Neilsen, Gerry, Ph.D.

Research Scientist- Soil fertility and plant nutrition


Contact Information:

Highway 97
Box 5000
Summerland, British Columbia V0H 1Z0
Telephone: 250-494-6377
Fax: 250-494-0755
Email: gerry.neilsen@agr.gc.ca

Areas of Expertise:

  • Major and minor element nutrition of plants in intensive horticultural production systems, especially for temperate tree fruits and grapes. Investigations have included seasonal variation in fruit mineral concentration and the association between nutrition and harvest and post-harvest fruit quality. New methods have been developed to overcome inadequate Zn, Mg and K nutrition but also to overcome toxicities associated with soil acidification and B toxicity. The effects of orchard floor vegetation management, mulching and soil amendments on nutrient cycling, soil quality and tree performance have been assessed. Methods of reducing replant disorders via P-fertilization have been developed. Considerable effort has been placed on development of techniques to optimize plant and fruit nutrition via fertigation of nutrients including N, P, K, B and Zn with irrigation water while minimizing leaching losses to groundwater.

Current Projects:

  • Environmentally sustainable horticultural crop nutrition and soil management
  • Improving Crop Performance and Soil Quality with Mulches, Organic Amendments and Cover Crops.
  • Optimizing cultural management techniques to maximize harvest quality and post storage longevity of sweet cherry
  • Use of zeolite and other barriers to improve plant establishment and conserve water and nutrients applied by fertigation to wine grapes grown on sandy soils
  • Optimize management practices to decrease environmental risk and improve nutrient use efficiency within various and varying production systems.

Affiliations:

  • President-elect/president/past president Can. Soc. Soil Sci. 2006-2008
  • Member International Society of Soil Science
  • Member Pacific Society of Soil Science
  • Member American Society of Horticultural Science
  • Member International Society of Horticultural Science

Research Publications:

The links below lead to abstracts with access to full text.

2016

2015

2014

2013

2012

2011

2010

2009

Other Science Related Publications:

2016

  • Forge, T.A., Neilsen, D., Neilsen, G.H., Hannam, K.D., Randall, P., and Wambold, L. (2016). "Water-conserving mulch and micro-irrigation practices affect assemblages of nematodes parasitizing winegrape in the Okanagan Valley.", Canadian Journal of Plant Pathology. (Abstract)
  • Watson, T.T., Nelson, L.M., Neilsen, G.H., Neilsen, D., O'Gorman, D.T., and Forge, T.A. (2016). "Control of Pratylenchus penetrans on sweet cherry using organic soil amendments.", Canadian Journal of Plant Pathology. (Abstract)

2015

  • Forge, T.A., Neilsen, D., Neilsen, G.H., Hannam, K.D., Randall, P., and Wambold, L. (2015). "Water-conserving mulch and micro-irrigation practices affect assemblages of nematodes parasitizing wine grape in the Okanagan Valley.", Canadian Phytopathological Society BC. Regional Meetings, Abbotsford, BC, Canada, October 21, 2015. (Presentation)
  • Forge, T.A., Neilsen, D., Zebarth, B.J., Neilsen, G.H., Kenney, E., Hashimoto, N., and Watson, T.T. (2015). "Using compost amendmenets to enhance soil health and replant establishment of tree-fruit and berry crops.", 3rd International Symposium on Organic Matter Management and Compost Use in Horticulture, International Society for Horticultural Science, Murcia, Spain, April 20-24, 2015.
  • Neilsen, D., Neilsen, G.H., and Forge, T.A. (2015). "Irrigation and nutrient management in tree fruit production systems.", Apple and Pear Horticulture, WSU Fruit School, Wenatchee, WA, USA, November 17, 2015, Presentation. (Abstract)
  • Neilsen, D., Neilsen, G.H., and Forge, T.A. (2015). "Precision nutrient and water management for irrigated woody perennial crops.", AAFC Science Day, July 9, 2015. (Presentation)
  • Neilsen, D., Smith, C.A.S., Bourgeois, G., Qian, B., Cannon, A.J., Neilsen, G.H., and Losso, I. (2015). "Modelling Changing Suitability for Tree Fruits in Complex Terrain.", 10th International Symposium on Modelling in Fruit Research and Orchard Management, Montpellier, France, June 2-7, 2015. (Abstract)
  • Neilsen, D., Smith, C.A.S., Neilsen, G.H., and Forge, T.A. (2015). "Underlying Challenges and Issues in Adaptation Research.", Agriculture and Climate Change Adaptation Research Workshop, Kelowna, BC, December 10, 2015. (Abstract)
  • Watson, T.T., Nelson, L.M., Neilsen, D., Neilsen, G.H., O'Gorman, D.T., and Forge, T.A. (2015). "Control of Pratylenchus penetrans on sweet cherry using organic soil amendments.", Canadian Phytopathological Society BC. Regional Meetings, Abbotsford, BC, October 21, 2015. (Presentation)

2014

  • Fentabil, M., Nichol, C.F., Hannam, K.D., Neilsen, D., Forge, T.A., Neilsen, G.H., and Jones, M.D. (2014). "Nitrous oxide emissions from micro-irrigated grape and apple fields located in the semi-arid Okanagan region of British Columbia.", ASA, CSSA and SSSA International Annual Meeting 2014, Long Beach, CA, USA, November 2-5, 2014, Number 96-13. (Abstract)
  • Fentabil, M., Nichol, C.F., Hannam, K.D., Neilsen, D., Forge, T.A., and Neilsen, G.H. (2014). "Annual greenhouse gas fluxes in drip and microspray irrigated vineyards and orchards in the Okanagan Valley, British Columbia.", Annual meeting of the Canadian Soil Science Society, Banff, Alberta, Canada, May 4-7, 2014. (Abstract)
  • Forge, T.A., Neilsen, D., Hannam, K.D., Neilsen, G.H., Jones, M.J., and Nichol, C.F. (2014). "Root growth and development of nematode communities in a young Merlot grape (Vitis vinifera L.) vineyard: Influence of irrigation and organic amendments.", ASA, CSSA and SSSA International Annual Meeting 2014, Long Beach, CA, USA, November 2-5, 2014, Number 145-9. (Abstract)
  • Forge, T.A., Neilsen, D., and Neilsen, G.H. (2014). "PARC Research update-root zone ecology and management.", Cherry Notes Newsletter of the British Columbia Cherry Association(January), pp. 6-7.
  • Forge, T.A., Neilsen, D., and Neilsen, G.H. (2014). "PARC Research update-root zone ecology and management.", Cherry Notes Newsletter of the British Columbia Cherry Association(January), pp. 6-7. (Newsletter)
  • Forge, T.A., Neilsen, G.H., Broersma, K., and Neilsen, D. (2014). "Application of municipal biosolids alters the structure of nematode communities in rangeland soils in the southern interior of British Columbia.", Annual meeting of the Canadian Soil Science Society, Banff, Alberta, Canada, May 4-7, 2014. (Abstract)
  • Forge, T.A., Neilsen, G.H., Neilsen, D., and Hogue, E.J. (2014). "Assessing soil health for tree-fruit and vine crops.", 2013 Washington State Horticultural Association 109th Annual Meetings, Wenatchee, WA, USA, December 2-4, 2013.
  • Forge, T.A., Neilsen, G.H., and Neilsen, D. (2014). "Assessing soil health for tree fruit and vine crops.", 109th Annual Meeting, Wenatchee, WA, USA, pp. 329-334.
  • Hampson, C.R., Neilsen, D., Neilsen, G.H., and Forge, T.A. (2014). Report of cooperative regional project NC-140 / British Columbia: Improving economic and environmental sustainability in tree fruit production through changes in rootstock use. http://www.nc140.org/annualreports.html. (Report)
  • Hannam, K.D., Forge, T.A., Neilsen, G.H., Neilsen, D., Jones, M.D., and Nichol, C.K. (2014). "Implications of irrigation and soil amendment practices for soil nutrient dynamics and yield in a young Merlot grape (Vitis vinifera) vineyard.", 2014 CSSS Annual Meeting, Banff, Alberta, Canada. (Abstract)
  • Hannam, K.D., Jones, M.D., Neilsen, D., Midwood, A., Forge, T.A., Neilsen, G.H., and Millard, P. (2014). "Bicarbonates in irrigation water can alter the C13 signature and rate of soil respiration-evidence from a 10 year-old apple orchard in the Okanagan valley, British Columbia.", 2014 CSSS Annual Meeting, Banff, Alberta, Canada. (Abstract)
  • Hannam, K.D., Neilsen, G.H., Neilsen, D., Forge, T.A., Jones, M.J., Nichol, C.F., and Fentabil, M. (2014). "Soil nutrient dynamics and yield in a young Merlot grape (Vitis vinifera L.) vineyard; implications of irrigation and soil amendment practices.", ASA, CSSA and SSSA International Annual Meeting 2014, Long Beach, CA, USA, November 2-5, 2014, Number 139-8. (Abstract)
  • Hannam, K.D., Neilsen, G.H., and Forge, T.A. (2014). Effects of three years of Big Horn Natural Compost on soil properties, vine nutrient status, fruit quality and yield - Industry report to Big Horn Compost. (Report)
  • Lang, G., Blatt, S.E., Grant, J., Hoying, S., Ingels, C.A., Neilsen, D., Robinson, T., and Neilsen, G.H. (2014). "Innovative high density sweet cherry training systems: five years of comparative trials across North America.", 29th International Horticultural Congress Symposium on Physiology of Perennial Fruit Crops & Production Systems, Brisbane, Australia, August 2014, http://www.ihc2014.org/Abstract, pp. 56. (Abstract)
  • Neilsen, D., Neilsen, G.H., and Forge, T.A. (2014). "Dwarfing rootstocks and training systems affect initial growth, cropping and nutrition in Skeena sweet cherry.", 29th International Hort. Congress, Australia, http://www.ihc2014.org/Abstract, pp. 95. (Abstract)
  • Neilsen, G.H. and Neilsen, D. (2014). "Fertigation and nutrition of apple orchards. International Fruit Tree Association.", Compact Fruit Tree, 47(2), pp. 15-20.
  • Neilsen, G.H. and Neilsen, D. (2014). "Fertigation and nutrition of apple orchards.", Agropecuaria Catarinese, 27(2), pp. 34-43.
  • Neilsen, G.H. and Neilsen, D. (2014). "Fertigation and nutrition of apple orchards.", Agropecuaria Catarinese, 27(2), pp. 34-43.
  • Neilsen, G.H. and Neilsen, D. (2014). "Fertigation and nutrition of apple orchards.", Compact Fruit Tree, 47(2), pp. 15-20.
  • Neilsen, G.H. and Neilsen, D. (2014). "Sap flow monitoring to improve water and management strategies for sweet cherry (Prunus avium L.)", ASA, CSSA and SSSA International Annual Meeting 2014, Long Beach, CA, USA, November 2-5, 2014, Number 421-7. (Abstract)
  • Neilsen, G.H., Forge, T.A., and Neilsen, D. (2014). "Does organic matter matter?", 109th Annual Meeting, Wenatchee, WA, USA, pp. 314-321.
  • Neilsen, G.H., Forge, T.A., and Neilsen, D. (2014). "Does organic matter?", 2013 Washington State Horticultural Association 109th Annual Meetings, Wenatchee, WA, USA, December 2-4, 2013.

2013

  • Forge, T.A., Neilsen, G.H., Neilsen, D., O'Gorman, D.T., Hogue, E.J., Angers, D.A., and Bissonnette, N. (2013). "Organic orchard soil management practices affect soil biology and organic matter", II International symposium of organic matter management and compost use in horticulture III Workshop of bioproducts for agriculture and III Workshop of Ibero-american network for biological fertilizers for agriculture, Santiago, Chile, pp. 31.
  • Neilsen, D., Neilsen, G.H., Forge, T.A., and Cline, J.A. (2013). "The effects of crop load and water stress on yield and fruit quality of sweet cherry cultivars.", ASHS Annual Conference, HortSci. Supplement: S213. (Abstract)
  • Neilsen, D., Neilsen, G.H., and Forge, T.A. (2013). NC-140 BC 2013 State Report_Cherry., Canada: Okanagan Kootenay Cherry Growers' Association (OKCGA), BC, Canada. (Report)
  • Neilsen, D., Neilsen, G.H., and Forge, T.A. (2013). Report of cooperative regional project NC-140 / British Columbia: Improving economic and environmental sustainability in tree fruit production through changes in cherry rootstock use. http://www.nc140.org/annualreports.html. (Report)
  • Neilsen, G.H. and Neilsen, D. (2013). "Does the amount of crop on a tree affect sweet cherry fruit quality?", Cherry Notes: Newsletter of the Okanagan Kootenay Cherry Growers Association(June), pp. 2 pages.
  • Neilsen, G.H. and Neilsen, D. (2013). Annual report Okanagan Kootenay Cherry Growers Association (OKCGA). NC140 project and coping with drought, 13pp. (Report)
  • Neilsen, G.H. and Neilsen, D. (2013). Annual report Okanagan Kootenay Cherry Growers Association (OKCGA). NC140 project and coping with drought, Canada: Okanagan Kootenay Cherry Growers' Association (OKCGA), BC, Canada. (Report)
  • Neilsen, G.H., Forge, T.A., Neilsen, D., O'Gorman, D.T., and Bissonnette, N. (2013). "Soil and nutrient management in organic orchard production.", ASA/CSSA/SSSA International annual meeting, Tampa, Florida, USA, November 3-6, 2013, SSSA division soil fertility and plant nutrition, Abstract 133-9, pp. 103. (Abstract)
  • Neilsen, G.H., Hannam, K.D., and Hannam, K. (2013). Final J. R. Simplot research report. (Report)

2012

  • Thurston, M., Nelson, L.M., and Neilsen, G.H. (2012). "Comparison and screening of phosphate-solubilizing micro-organisms for plant growth promotion of apple seedlings.", Canadian Organic Science Conference and Organic Science Cluster Strategic Meetings, University of Manitoba, Winnipeg, MB, Canada, February 21-23, 2012, pp. 47.

2011

  • Forge, T.A., Neilsen, D., Neilsen, G.H., and Hogue, E.J. (2011). "Influences of organic mulches on development of root-lesion nematode populations in relation to indicators of soil food web structure during apple orchard establishment.", Canadian Journal of Plant Pathology, 33, pp. 276. (Abstract)
  • Forge, T.A., Neilsen, G.H., Neilsen, D., Walters, T.W., and Koch, C.A. (2011). "Using organic amendments and mulches to preferentially enhance biological activity and suppress plant pathogens in root zone soil under perennial fruit crops.", Soils Ecology Society Meeting 2011, University of British Columbia - Okanagan, Kelowna, BC, Canada, May 24-27, 2011.
  • Forge, T.A., Neilsen, G.H., Smit, R., Neilsen, D., Bowen, P.A., Hannam, K., and Hannam, K.D. (2011). "Nematode parasites of grapevines in the Okanagan Valley: What are their potential impacts? What can we do about them?", 12th Annual Enology & Viticulture Conference and Trade Show, Penticton, BC, Canada, July 18-19, 2011.
  • Hannam, K., Hannam, K.D., Neilsen, G.H., and Neilsen, D. (2011). "The concentrations of yeast assimiliable N in wine grape juice can be manipulated using deficit irrigation ,crop load reduction and nitrogen fertilization. 382-8 S08 Soil nutrient management and soil and plant analyses.", 2011 ASA-CSSA-SSSA International Annual Meeting: Fundamental for life: soil, crop and environmental sciences, San Antonio, TX, USA, October 16-19, 2011.
  • Hannam, K.D., Neilsen, G.H., Neilsen, D., and Forge, T.A. (2011). "Improving the yeast assimiliable nitrogen status of wine grape juice.", 12th Annual Enology & Viticulture Conference and Trade Show, Penticton, BC, Canada, July 18-19, 2011.
  • Neilsen, D., Losso, I., Guak, S., and Neilsen, G.H. (2011). "Development of chilling and forcing relationships for modeling spring phenology of apple and sweet cherry cultivars.", IX International Symposium on Modelling in Fruit Research and Orchard Management, Saint-Jean-sur-Richelieu, QC, Canada, June 19-23, 2011, pp. 40. (Abstract)
  • Neilsen, D., Neilsen, G.H., Forge, T.A., Guak, S., and Herbert, L.C. (2011). "Effects of irrigation stress and crop load on yield and quality of Ambrosia/M.9 apple trees.", HortScience, 46(9), pp. S115. (Abstract)
  • Neilsen, G.H. and O'Gorman, D.T. (2011). "Using nitrogen fertilizers to increase grape quality; Grapevine trunk diseases.", 2011 CCOVI Annual Lecture Series, Brock University, St. Catharines, ON, Canada, April 27, 2011. (Presentation)
  • Neilsen, G.H., Neilsen, D., Forge, T.A., Guak, S., and Herbert, L.C. (2011). "Irrigation strategy and crop load affect nutrition management of drip-fertigated Ambrosia/M.9 apple trees 359-2 S04 Soil fertility and plant nutrition.", 2011 ASA-CSSA-SSSA International Annual Meeting: Fundamental for life: soil, crop and environmental sciences, San Antonio, TX, USA, October 16-19, 2011, Session: Management strategies to improve nutrient use efficiency I.
  • Neilsen, G.H., Neilsen, D., Forge, T.A., Hannam, K., and Hannam, K.D. (2011). "Urea sprays to improve yeast assimiliable N concentration in grape at harvest.", 12th Annual Enology & Viticulture Conference and Trade Show, Penticton, BC, Canada, July 18-19, 2011.
  • Neilsen, G.H., Neilsen, D., and Toivonen, P.M.A. (2011). "NC-140-Sweet cherry training system /rootstock trial.", Cherry Notes: Newsletter of the Okanagan Kootenay Cherry Growers Association, 2011(June), pp. 10.

2009

  • Bissonnette, N., Angers, D.A., Neilsen, G.H., Neilsen, D., Hogue, E.J., and Forge, T.A. (2009). "Utilisation de residus de paillis organiques en production biologique de pommiers: effect sur la matiere organique du soil.", 23e Congrès annuel de l’Association Québécoise des Spécialistes en Science du Sol (AQSSS): La rivière, reflet de la gestion des terres, l'auberge le Baluchon, St-Paulin, QC, Canada, May 19-22, 2009, pp. 72.
  • Neilsen, D. and Neilsen, G.H. (2009). "Cherry nutrition: an overview of recent developments in response to changing cultivation practices.", 6th International Cherry Symposium, Renaca, Chile, November 15-19, 2009, pp. 15. (Abstract)
  • Neilsen, D. and Neilsen, G.H. (2009). "Nutritional effects on fruit quality for apple trees.", New York Fruit Quarterly, 17, pp. 21-24.
  • Neilsen, D. and Neilsen, G.H. (2009). "Nutritional effects on fruit quality for apple trees.", In-Depth Fruit School on Apple Mineral Nutrition, Cornell University Cooperative Extensions, Ballston Spa and Newark, NY, USA, March 24-25, 2009, pp. 1-9.
  • Neilsen, G.H., Neilsen, D., Bowen, P.A., Bogdanoff, C.P., Usher, K.B., Rabie, B., Herbert, L.C., and Losso, I. (2009). "Crop load and irrigation management. First year effects on nutrition, vigour, yield and quality of Merlot grapes.", 10th Annual Enology & Viticulture Conference and Trade Show, Penticton, BC, Canada, July 20-21, 2009.
  • Neilsen, G.H., Neilsen, D., Bowen, P.A., Herbert, L.C., Losso, I., and Rabie, B. (2009). "Nitrogen fertilizer for optimizing wine grape performance.", 7th Ontario Fruit and Vegetable Convention (OFVC 2009), Brock University, St. Catharines, ON, Canada, February 18-19, 2009, [CD ROM].
  • Neilsen, G.H., Neilsen, D., Herbert, L.C., Kuchta, S.L., and Rabie, B. (2009). "Fertigation and bitter pit management in apples.", 7th Ontario Fruit and Vegetable Convention (OFVC 2009), Brock University, St. Catharines, ON, Canada, February 18-19, 2009, [CD ROM].
  • Neilsen, G.H., Neilsen, D., Herbert, L.C., Losso, I., and Rabie, B. (2009). "Factors affecting within orchard variability of sweet cherry (Prunus avium L.).", 16th Annual International Plant Nutrition Colloquium (IPNC): Plant Nutrition for Sustainable Development and Global Health, Sacramento Convention Center, Sacramento, CA, USA, August 26-30, 2009.
  • Neilsen, G.H., Neilsen, D., Hogue, E.J., Herbert, L.C., Kuchta, S.L., Losso, I., and Rabie, B. (2009). "Nutrient and soil management. Tender soft fruits.", 7th Ontario Fruit and Vegetable Convention (OFVC 2009), Brock University, St. Catharines, ON, Canada, February 18-19, 2009, [CD ROM].
  • Neilsen, G.H., Neilsen, D., Hogue, E.J., Rabie, B., Herbert, L.C., Forge, T.A., Angers, D.A., and Bissonnette, N. (2009). "Use of composts in organic apple production.", 19th Annual National Compost Conference, Vancouver, BC, Canada, September 30-October 2, 2009.
  • Neilsen, G.H., Neilsen, D., Rabie, B., Herbert, L.C., and Losso, I. (2009). "Factors affecting within orchard variability of nutrition, yield and quality of sweet cherry (Prunus avium L.).", 40th Annual Horticultural Forum and Trade Show, Penticton, BC, Canada, November 12-13, 2009.
  • Neilsen, G.H., Neilsen, D., Toivonen, P.M.A., Herbert, L.C., Lannard, B.L., and Chung, L. (2009). Effect of Avail liquid fertilizer on apple tree P uptake and fruit quality., J.R. Simplot Company and Murphy Agro. (Report)
Date modified: