Publications
Chapters in books n=10
Heung, B., Keys, K., Burton, D., and Lynch, D.H. 2021. Soils of the Atlantic provinces. Pp 481-499 In Digging into Canadian Soils; An Introduction to Soil Science. Canadian Society of Soil Science, Pinawa, Manitoba.
Lynch, D.H., and Smuckler, S. 2020. Soils as the basis of cultivated ecosystems. Pp 33-48 In Caldwell,C.D. and Wang, S. Introduction to Agroecology. Science Press and Springer Nature Singapore Ltd., Singapore.
Döring, T.F. and Lynch, D.H. 2018. Organic potato cultivation. In Wale, S. [Ed] Achieving Sustainable Cultivation of Potatoes. Volume 2; Production. Storage and crop protection. Burleigh Dodds Science Publishing, Cambridge, UK
(chapter commentary) Kevany K. and Lynch. D. 2016. Commentary—Urban agriculture and its role in transformational agriculture and gender equity: In France, R. [Ed] Integrated Urban Agriculture: Precedents, Practices, Prospects. University of British Columbia Press.
Lynch, D.H., Sumner J., and Martin R. C. 2014. Transforming recognition of the social, ecological and economic goods and services derived from organic agriculture in the Canadian context. Pp 347-366 InBellon, S. and Penvern, S. [Eds] Organic Farming; prototype for sustainable agricultures. New York: Springer Science+Business Media.
Lynch, D.H. 2014. Sustaining soil organic carbon, soil quality and soil health in organic field crop management systems. Pp 107-132 In Martin, R.C and MacRae, R. [Eds] Managing Energy, Nutrients and Pests in Organic Field Crops. CRC Press.
Woodley, A., Audette, Y., Fraser, T., Arcand, M., Voroney, P., Knight, D. and D. H. Lynch. 2014. Nitrogen and phosphorus fertility management in organic field crop production. Pp 59-106 In Martin, R.C and MacRae, R. [Eds] Managing Energy, Nutrients and Pests in Organic Field Crops. CRC Press.
MacRae, R., Lynch, D.H., and Martin, R.C. 2014. Will more organic food and farming solve food system problems? Part I Environment. Pp 307-332 In Martin, R.C and MacRae, R. [Eds] Managing Energy, Nutrients and Pests in Organic Field Crops. CRC Press.
MacRae, R., Lynch, D.H., and Martin, R.C. 2014. Will more organic food and farming solve food system problems? Part I Consumer, Economic and Community Issues. Pp 333-362 In Martin, R.C and MacRae, R. [Eds] Managing Energy, Nutrients and Pests in Organic Field Crops. CRC Press.
Lynch, D.H., Sharifi, M., Hammermeister, A. and Burton, D. 2012. Nitrogen management in organic potato production. Pp 209-231 In Zhongi H., R. P. Larkin and C. W. Honeycutt [Eds] Sustainable Potato Production: Global Case Studies. New York: Springer Science+Business Media.
Papers in Refereed Publications (n=67)
Bourgeois, B., Charles, A., Van Eerd, L.L., Tremblay, N., Lynch, D.H., Bourgeois, G., Bastien, M., Bélanger,V., Landry,C., and Vanasse, A. 2022. Interactive effects between cover crop management and the environment modulate benefits to cash crop yields: a meta-analysis. Can. J. Plant Sci. (in press)
Marshall, C.B, Burton, D.L., and Lynch, D.H. 2022. Cover crops improve some, but not all, soil health indicators in horticultural rotations. Can. J. Plant Sci. https://cdnsciencepub.com/doi/10.1139/CJPS-2021-0133
Marshall, C.B, Burton, D.L., Heung, B., and Lynch, D.H. 2021. Influence of cropping system and soil type on soil health. Can. J. Soil Sci. 101: 626–640 https://cdnsciencepub.com/doi/10.1139/cjss-2020-0150
Zhu, W., Caldwell, .D., Wang, S., Lynch, D and Hartt, C. 2021. A Sino-Canadian comparative study of experts’ perceptions towards agroecosystem health. Human Ecology, 49(1), 81-89 https://link.springer.com/article/10.1007%2Fs10745-021-00217-0
Mann, C., Lynch, D.H., Dukeshire, S., and Mills, A. 2021. Farmers’ perspectives on soil health in Maritime Canada. Agroecol. Sust. Food Systems. 45: 673-688. https://www.tandfonline.com/doi/abs/10.1080/21683565.2020.1866143?journalCode=wjsa21
Marshall, C.B., and Lynch, D.H. 2020. Soil microbial and macrofauna dynamics under different green manure termination methods. Appl. Soil Ecol. 148: 103505 https://www.sciencedirect.com/science/article/abs/pii/S0929139319305967
Schneider, Kimberley D., Joanne R. Thiessen Martens, Francis Zvomuya, D. Keith Reid, Tandra D. Fraser, Derek H. Lynch, Ivan P. O’Halloran, and Henry Wilson. 2019.. Options for improved phosphorus cycling and use in agriculture at the field and regional scales. J. Env. Quality 48:1247-1264
https://dl.sciencesocieties.org/publications/jeq/articles/48/5/1247
Fraser, T D., D. H. Lynch, I. P. O’Halloran, R. P. Voroney, M. H. Entz and K. E. Dunfield. 2019. Soil phosphorus bioavailability as influenced by long-term management and applied phosphorus source. Can. J. Soil Sci. 99: 292-304
https://www.nrcresearchpress.com/doi/full/10.1139/cjss-2018-0075#.XaOi-i0ZPRY
Thiessen Martens, Joanne R., Lynch, D.H., and Enyz, M. 2019. A survey of green manure productivity on dryland organic grain farms in the eastern prairie region of Canada. Can. J. Plant Sci. 99(5): 772-776 https://www.nrcresearchpress.com/doi/full/10.1139/cjps-2018-0311#.XaOjSy0ZPRY
Mann, C., Lynch, D.H., Fillmore, S., and Mills, A., 2019. Relationships between field management, soil health and microbial community composition. Appl. Soil Ecol. https://www.sciencedirect.com/science/article/pii/S0929139318314999
Sharifi, M., Lynch, D.H., Burton, D., Papadopoulos, Y., and Main, M. 2018. Quantifying the short-term contribution of switchgrass (Panicum virgatum L.) to soil carbon using 13C natural abundance technique in a sandy loam soil in Eastern Canada. Can J. Soil Sci. In Press.
Alam, M.Z., Lynch, D.H., Tremblay, G., Gillis-Madden R., and Vanasse, A. 2018. Optimizing combining green manures and pelletized manure for organic spring wheat production. Can J. Soil Sci. 98: 638-649.
http://www.nrcresearchpress.com/doi/abs/10.1139/cjss-2018-0049#.XBfEey3Mzyg
Marshall, C. B. and Lynch, D.H. 2018. No-till green manure termination influences soil organic carbon distribution and dynamics. Agronomy J. 110: 1-9.
https://dl.sciencesocieties.org/publications/aj/abstracts/0/0/agronj2018.01.0063
Schneider, K., Lynch, D., Bünemann, E. K., Voroney, P. 2017. Vegetative composition, AMF root colonization, and biological N fixation distinguish organic and conventional perennial forage systems. Agronomy Journal 109:1697-1706
https://dl.sciencesocieties.org/publications/aj/abstracts/109/4/1697
Schneider K. D., Voroney R. P., Lynch D. H., Oberson A., Frossard E., Bünemann E. K. 2017. Microbially-mediated P fluxes in calcareous soils as a function of water-extractable P. Soil Biology and Biochemistry 106:51-60 https://doi.org/10.1016/j.soilbio.2016.12.016
Eerpina, R., Boiteau, G., and Lynch, D.H. 2017. Collembola diet-switching in the presence of maize roots vary with species. Can. J. Soil Science 97:171-177 https://doi.org/10.1139/cjss-2016-0057
Fraser, T. D., Lynch D.H., Gaiero, J., and Dunfield, K. E. 2016. Quantification of bacterial non-specific avid (phoC) and alkaline (phoD) phosphatase genes in bulk and rhizosphere soil from organically managed soybean fields. Applied Soil Ecology 111.48-56
https://www.sciencedirect.com/science/article/pii/S0929139316306266
Schneider, K.D., Cade-Menun, B., Lynch, D.H., and Voroney R.P. 2016. Soil phosphorus forms from organic and conventional forage fields. Soil Science Society of America Journal. 80:328-340. https://dl.sciencesocieties.org/publications/sssaj/abstracts/80/2/328?search-result=1
Renkema, J., Cutler, G., Lynch, D., MacKenzie, K., and Walde, S. 2016. Organic mulches in highbush blueberries alter beetle (Coleoptera) community composition and improve functional group abundance and diversity. Agricultural and Forest Entomology. 18:119-127 http://onlinelibrary.wiley.com/doi/10.1111/afe.12144/full
Alam, M.Z., Lynch, D.H., Sharifi, M., Burton, D.L. and Hammermeister, A. 2015 The effect of green manure and organic amendments on potato yield, nitrogen uptake and soil mineral nitrogen. Biological Agriculture and Horticulture.DOI:10.1080/01448765.2015.1133319 http://www.tandfonline.com/doi/full/10.1080/01448765.2015.1133319
Schneider, K. D., Lynch, D.H., Dunfield, K., Khosla, K., Jansa, J. and Voroney, R.P. 2015. Farm system management affects community structure of arbuscular mycorrhizal fungi. Applied Soil Ecology 96:192-200. http://www.sciencedirect.com.ezproxy.library.dal.ca/science/article/pii/S0929139315300512
Fraser, T. D., Lynch D.H., Entz, M. H., Bent, E., and Dunfield, K. E. 2015. Soil bacterial phoD gene abundance and expression in response to applied phosphorus and long-term management. Soil Biology and Biochemistry 88:137-147 http://www.sciencedirect.com.ezproxy.library.dal.ca/science/article/pii/S0038071715001649
Fraser T., Lynch D. H., Entz M. H., Dunfield K. E. 2015. Linking alkaline phosphatase activity with bacterial phoD gene abundance in soil from a long-term management trial. Geoderma 257-258:115-122 http://www.sciencedirect.com.ezproxy.library.dal.ca/science/article/pii/S0016706114003838
Lynch, D.H. 2015*. Nutrient cycling and soil health in organic cropping systems - importance of management strategies and soil resilience. Sustainable Agriculture Research. 4:76-84 http://www.ccsenet.org/journal/index.php/sar/article/view/50128
*Invited article
Yiridoe, E. K., Chen, Q., Fry, R., Lynch, D., and Price, G. 2015. Cost analysis and lifecycle Environmental impacts of three value-added novel bioproducts: Processing and production. Natural Resources Research. 24:65-84 http://link.springer.com/article/10.1007/s11053-014-9237-9
Sharifi, M., Lynch, D.H., Hammermeister, A., Burton, D., and Messiga, A.J. 2014. Effect of green manure and supplemental fertility amendments on selected soil quality parameters in an organic potato rotation in Eastern Canada. Nutr. Cycl. Agroecosys. 100:135-146 http://link.springer.com.ezproxy.library.dal.ca/article/10.1007/s10705-014-9633-x
Wile, A., Burton, D. L., Sharifi, M., Lynch, D., Main, M. and Y. Papadopoulos. 2014. Effect of nitrogen fertilizer application rate on yield, methane and nitrous oxide emissions from switchgrass (Panicum virgatum L.) and reed canary grass (Phallaris arundinacea L.). Can. J. Soil Sci. 94:129-137 http://www.nrcresearchpress.com.ezproxy.library.dal.ca/doi/abs/10.4141/cjss2013-058#.V9Wh6Dtlvyg
Nimmo, J., Lynch, D.H., Owen, J. 2013. Quantification of nitrogen inputs from biological nitrogen fixation to whole farm nutrient budgets of two dairy farms in Atlantic Canada. Nutr. Cycl. Agroecosyst 96:93-105. http://link.springer.com.ezproxy.library.dal.ca/article/10.1007/s10705-013-9579-4
Dai, M., Bainard, L.D., Hamel, C., Gan, Y. Lynch, D. 2013. Impact of land use on arbuscular mycorrhizal fungal communities in rural Canada. Appl. Environ. Microbiol. 79: 6719-6729. http://aem.asm.org/content/79/21/6719.full
Main, M., Lynch, D.H., Voroney, R.P., Juurlink, S. 2013. Soil phosphorus effects on forage harvested and nitrogen fixation on Canadian organic dairy farms. Agron. J. 105:1-9. https://dl.sciencesocieties.org/publications/aj/abstracts/105/3/827?access=0&view=pdf
Renkema, J.M., Lynch, D.H., Cutler, G.C., MacKenzie, K., Walde, S.J. 2012. Ground and rove beetles (Coleoptera: Carabidae and Staphylinidae) are affected by mulches and weeds in highbush blueberries. Environmental Entomology 41(5):1097-1106. http://ee.oxfordjournals.org.ezproxy.library.dal.ca/content/ee/41/5/1097.full.pdf
Lynch D.H.*, Halberg N. and Bhatta, G.D. 2012. Environmental impacts of organic agriculture in temperate regions. CAB Reviews 7, No. 010: 1-17. http://www.cabi.org/cabreviews/search/?q=Environmental+impacts+of+organic+agriculture+in+temperate+regions.+
*Invited review article
Hobson D.W., Lynch D.H., Pruski K. and Hammermeister A.M. 2012. Fertility rate and timing effects on organic blackcurrant growth and yield during establishment. Acta Hort 1001:335-341. http://www.actahort.org.ezproxy.library.dal.ca/books/1001/1001_38.htm
Renkema, J.M., Lynch, D.H., Cutler, G.C., MacKenzie, K., Walde, S.J. 2012. Predation by Pterostichus melanarius (Illiger) (Coleoptera: Carabidae) on immature Rhagoletis mendax Curran (Diptera: Tephritidae) in semi-field and field conditions. Biological Control 60(1):46-53. http://www.sciencedirect.com/science/article/pii/S1049964411002908
Renkema, J.M., Lynch, D.H., Cutler, G.C., MacKenzie, K., Walde, S.J. 2012. Emergence of blueberry maggot flies (Diptera: Tephritidae) from mulches and soil at various depths. Environmental Entomology 41(2):370-376. http://ee.oxfordjournals.org.ezproxy.library.dal.ca/content/ee/41/2/370.full.pdf
Renkema, J.M., Walde, S.J., Lynch, D.H., Cutler, G.C., MacKenzie, K. 2012. Ground beetles (Carabidae) are affected by mulch in organic highbush blueberries. Acta Hort 933: 447-453. http://www.actahort.org.ezproxy.library.dal.ca/books/933/933_58.htm
Burlakoti, R. R., Lynch, D.H., Halde, C., Beach, T., Dahal, S., and Debnath, S. C. 2012. Organic agriculture project in Nepal: An international twinning partnership program initiative. Can J. Plant Sci. 92:997-1003. http://www.nrcresearchpress.com.ezproxy.library.dal.ca/doi/abs/10.4141/cjps2011-198#.V9WmDDtlvyg
Lynch, D.H.*, MacRae, R.J. and Martin, R.C. 2011. The carbon and global warming potential impacts of organic farming: does it have a significant role in an energy constrained world? Sustainability 3: 322-362. http://www.mdpi.com/2071-1050/3/2/322
*Best review paper award in journal Sustainability in year of publication. Invited review article.
Nelson, K.L., Boiteau, G., Lynch, D.H., Peters , R.D. and Fillmore, S. 2011. Influence of agricultural soils on the growth and reproduction of the bio-indicator Folsomia candida. Pedobiologica 54:79-86. http://www.sciencedirect.com/science/article/pii/S0031405610000892
Renkema, J.M., Cutler, G.C., Lynch, D.H., MacKenzie, K., and Walde, S.J.. 2011. Mulch type and moisture level affect pupation depth of blueberry maggot (Diptera: Tephritidae) in the laboratory. J. Pest Science 84 (3): 281-287. http://link.springer.com/article/10.1007/s10340-011-0365-2
Bhatta, G.D., and Lynch, D. 2011. Sustainable soil management practices and farmers livelihoods: A spatial perspective. Elixir Agriculture 37:3825-3831. http://www.elixirpublishers.com/index.php?route=articles/category&path=346_320&page=10
Bhatta, G.D., Doppler, W. and Lynch, D. 2011. Livelihood strategies of farm families: micro-level modeling using Generalized Algebraic Modeling System (GAMS). Nepalese Journal of Agricultural Sciences 9, ISSN 2091-042X.
Boiteau, G., Lynch, D.H., and MacKinley, P. 2011. Avoidance tests with Folsomia candida for the assessment of copper contamination in agricultural soils. Environmental Pollution 159:903-6. http://www.sciencedirect.com.ezproxy.library.dal.ca/science/article/pii/S0269749110005890
Arcand, M.M., Lynch, D.H., Voroney, R.P., van Straaten, P. 2010. Residues from a buckwheat (Fagopyrum esculentum) green manure crop grown with phosphate rocks influence soil phosphorus dynamics. Can. J. Soil. Sci. 90: 257-266. http://www.nrcresearchpress.com.ezproxy.library.dal.ca/doi/abs/10.4141/CJSS09023#.V9WZJTtlvyg
MacRae, R.J., Lynch, D.H. and Martin, R.C. 2010. Improving energy efficiency and GHG mitigation potentials in Canadian organic farming systems. J. Sust. Ag. 34:549-580. http://www.tandfonline.com.ezproxy.library.dal.ca/doi/full/10.1080/10440046.2010.484704
Burkhard, N.E., Lynch, D.H., and Percival, D. C. 2010. Effects of pine-needle and compost mulches and weeds on nitrogen dynamics in an organically-managed highbush blueberry field. Acta Hort. 873:253-259. http://www.actahort.org.ezproxy.library.dal.ca/books/873/873_27.htm
Nelson, K.L., Lynch, D.H., and Boiteau, G. 2009. Assessment of changes in soil health throughout organic potato rotation sequences. Agric. Ecosys. Environ. 131:220-228. http://www.sciencedirect.com.ezproxy.library.dal.ca/science/article/pii/S0167880909000322
Lynch, D.H.* 2009. Environmental impacts of organic agriculture: A Canadian perspective. Can. J. Plant Sci. 89:621-628. http://www.nrcresearchpress.com.ezproxy.library.dal.ca/doi/abs/10.4141/CJPS08165#.V9WbETtlvyg
*Awarded Best paper in CJPS in 2009 by the Canadian Society of Horticultural Science.
Sharifi, M., Lynch, D.H., Zebarth, B.J., Zheng, Z., and Martin, R.C. 2009. Evaluation of nitrogen supply rate measured by in situ placement of Plant Root Simulator probes as a predictor of nitrogen supply from soil and organic amendments in potato crop. Am. J. Potato Res. 86:356–366. http://link.springer.com.ezproxy.library.dal.ca/article/10.1007/s12230-009-9090-2
Klimaszewski, J., Lynch, D., Majka, C.G., Renkema, J., Savard, K. and Hlavá, P. 2009. Pella glooscapi, a new species (Coleoptera, Staphylinidae), and new record of aleocharine beetles from Nova Scotia, Canada. In: Majka C.G., Klimaszewski J. (Eds) Biodiversity, Biosystematics, and Ecology of Canadian Coleoptera II. ZooKeys 22: 35-44. http://zookeys.pensoft.net/articles.php?id=2068
Burkhard, N.E., Lynch, D.H., Percival, D. C., and Sharifi, M. 2009. Organic mulch impact on vegetation dynamics and productivity of highbush blueberry under organic production. Hortscience 44(3):1-9. http://hortsci.ashspublications.org/content/44/3/688.full
Roberts, C. J., Lynch, D.H., Voroney, R.P., Martin, R. C. and Juurlink, S. D. 2008. Nutrient budgets of Ontario organic dairy farms. Can. J. Soil Sci. 88:107-114. http://www.nrcresearchpress.com.ezproxy.library.dal.ca/doi/abs/10.4141/S06-056#.V9WZ2Dtlvyg
Lynch, D.H., Zheng, Z., Zebarth, B.J. and Martin, R.C. 2008. Organic amendment effects on tuber yield, plant N uptake and soil mineral N under organic potato production. Renew. Agric. Food Sys. 23:250-259. https://www-cambridge-org.ezproxy.library.dal.ca/core/journals/renewable-agriculture-and-food-systems/article/organic-amendment-effects-on-tuber-yield-plant-n-uptake-and-soil-mineral-n-under-organic-potato-production/C5DF046FA88B39F679DEABF04D82E667
Boiteau, G., Lynch, D.H., and Martin, R.C. 2008. Influence of fertilization on the Colorado potato beetle, Leptinotarsa decemlineata (Say), in organic potato production. Envir. Ent. 37(2): 575-585. http://ee.oxfordjournals.org/content/ee/37/2/575.full.pdf
Martin, R.C. Lynch, D.H., Frick, B and VanStraaten, P. 2007. Phosphorous status on Canadian organic farms. J. of the Sci. of Food and Agriculture 87:2737-2740. http://onlinelibrary.wiley.com.ezproxy.library.dal.ca/doi/10.1002/jsfa.3077/abstract
Arcand, M.M., Lynch, D.H., Voroney, R.P., and van Straaten, P. 2006. Improving green manure quality with phosphate rocks in Ontario Canada. Aspects of Applied Biology 79:283-287. http://www.aab.org.uk/contentok.php?id=378
Cooper, A. Jeliazkov, V. D., Rathgeber, B. and Lynch. D.H. 2006. Evaluation of Pb and Cu bioavailability from compost amended soils. Can. J. Plant Sci. 86:1419 -1420 http://www.nrcresearchpress.com.ezproxy.library.dal.ca/doi/pdf/10.4141/P06-siabstracts
Sturz, A.V., Lynch, D.H., Martin, R.C., and Driscoll, A.M. 2006. Influence of compost tea, powdered kelp and Manzate 7 75 on the community composition and antibiosis against Phytophthora infestans of bacteria in the potato phylloplane. Can. J. Plant Pathology 28:52-62. http://www.tandfonline.com.ezproxy.library.dal.ca/doi/abs/10.1080/07060660609507270
Lynch, D.H., Voroney, R.P., and Warman, P.R. 2006. Use of 13C and 15N natural abundance techniques to characterize carbon and nitrogen dynamics in composting and in compost-amended soils. Soil Biol. Biochem. , 38:103-114. http://www.sciencedirect.com.ezproxy.library.dal.ca/science/article/pii/S0038071705001781
Lynch, D.H., Voroney, R.P., and Warman, P.R. 2005. Soil physical properties and organic matter fractions under forages receiving composts, manure or fertilizer. Compost Science and Utilization, 13:252-261. http://www.tandfonline.com/doi/abs/10.1080/1065657X.2005.10702249
Lynch, D.H., Cohen, R., Fredeen, A., Patterson, G., and Martin, R.C. 2005. Management of Canadian Prairie region grazed grasslands: Soil C sequestration, livestock productivity and profitability. Can. Journal Soil Sci., 85:183-192. http://www.nrcresearchpress.com.ezproxy.library.dal.ca/doi/abs/10.4141/S04-053#.V9WZdjtlvyg
Lynch, D.H., Voroney, R.P., and Warman, P.R. 2004. Nitrogen availability from composts for humid region perennial grass and legume-grass forage production. Journal of Environmental Quality, 33:1509-1520. http://search.proquest.com.ezproxy.library.dal.ca/docview/197399735?accountid=10406
Lynch, D.H., Jannasch, R.W., Martin, R.C., and Fredeen, A.H. 2003. Improving the nutrient status of a commercial dairy farm; An integrated approach. American Journal of Alternative Agriculture, 18:137-145. https://www.cambridge.org/core/journals/american-journal-of-alternative-agriculture/article/improving-the-nutrient-status-of-a-commercial-dairy-farm-an-integrated-approach/26C820054DD369FC6F5338DD552A9FE5
Zhang, F., Lynch, D.H., and Smith, D.L. 1995. Impact of low root temperatures in soybean [Glycine max (L.) Merr.] on nodulation and nitrogen fixation. Environmental and Experimental Botany 35:279-285. http://www.sciencedirect.com.ezproxy.library.dal.ca/science/article/pii/0098847295000177
Lynch, D.H., and Smith, D.L. 1994. The effects of low root-zone temperature stress on two soybean (Glycine max) genotypes when combined with Bradyrhizobium strains of varying geographic origin. Physiologia Plantarum 90:105-113. http://onlinelibrary.wiley.com.ezproxy.library.dal.ca/doi/10.1111/j.1399-3054.1994.tb02199.x/abstract
Lynch, D.H., and Smith, D.L. 1993. Soybean (Glycine max) nodulation and N2-fixation as affected by exposure to a low root-zone temperature. Physiologia Plantarum 88:212-220. http://onlinelibrary.wiley.com.ezproxy.library.dal.ca/doi/10.1111/j.1399-3054.1993.tb05491.x/abstract
Lynch, D.H., and Smith, D.L. 1993. Early seedling and seasonal N2-fixing symbiotic activity of two soybean [Glycine max (L.) Merr.] cultivars inoculated with Bradyrhizobium strains of diverse origin. Plant and Soil 157:289-303. http://link.springer.com.ezproxy.library.dal.ca/article/10.1007/BF00011057