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Deficient, Adequate and Excess Nitrogen Levels Established in Hydroponics for Biotic and Abiotic Stress-Interaction Studies in Potato

Author:
Geary, B., Clark, J., Hopkins, B. G., Jolley, V. D.
Source:
Journal of plant nutrition 2015 v.38 no.1 pp. 41-50
ISSN:
1532-4087
Subject:
Solanum tuberosum, abiotic stress, biomass, dietary fiber, humidity, hydroponics, nitrogen, nutrients, plant health, potatoes, shoots, temperature
Abstract:
Application of mineral nutrients to improve plant health is critical to providing food and fiber. Potato (Solanum tuberosum L.) is among the most responsive species to N application but is susceptible to biotic and abiotic stresses. Nitrogen-stress relationships are generally evaluated indirectly during field fertility trials designed for collection of agronomic data. A controlled environment system would benefit understanding N nutrition-stress interactions. Environmental chamber hydroponics allows strict experimental control of temperature, humidity, light, etc. while maintaining specific N nutrition. Potatoes were grown at various N levels. Plant biomass had a curvilinear relationship with N supply, peaking at 80 mg N L ⁻¹. Root or shoot N regressed against solution N produced significant, predictable relationships (R ² > 0.98 for each). Such relationships provide a basis to conduct controlled N nutrition-abiotic-biotic stress studies that could delineate among stress factors. This work establishes the specific ranges of N needed to complete such research.
Agid:
1224233