipline of Plant and Food Science, The University of Adelaide, Waite Campus, SA 5064, Australia.
C Corresponding author. Email: bhagirath.chauhan@adelaide.edu.au
Australian Journal of Experimental Agriculture 46(12) 1557-1570 https://doi.org/10.1071/EA05291
Submitted: 9 November 2005 Accepted: 16 June 2006 Published: 10 November 2006
Abstract
In the past few years, there has been a growing trend towards reducing tillage in cropping systems to allow stubble retention, earlier planting and improved soil structure. However, the adoption of conservation tillage systems will change weed control practices. Different tillage systems interact with the micro-environment of weed seeds and can influence the pattern of recruitment from the weed seed bank. Here, we present a review of the effect of different tillage systems on weed ecology, herbicide activity and herbicide persistence. Tillage systems can have a major influence on the vertical distribution of weed seeds in the soil seed bank. However, the impact of the changes in the vertical seed distribution on weed seedling recruitment is not well understood. Usually weed seedling recruitment increases if tillage equipment brings buried seed to, or close to, the soil surface, and seedling recruitment decreases if surface seed is buried deeper in the soil. However, tillage responses have a tendency to be species specific and can also be influenced by the intensity of tillage. Any weed species in which germination is stimulated by exposure to light is likely to become more prevalent under reduced tillage systems. Similarly, species that require burial for germination may become less prevalent. Crop residue present on the soil surface can also influence weed seedling recruitment by modifying the physical environment (mainly temperature) of weed seeds. Weed responses to plant residue could also be influenced by the allelopathic activity of the residue and the sensitivity of the weed species present. Few studies have investigated the fate of weed seeds that fail to germinate under any tillage system. Further research is needed to determine whether the weed seeds that fail to germinate decay before the start of the next growing season or become part of a persistent seed bank. Crop residues present on the soil surface can intercept a considerable amount of the applied herbicide and, depending on the herbicide, this intercepted component is susceptible to losses. Therefore, conservation tillage systems are expected to have lower efficacy of soil active herbicides. However, there has been little investigation of rate of loss of soil active herbicides under reduced tillage systems and the results reported have been inconsistent. Much of the research on these effects is from overseas and may not be true in Australian conditions. Therefore, further work is needed to clearly understand the impact of changing tillage systems on weed ecology, herbicide performance and persistence.
Acknowledgments
We thank two anonymous referees for helpful comments on the manuscript.
Ascard J
(1994) Soil cultivation in darkness reduced weed emergence. Acta Horticulturae 372, 167–177.
Banks PA, Robinson EL
(1982) The influence of straw mulch on the soil reception and persistence of metribuzin. Weed Science 30, 164–168.
Banks PA, Robinson EL
(1984) The fate of oryzalin applied to straw-mulched and non-mulched soils. Weed Science 32, 269–272.
Banting J
(1966) Studies on the persistence of Avena fatua. Canadian Journal of Plant Science 46, 129–140.
Barberi P
(2002) Weed management in organic agriculture: are we addressing the right issues? Weed Research 42, 177–193.
| Crossref | GoogleScholarGoogle Scholar |
Bardsley C,
Savage K, Walker J
(1968) Trifluralin behaviour in soils. II. Volatilization as influenced by concentration, time, soil moisture content, and placement. Agronomy Journal 60, 89–92.
Basham GW, Lavy TL
(1987) Microbial and photolytic dissipation of imazaquin in soil. Weed Science 35, 865–870.
Beestman GB, Deming JM
(1974) Dissipation of acetanilide herbicides from soils. Agronomy Journal 66, 308–311.
Benech-Arnold RL,
Sanchez RA,
Forcella F,
Kruk BC, Ghersa CM
(2000) Environmental control of dormancy in weed seed banks in soil. Field Crop Research 67, 105–122.
| Crossref | GoogleScholarGoogle Scholar |
Blum U,
King LD,
Greig TM,
Leiman ME, Worsham AD
(1997) Effects of clover and small crops and tillage techniques on seedling emergence of some dicotyledonous weed species. American Journal of Alternative Agriculture 12, 146–161.
Botto JF,
Scopel AL,
Ballare CL, Sanchez RA
(1998) The effect of light during and after soil cultivation with different tillage implements on weed seedling emergence. Weed Science 46, 351–357.
Bouwmeester HJ, Karssen CM
(1989) Environmental factors influencing the expression of dormancy patterns in weed seeds. Annals of Botany 63, 113–120.
Buchanan GA, Hiltbold AE
(1973) Performance and persistence of atrazine. Weed Science 21, 413–416.
Buhler DD
(1991) Influence of tillage systems on weed population dynamics and control in the northern corn belt of the United States. Advances in Agronomy (India) 1, 51–60.
Buhler DD
(1992) Population dynamics and control of annual weeds in corn (Zea mays) as influenced by tillage systems. Weed Science 40, 241–248.
Buhler DD
(1995) Influence of tillage systems on weed population dynamics and management in corn and soybean in the central USA. Crop Science 35, 1247–1258.
Buhler DD
(1997) Effects of tillage and light environment on emergence of 13 annual weeds. Weed Technology 11, 496–501.
Buhler DD, Daniel TC
(1988) Influence of tillage systems on giant foxtail (Setaria faberi) and velvetleaf (Abutilon theophrasti) density and control in corn (Zea mays). Weed Science 36, 642–647.
Buhler DD,
Stoltenberg DE,
Becker RL, Gunsolus JL
(1994) Perennial weed populations after 14 years of variable tillage and cropping practices. Weed Science 42, 205–209.
Bullied WJ,
Marginet AM, Van Acker RC
(2003) Conventional- and conservation-tillage systems influence emergence periodicity of annual weed species in canola. Weed Science 51, 886–897.
| Crossref |
Cardina J, Sparrow DH
(1997) Temporal changes in velvetleaf (Abutilon theophrasti) seed dormancy. Weed Science 45, 61–66.
Cheam AH
(1986) Seed production and seed dormancy in wild radish (Raphanus raphanistrum L.) and some possibilities for improving control. Weed Research 26, 405–413.
| Crossref |
Cheam AH
(1987) Emergence and survival of buried doublegee (Emex australis Steinh.) seeds. Australian Journal of Experimental Agriculture 27, 101–106.
| Crossref | GoogleScholarGoogle Scholar |
Cheam AH, Code GR
(1995) The biology of Australian weeds 24. Raphanus raphanistrum L. Plant Protection Quarterly 10, 2–13.
Chorbadjian R, Kogan M
(2004) Dormancy and germination studies on mallow (Malva parviflora). Ciencia e Investigacion Agraria 31, 129–136.
Clements DR,
Weise SF, Swanton CJ
(1994) Integrated weed management and weed species diversity. Phytoprotection 75, 1–18.
Code GR, Donaldson TW
(1996) Effect of cultivation, sowing methods and herbicides on wild radish populations in wheat. Australian Journal of Experimental Agriculture 36, 437–442.
| Crossref | GoogleScholarGoogle Scholar |
Cogo NP,
Moldenhauer WC, Foster GR
(1984) Soil loss reductions from conservation tillage practices. Soil Science Society of America Journal 48, 368–373.
Cousens RD, Moss SR
(1990) A model of the effects of cultivation on the vertical distribution of weed seeds within the soil. Weed Research 30, 61–70.
| Crossref |
Crutchfield DA,
Wicks GA, Burnside OC
(1986) Effect of winter wheat (Triticum aestivum) straw mulch level on weed control. Weed Science 34, 110–114.
Curran WS,
Liebl RA, Simmons FW
(1992) Effects of tillage and application method on clamazone, imazaquin and imazethapyr persistence. Weed Science 40, 482–489.
Cussans GW,
Raudonius S,
Brian P, Cumberworth S
(1996) Effects of depth of seed burial and soil aggregate size on seedling emergence of Alopecurus myosuroides, Galium aparine, Stellaria media and wheat. Weed Research 36, 133–141.
| Crossref |
Derksen DA,
Lafond GP,
Thomas AG,
Loeppky HA, Swanton CJ
(1993) Impact of agronomic practices on weed communities: tillage systems. Weed Science 41, 409–417.
Dillon SP, Forcella F
(1984) Germination, emergence, vegetative growth and flowering of two silvergrasses, Vulpia bromoides (L.) S.F.Gray and V. myuros (L.) C.C.Gmel. Australian Journal of Botany 32, 165–175.
| Crossref | GoogleScholarGoogle Scholar |
Doran JW
(1980) Soil microbial and biochemical changes associated with reduced tillage. Soil Science Society of America Journal 44, 765–771.
Dyer WE
(1995) Exploiting weed seed dormancy and germination requirements through agronomic practices. Weed Science 43, 498–503.
Egley GH
(1986) Stimulation of weed seed germination in soil. Reviews in Weed Science 2, 67–89.
Egley GH, Chandler JM
(1983) Longevity of weed seeds after 5.5 years in the Stoneville 50-year buried seed study. Weed Science 31, 264–270.
Egley GH,
Paul RN, Lax AR
(1986) Seed coat imposed dormancy: histochemistry of the region controlling onset of water entry into Sida spinosa L. Physiologia Plantarum 67, 320–327.
| Crossref | GoogleScholarGoogle Scholar |
Ellington A
(1979) Energy requirements and operating costs of reduced versus conventional tillage. Agricultural Engineering Australia 8, 87–99.
Erbach DC, Lovely WG
(1975) Effect of plant residue on herbicide performance in no-tillage corn. Weed Science 23, 512–515.
Eric S,
Berverly RD, Frank F
(1999) Foxtail (Setaria spp.) seedling dynamics in spring wheat (Triticum aestivum) are influenced by seeding date and tillage regime. Weed Science 47, 156–160.
Feldman SR,
Alzugaray C,
Torres PS, Lewis P
(1996) The effect of different tillage systems on the composition of the seedbank. Weed Research 37, 71–76.
| Crossref | GoogleScholarGoogle Scholar |
Fernandez-Quitanilla C,
Navarrete L,
Andujar JLG,
Fernandez A, Sanchez MJ
(1986) Seedling recruitment and age-specific survivorship and reproduction in populations of Avena sterilis L. ssp. ludoviciana (Durieu) Nyman. Journal of Applied Ecology 23, 945–955.
| Crossref | GoogleScholarGoogle Scholar |
Foley ME
(2001) Seed dormancy: an update on terminology, physiological genetics, and quantitative trait loci regulating germinability. Weed Science 49, 305–317.
| Crossref |
Forcella F
(1984) Size structure of silvergrass (Vulpia spp.) populations in direct drilled wheat. Australian Weeds 3, 3–5.
Froud-Williams RJ,
Chancellor RJ, Drennan DSH
(1981) Potential changes in weed floras associated with reduced-cultivation systems for cereal production in temperate regions. Weed Research 21, 99–109.
| Crossref |
Gallagher RS, Cardina J
(1998) The effect of light environment during tillage on the recruitment of various summer annuals. Weed Science 46, 214–216.
Gallandt ER, Haramoto ER
(2004) Brassica cover cropping for weed management: a review. Renewable Agriculture and Food Systsems 19, 187–198.
| Crossref | GoogleScholarGoogle Scholar |
Ghadiri H,
Shea PJ, Wicks GA
(1984) Interception and retention of atrazine by wheat (Triticum aestivum) stubble. Weed Science 32, 24–27.
Gill G, Holmes JE
(1997) Efficacy of cultural control methods for combating herbicide-resistant Lolium rigidum. Pesticide Science 51, 352–358.
| Crossref | GoogleScholarGoogle Scholar |
Gleichsner JA, Appleby AP
(1989) Effect of depth and duration of seed burial on rigput brome (Bromus rigidus). Weed Science 37, 68–72.
Gramshaw D
(1976) Temperature/light interactions and the effect of seed source on germination of annual ryegrass (Lolium rigidum Gaud.) seeds. Australian Journal of Agricultural Research 27, 779–786.
| Crossref | GoogleScholarGoogle Scholar |
Gramshaw D, Stern W
(1977) Survival of annual ryegrass (Lolium rigidum Gaud.) seed in a Mediterranean type environment. II. Effects of short-term burial on persistence of viable seed. Australian Journal of Agricultural Research 28, 93–101.
| Crossref | GoogleScholarGoogle Scholar |
Grover R,
Wolt J,
Cessna A, Schiefer H
(1997) Environmental fate of trifluralin. Reviews of Environmental Contamination and Toxicology 153, 1–16.
| PubMed |
Hartmann KM, Nezadal W
(1990) Photocontrol of weeds without herbicides. Die Naturwissenschaften 77, 158–163.
| Crossref | GoogleScholarGoogle Scholar |
Hill GD,
McGaben JW,
Baker HM,
Finnerty DW, Bingeman CW
(1955) The fate of substituted urea herbicides in agricultural soils. Agronomy Journal 47, 93–103.
Horowitz M, Taylorson RB
(1984) Hardseededness and germinability of velvetleaf (Abutilon theophrasti) as affected by temperature and moisture. Weed Science 32, 111–115.
House GJ, Brust GE
(1989) Ecology of low input, no-tillage agrosystems. Agriculture Ecosystems and Environment 27, 331–345.
| Crossref | GoogleScholarGoogle Scholar |
Isensee AR, Sadeghi AM
(1994) Effects of tillage and rainfall on atrazine residue levels in soil. Weed Science 42, 462–467.
Jensen PK
(1992) First danish experiences with photocontrol of weeds. Journal of Plant Diseases and Protection 13, 631–636.
Johnson MD,
Wyse DL, Lueschen WE
(1989) The influence of herbicide formulation on weed control in four tillage systems. Weed Science 37, 239–249.
Johnstone PK,
Jolley AV,
Code GR,
Moerkerk MR, Corbett A
(1998) Degradation of trifluralin in three Victorian soils- long-term field trials. Australian Journal of Experimental Agriculture 38, 363–374.
| Crossref | GoogleScholarGoogle Scholar |
Jones RE,
Banks PA, Radcliffe DE
(1990) Alachlor and metribuzin movement and dissipation in a soil profile as influenced by soil surface condition. Weed Science 38, 589–597.
Kapustra G
(1979) Seedbed tillage and herbicide influence on soybean (Glycine max) weed control and yield. Weed Science 27, 520–526.
Kapustra G, Strieker CF
(1976) Herbicidal weed control in stubble no-till planted corn. Weed Science 24, 605–611.
Kelly KM,
Van Staden J, Ball WE
(1992) Seed coat structure and dormancy. Plant Growth Regulator 11, 201–209.
| Crossref | GoogleScholarGoogle Scholar |
Kennedy JM, Talbert RE
(1977) Comparative persistence of dinitroaniline type herbicides on the soil surface. Weed Science 25, 371–381.
Kettler TA,
Lyon DJ,
Doran JW,
Powers WL, Stroup WW
(2000) Soil quality assessment after weed-control tillage in a no-till wheat-fallow cropping system. Soil Science Society of America Journal 64, 339–346.
Koskinen WC, McWhorter CG
(1986) Weed control in conservation tillage. Journal of Soil and Water Conservation 41, 365–370.
Lambert SM
(1967) Functional relationship between sorption in soil and chemical structures. Journal of Agricultural and Food Chemistry 15, 572–576.
| Crossref | GoogleScholarGoogle Scholar |
Leopold AC,
van Scaik P, Neal M
(1960) Molecular structure and herbicide absorption. Weeds 8, 48–54.
Locke MA, Bryson CT
(1997) Herbicide-soil interactions in reduced tillage and plant residue management systems. Weed Science 45, 307–320.
McGowan A
(1970) Comparative germination patterns of annual grasses in north-eastern Victoria. Australian Journal of Experimental Agriculture and Animal Husbandry 10, 401–404.
| Crossref | GoogleScholarGoogle Scholar |
Mack RN, Pyke DA
(1983) The demography of Bromus tectorum: variation in time and space. Journal of Ecology 71, 69–93.
| Crossref | GoogleScholarGoogle Scholar |
Malik N, Vanden Born WH
(1987) Germination response of Galium spurium L. to light. Weed Research 27, 251–258.
| Crossref |
Medd RW
(1987) Conservation tillage and weed revolutions. Plant Protection Quarterly 2, 31–34.
Mekenian MR, Willemsen RW
(1975) Germination characteristics of Raphanus raphanistrum L. Laboratory studies. Bulletin of the Torrey Botanical Club 102, 243–252.
| Crossref | GoogleScholarGoogle Scholar |
Milberg P,
Andersson L, Noronha A
(1996) Seed germination after short duration light exposure: Implications for the photo-control of weeds. Applied Ecology 33, 1469–1478.
| Crossref | GoogleScholarGoogle Scholar |
Mills JA,
Witt WW, Barrett M
(1989) Effects of tillage on the efficacy and persistence of clamazone in soybean (Glycine max). Weed Science 37, 217–222.
Mohler CL
(1993) A model of the effects of tillage on emergence of weed seedlings. Ecological Applications 3, 53–73.
| Crossref | GoogleScholarGoogle Scholar |
Mohler CL, Calloway MB
(1995) Effects of tillage and mulch on weed seed production and seed banks in sweet corn. Journal of Applied Ecology 32, 627–639.
| Crossref | GoogleScholarGoogle Scholar |
Mohler CL, Teasdale JR
(1993) Response of weed emergence to rate of Vicia villosa Roth and Secale cereale L. residue. Weed Research 33, 487–499.
| Crossref |
Morgan WC
(1988) Alternatives to herbicides. Plant Protection Quarterly 4, 33–37.
Mueller TC,
Moorman TB, Snipes CE
(1992) Effect of concentration, sorption and microbial biomass on degradation of the herbicide fluometuron in surface and subsurface soils. Journal of Agricultural and Food Chemistry 40, 2517–2522.
| Crossref | GoogleScholarGoogle Scholar |
Oegema T, Fletcher RA
(1972) Factors that influence dormancy in milkweed seeds. Canadian Journal of Botany 50, 713–718.
Ogg AG, Dawson JH
(1984) Time of emergence of eight weed species. Weed Science 32, 327–335.
Oliver L, Frans R
(1968) Inhibition of cotton and soybean roots from incorporated trifluralin and persistence in soil. Weed Science 16, 199–203.
Oryokot JOE,
Murphy SD, Swanton CJ
(1997) Effect of tillage and corn on pigweed (Amaranthus spp.) seedling emergence and density. Weed Science 45, 120–126.
Pareja MR,
Staniforth DW, Pareja GP
(1985) Distribution of weed seeds among soil structural units. Weed Science 33, 182–189.
Parka SJ, Soper QF
(1977) The physiology and mode of action of the dinitroaniline herbicides. Weed Science 25, 79–87.
Parochetti J, Dec G
(1978) Photodecomposition of eleven dinitroaniline herbicides. Weed Science 26, 153–156.
Pearce GA, Holmes JE
(1976) The control of annual ryegrass. Journal of Agriculture of Western Australia 17, 77–81.
Peter CJ, Weber JB
(1985) Adsorption and efficacy of trifluralin and butralin as influenced by soil properties. Weed Science 33, 861–867..
Pons TL
(1989) Breaking of seed dormancy by nitrate as a gap detection mechanism. Annals of Botany 63, 139–143.
Popay AI,
Cox TI,
Ingle A, Kerr R
(1994) Effects of soil disturbance on weed seedling emergence and its long-term decline. Weed Research 34, 403–412.
| Crossref |
Pratley JE
(1995) Long term investigations of the effect of tillage practices on crop production at Wagga Wagga, New South Wales. Australian Journal of Experimental Agriculture 35, 885–892.
| Crossref | GoogleScholarGoogle Scholar |
Prendeville GN,
Eshel Y,
Schreiber MM, Warren GF
(1967) Site of uptake of soil-applied herbicides. Weed Research 7, 316–322.
| Crossref |
Puricelli EC, Tuesca DH
(1997) Analysis of weed community changes and their determining factors in no-tillage systems. Revista de la Facultad de Agronomia La Plata 102, 97–118.
Putnam AR, DeFrank J
(1983) Use of phytotoxic plant residues for selective weed control. Crop Protection 2, 173–181.
| Crossref | GoogleScholarGoogle Scholar |
Putnam AR,
DeFrank J, Barnes JP
(1983) Exploitation of allelopathy for weed control in annual and perennial cropping systems. Journal of Chemical Ecology 9, 1001–1010.
| Crossref | GoogleScholarGoogle Scholar |
Reeves TG,
Code GR, Piggin CM
(1981) Seed production and logevity, seasonal emergence and phenology of wild radish (Raphanus raphanistrum L.). Australian Journal of Experimental Agriculture and Animal Husbandry 21, 524–530.
| Crossref | GoogleScholarGoogle Scholar |
Roberts HA
(1963) Studies on the weeds of vegetable crops. III. Effects of different primary cultivations on the weed seeds in the soil. Journal of Ecology 51, 83–95.
| Crossref | GoogleScholarGoogle Scholar |
Robertson WK,
Lundy RW,
Prine GM, Currey WL
(1976) Planting corn in sod and small grain residues with minimum tillage. Agronomy Journal 68, 271–274.
Sadeghi AM,
Isensee AR, Shelton DR
(1998) Effect of tillage age on herbicide dissipation: a side-by-side comparison using microplots. Soil Science 163, 883–890.
| Crossref | GoogleScholarGoogle Scholar |
Sauer J, Struik G
(1964) A possible ecological relation between soil disturbance, light flash, and seed germination. Journal of Ecology 45, 554–556.
Savage K, Barrentine W
(1969) Trifluralin persistence as affected by depth of soil incorporation. Weed Science 17, 349–352.
Scopel AL,
Ballare CL, Radosevich SR
(1994) Photostimulation of seed germination during soil tillage. New Phytologist 126, 145–152.
| Crossref | GoogleScholarGoogle Scholar |
Sharma MP, Vanden Born WH
(1978) The biology of Canadian weeds. 27. Avena fatua L. Canadian Journal of Plant Science 58, 141–157.
Sheets TJ
(1958) The comparative toxicities of four phenylurea herbicides in several soil types. Weeds 6, 413–424.
Singh HP,
Batish DR, Kohli RK
(2001) Allelopathy in agroecosystems: an overview. Journal of Crop Production 4, 1–41.
| Crossref | GoogleScholarGoogle Scholar |
Slack C,
Blevins R, Rieck C
(1978) Effect of soil pH and tillage on persistence of simazine. Weed Science 26, 145–148.
Smith DF
(1968) The growth of barley grass (Hordeum leporinum) in annual pasture 1. Germination and establishment in comparison with other annual pasture species. Australian Journal of Experimental Agriculture and Animal Husbandry 8, 478–483.
| Crossref | GoogleScholarGoogle Scholar |
Sorenson BA,
Shea PJ, Roeth FW
(1991) Effects of tillage application time and rate on metribuzin dissipation. Weed Research 31, 335–345.
| Crossref |
Staricka JA,
Burford PM,
Allmaras RR, Nelson WW
(1990) Tracing the vertical distribution of simulated shattered seeds as related to tillage. Agronomy Journal 82, 1131–1134.
Steadman KJ
(2004) Dormancy release during hydrated storage in Lolium rigidum seeds is dependent on temperature, light quality, and hydration status. Journal of Experimental Botany 55, 929–937.
| Crossref | GoogleScholarGoogle Scholar | PubMed |
Steinsiek JW,
Oliver LR, Collins FC
(1982) Allelopathic potential of wheat (Triticum aestivum) straw on selected weed species. Weed Science 30, 495–497.
Streit B,
Rieger SB,
Stamp P, Richner W
(2003) Weed populations in winter wheat as affected by crop sequence, intensity of tillage and time of herbicide application in a cool and humid climate. Weed Research 43, 20–32.
| Crossref | GoogleScholarGoogle Scholar |
Taylor IN,
Peters NCB,
Adkins SW, Walker SR
(2004) Germination response of Phalaris paradoxa L. seed to different light qualities. Weed Research 44, 254–264.
| Crossref | GoogleScholarGoogle Scholar |
Taylorson RB
(1970) Changes in dormancy and viability of weed seeds in soils. Weed Science 18, 265–269.
Thelen KD,
Kells JK, Penner D
(1988) Comparison of application methods and tillage practices on volatilization of clomazone. Weed Technology 2, 323–326.
Thompson K, Grime J
(1979) Seasonal variation in the seed banks of herbaceous species in ten contrasting habitats. Journal of Ecology 67, 893–921.
| Crossref | GoogleScholarGoogle Scholar |
Torresen KS,
Skuterud R,
Tandsaether HJ, Hagemo MB
(2003) Long-term experiments with reduced tillage in spring cereals. I. Effects on weed flora, weed seedbank and grain yield. Crop Protection 22, 185–200.
| Crossref | GoogleScholarGoogle Scholar |
Touchton JT, Johnson JW
(1982) Soybean tillage and planting methods effect on yield of double-cropped wheat and soybeans. Agronomy Journal 74, 57–59.
Triplett GB, VanDoren DM
(1977) Agriculture without tillage. Scientific American 236, 28–33.
| PubMed |
Triplett GB, Lytle GD
(1972) Control and ecology of weeds in continuous corn grown without tillage. Weed Science 20, 453–457.
Turner SR,
Meritt DJ,
Baskin CC,
Dixon KW, Baskin JM
(2005) Physical dormancy in seeds of six genera of Australian Rhamnaceae. Seed Science Research 15, 51–58.
| Crossref | GoogleScholarGoogle Scholar |
Unger PW
(1981) Tillage effects on wheat and sunflower grown in rotation. Soil Science Society of America Journal 45, 941–945.
Upchurch RP, Mason DD
(1962) The influence of soil organic matter on the phytotoxicity of herbicides. Weeds 10, 9–14.
Walker A, Bond W
(1977) Persistence of the herbicide AC 92,553 [N-(1-ethylpropyl)-2,6-dinitro-3,4-xylidine] in soils. Pesticide Science 8, 359–365.
| Crossref |
Weber JB
(1990) Behaviour of dinitroaniline herbicides in soils. Weed Technology 4, 394–406.
Wesson G, Wareing PF
(1969) The induction of light sensitivity in weed seeds by burial. Journal of Experimental Botany 20, 414–425.
Weston LA
(1996) Utilization of allelopathy for weed management in agroecosystems. Agronomy Journal 88, 860–866.
White RH,
Worsham AD, Blum U
(1989) Allelopathic potential of legume debris and aqueous extracts. Weed Science 37, 674–679.
Wiese AM, Binning LK
(1987) Calculating the threshold temperature of developments for weeds. Weed Science 35, 177–179.
Wilson BJ, Cussans GW
(1975) A study of the population dynamics of Avena fatua L. as influenced by straw burning, seed shedding and cultivations. Weed Research 15, 249–258.
| Crossref |
Wooley JT, Stroller E
(1978) Light penetration and light-induced seed germination in soil. Plant Physiology 61, 597–600.
| PubMed |
Worsham AD
(1984) Crop residues kill weeds-allelopathy at work with wheat and rye. Crops and Soils Management 37, 18–20.
Wright W, Warren G
(1965) Photochemical decomposition of trifluralin. Weeds 13, 329–331.
Yenish JP,
Doll JD, Buhler DD
(1992) Effects of tillage on vertical distribution and viability of weed seed in soil. Weed Science 40, 429–433.
Yenish JP,
Fry TA,
Durgan BR, Wyse DL
(1996) Tillage effects on seed distribution and common milkweed (Asclepias syriaca) establishment. Weed Science 44, 815–820.
Yu CC,
Booth GM,
Hansen DJ, Larsen JR
(1975) Fate of alachlor and propachlor in a model ecosystem. Journal of Agricultural and Food Chemistry 23, 877–879.
| Crossref | GoogleScholarGoogle Scholar | PubMed |
Zimdahl RL, Clark SK
(1982) Degradation of three acetanilide herbicides in soil. Weed Science 30, 545–548.
