Dr Paul Johnstone
BAppSci, Horticulture, Massey University, New Zealand
PhD, Plant Science, Massey University, New Zealand
Research Interests & Activities
Integrated mixed cropping systems and practices that deliver sustainable and profitable production outcomes - specialising in arable, vegetable and forage crops. Crop nutrient management in response to spatial and temporal nutrient availability. Links between soil management practices and crop performance.
University of California, Davis, USA
Cornell University, USA
Tasmanian Institute of Agriculture, Australia
Honours & Awards
Secretary, NZ Agronomy Society
Member, NZ Soil Science Society
Member, New Zealand Institute of Agriculture and Horticultural Sciences
Member, American Society of Agronomy
Member, Soil Science Society of America
Member, Crop Science Society of America
Chakwizira E, Johnstone P, Fletcher AL, Meenken ED, de Ruiter JM, Brown HE 2014. Effects of nitrogen rate on nitrate-nitrogen accumulation in forage kale and rape crops. Grass and Forage Science (in press).
Reid JB, Trolove SN, Tan Y, Johnstone PR 2013. Luxury uptake of magnesium by peas (Pisum sativum). Annals of Applied Biology 163: 151-164
Fletcher AL, Brown HE, Johnstone PR, de Ruiter JM, Zyskowski RF 2011. Making sense of yield trade-offs in a crop sequence: A New Zealand case study. Field Crops Research, 124(2): 149–156.
Li FY, Johnstone PR, Pearson A, Fletcher A, Jamieson PD, Brown HE, Zyskowski RF 2009. AmaizeN: A decision support system for optimising nitrogen management of maize. NJAS–Wageningen Journal of Life Science 57: 93–100.
Li FY, Jamieson PD, Johnstone PR, Pearson A 2009. Mechanisms of nitrogen limitation affecting maize growth: a comparison of different modelling hypotheses. Crop & Pasture Science 60: 738–752.
Hartz TK, Johnstone PR, Williams E, Smith R 2007. Establishing lettuce leaf nutrient optimum ranges through DRIS analysis. HortScience 42: 143–146.
Hartz TK, Johnstone PR 2006. Relationship between soil P availability and P loss potential in runoff and leaching. Communications in Soil Science and Plant Analysis 37: 1525–1536.