No Tillage and Strip Tillage Effects on Plant Performance, Weed Suppression, and Profitability in Transitional Organic Broccoli Production

in HortScience

Organic no-till and strip-till systems have gained attention because of their reported capacity to enhance soil health and suppress annual weeds. This study, conducted at the Horticulture Research Station, Ames, IA, over 2 years (2013–14 and 2014–15) compared a cover crop–based no tillage (NT), strip tillage (ST), and conventional tillage (CT) in transitional organic broccoli (Brassica oleracea L. var. italica) production, with data collected on broccoli yield and quality, plant health, weed suppression, soil temperature, and cost of production. A cover crop mixture of cereal rye (Secale cereale L.) and hairy vetch (Vicia villosa Roth.) was seeded in all plots in September, and was ended by rolling and crimping (NT and ST) or soil incorporation (CT) in late spring the following year. Each whole-plot tillage treatment was split into two subplot fertility treatments—one based entirely on organic preplant granular fertilizer, and the other split between preplant granular fertilizer and postplanting fertigation—to test the effect of fertigation on yield and plant growth under the typically nitrogen (N)-limited reduced tillage conditions. In 2014, yield of broccoli was highest in CT treatments, averaging 5.4 t·ha−1, with no difference between ST and NT treatments. In 2015, yields were equal among tillage treatments, averaging 20.0 t·ha−1. Changing the timing of fertilizer application through the use of fertigation did not affect yield. Weed density and biomass were lowest in the between-row (BR) regions of NT and ST plots in 2014, indicating effective early-season weed suppression. In 2015, NT and ST plots generally had lower weed biomass and density compared with CT plots, but weed growth in BR and in-row (IR) regions of NT and ST plots was similar. Soil temperature was highest in CT plots throughout the year, and higher in ST than in NT plots only during some periods. While production costs did vary slightly across treatments, profit per hectare was most strongly affected by yield. Our findings suggest that cover crop–based organic NT and ST systems may be viable options for organic broccoli growers.

Contributor Notes

We would like to thank and acknowledge the Ceres Trust and United States Department of Agriculture North Central Sustainable Agriculture Research and Education grant number GNC14-189 for the financial support to conduct this study.

Corresponding author. E-mail: nairajay@iastate.edu.

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    Monthly rainfall and mean air temperature in 2014 and 2015 in Ames, IA, compared with the 30-year average. Weather data were obtained from the Iowa State University Soil Moisture Network.

Article References

  • Abdul-BakiA.A.TeasdaleJ.R.KorcakR.ChitwoodD.J.HuettelR.N.1996Fresh-market tomato production in a low-input alternative system using cover-crop mulchHortScience316569

    • Search Google Scholar
    • Export Citation
  • AshfordD.L.ReevesD.W.2003Use of a mechanical roller-crimper as an alternative kill method for cover cropsAmer. J. Alt. Agr.183745

  • AulakhM.S.WaltersD.T.DoranJ.W.FrancisD.D.MosierA.R.1991Crop residue type and placement effects on denitrification and mineralizationSoil Sci. Soc. Amer. J.5510201025

    • Search Google Scholar
    • Export Citation
  • BakerJ.M.OchsnerT.E.VentereaR.T.GriffisT.J.2007Tillage and soil carbon sequestration: What do we really know?Agr. Ecosyst. Environ.11815

    • Search Google Scholar
    • Export Citation
  • BerryP.M.Sylvester-BradleyR.PhilippsL.HatchD.J.CuttleS.P.RaynsF.W.GoslingP.2002Is the productivity of organic farms restricted by the supply of available nitrogen?Soil Use Mgt.18248255

    • Search Google Scholar
    • Export Citation
  • BoslandP.W.WilliamsP.H.MorrisonR.H.1988Influence of soil temperature on the expression of yellows and wilt of crucifers by Fusarium oxysporumPlant Dis.72777780

    • Search Google Scholar
    • Export Citation
  • BrainardD.C.NoyesD.C.2012Strip tillage and compost influence carrot quality, yield, and net returnsHortScience4710731079

  • BrainardD.C.PeacheyE.HaramotoE.R.LunaJ.M.RangarajanA.2013Weed ecology and nonchemical management under strip-tillage: Implications for northern U.S. vegetable cropping systemsWeed Technol.27218230

    • Search Google Scholar
    • Export Citation
  • ChaseC.2011Iowa fruit & vegetable production budgets. 6 Oct. 2015. <http://www.extension.iastate.edu/agdm/crops/html/a1-17.html>.

  • CiacciaC.CanaliS.CampanelliG.TestaniE.MontemurroF.LeteoF.DelateK.2016Effect of roller-crimper technology on weed management in organic zucchini production in a Mediterranean climate zoneRenewable Agr. Food Systems31111121

    • Search Google Scholar
    • Export Citation
  • ClarkA.2007Managing cover crops profitably. 3rd ed. Sustainable Agriculture Research and Education Beltsville MD

  • CreamerN.G.BennettM.A.StinnerB.R.CardinaJ.1996aA comparison of four processing tomato production systems differing in cover crop and chemical inputsJ. Amer. Soc. Hort. Sci.121559568

    • Search Google Scholar
    • Export Citation
  • CreamerN.G.BennettM.A.StinnerB.R.CardinaJ.RegnierE.E.1996bMechanisms of weed suppression in cover crop-based production systemsHortScience31410413

    • Search Google Scholar
    • Export Citation
  • DelateK.CambardellaC.McKernA.2008Effects of organic fertilization and cover crops on an organic pepper systemHortTechnology18215226

  • DelateK.CwachD.ChaseC.2012Organic no-tillage system effects on soybean, corn and irrigated tomato production and economic performance in Iowa, USARenew. Agr. Food Syst.274959

    • Search Google Scholar
    • Export Citation
  • Díaz-PérezJ.C.SilvoyJ.PhatakS.RubersonJ.MorseR.2008Effect of winter cover crops and no-till on the yield of organically-grown bell pepper (Capsicum annuum L.). In: R. Prange and S. Bishop (eds.). Proc. XXVII IHC-S11 Sustainability through integrated and organic horticulture. Acta. Hort. 767:243–247

  • EdwardsW.2015Estimating farm machinery costs. 6 Oct. 2015. <https://www.extension.iastate.edu/agdm/crops/html/a3-29.html>.

  • GaskellM.SmithR.2007Nitrogen sources for organic vegetable cropsHortTechnology17431441

  • HadasA.Bar-YosefB.DavidovS.SoferM.1983Effect of pelleting, temperature, and soil type on mineral nitrogen release from poultry and dairy manuresSoil Sci. Soc. Amer. J.4711291133

    • Search Google Scholar
    • Export Citation
  • HaramotoE.R.BrainardD.C.2012Strip tillage and oat cover crops increase soil moisture and influence N mineralization patterns in cabbageHortScience4715961602

    • Search Google Scholar
    • Export Citation
  • HartzT.K.HochmuthG.J.1996Fertility management of drip-irrigated vegetablesHortTechnology6168172

  • JohnsonM.D.LoweryB.1985Effect of three conservation tillage practices on soil temperature and thermal propertiesSoil Sci. Soc. Amer. J.4915471552

    • Search Google Scholar
    • Export Citation
  • JonesJ.J.B.CaseV.W.1990Sampling handling and analyzing plant tissue samples p. 389–427. In: R.L. Westerman (ed.). Soil testing and plant analysis. Soil Sci. Soc. Amer. Madison WI

  • LeavittM.J.SheafferC.C.WyseD.L.AllanD.L.2011Rolled winter rye and hairy vetch cover crops lower weed density but reduce vegetable yields in no-tillage organic productionHortScience46387395

    • Search Google Scholar
    • Export Citation
  • LichtM.A.Al-KaisiM.2005Strip-tillage effect on seedbed soil temperature and other soil physical propertiesSoil Tillage Res.80233249

  • LounsburyN.P.WeilR.R.2015No-till seeded spinach after winterkilled cover crops in an organic production systemRenewable Agr. Food Systems30473485

    • Search Google Scholar
    • Export Citation
  • LunaJ.M.StabenL.2002Strip tillage for sweet corn production: Yield and economic returnHortScience3710401044

  • MirskyS.B.RyanM.R.TeasdaleJ.R.CurranW.S.Reberg-HortonC.S.SpargoJ.T.WellsM.S.KeeneC.L.MoyerJ.W.2013Overcoming weed management challenges in cover crop-based organic rotational no-till soybean production in the eastern United StatesWeed Technol.27193203

    • Search Google Scholar
    • Export Citation
  • MochizukiM.J.RangarajanA.BellinderR.R.van EsH.M.BjörkmanT.2008Rye mulch management affects short-term indicators of soil quality in the transition to conservation tillage for cabbageHortScience43862867

    • Search Google Scholar
    • Export Citation
  • NairA.TillmanJ.CoolongT.2015Conservation techniques for vegetable production: Combining strip tillage and cover crops. Iowa State Ext. Outreach HORT3030

  • NyborgM.MalhiS.S.1989Effect of zero and conventional tillage on barley yield and nitrate nitrogen content, moisture and temperature of soil in north-central AlbertaSoil Tillage Res.1519

    • Search Google Scholar
    • Export Citation
  • PeacheyR.E.WilliamR.D.Mallory-SmithC.2004Effect of no-till or conventional planting and cover crops residues on weed emergence in vegetable row cropWeed Technol.1810231030

    • Search Google Scholar
    • Export Citation
  • PieperJ.R.AmadorJ.A.BrownR.N.2015Effects of three conservation tillage strategies on yields and soil health in a mixed vegetable production systemHortScience5017701776

    • Search Google Scholar
    • Export Citation
  • PlastinaA.EdwardsE.JohannsA.M.2015Cash rental rates for Iowa 2015 survey. 11 Jan. 2016. <https://www.extension.iastate.edu/agdm/wholefarm/html/c2-10.html>.

  • RyanM.R.CurranW.S.GranthamA.M.HunsbergerL.K.MirskyS.B.MortensenD.A.NordE.A.WilsonD.O.2011Effects of seeding rate and poultry litter on weed suppression from a rolled cereal rye cover cropWeed Sci.59438444

    • Search Google Scholar
    • Export Citation
  • SchellenbergD.L.MorseR.D.WelbaumG.E.2009Organic broccoli production on transition soils: Comparing cover crops, tillage and sidedress NRenew. Agr. Food Syst.248591

    • Search Google Scholar
    • Export Citation
  • SchillingerW.F.KennedyA.C.YoungD.L.2007Eight years of annual no-till cropping in Washington’s winter wheat–summer fallow regionAgr. Ecosyst. Environ.120345358

    • Search Google Scholar
    • Export Citation
  • TeasdaleJ.R.MohlerC.L.2000The quantitative relationship between weed emergence and the physical properties of mulchesWeed Sci.48385392

    • Search Google Scholar
    • Export Citation
  • U.S. Department of Agriculture (USDA)2006United States standards for grades of Italian sprouting broccoli. Agr. Mktg. Serv. Washington DC

  • U.S. Department of Agriculture–Agricultural Marketing Service (USDA-AMS)2015National Fruit and Vegetable Organic Summary. Agr. Mktg. Serv. Washington DC

  • VollmerE.R.CreamerN.Reberg-HortonC.HoytG.2010Evaluating cover crop mulches for no-till organic production of onionsHortScience456170

    • Search Google Scholar
    • Export Citation
  • WellsM.S.Reberg-HortonS.C.SmithA.N.GrossmanJ.M.2013The reduction of plant-available nitrogen by cover crop mulches and subsequent effects on soybean performance and weed interferenceAgron. J.105539545

    • Search Google Scholar
    • Export Citation
  • WoodC.W.ReevesD.W.DuffieldR.R.EdmistenK.L.1992Field chlorophyll measurements for evaluation of corn nitrogen statusJ. Plant Nutr.15487500

    • Search Google Scholar
    • Export Citation

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