Magnetic fields produce physiologic changes in cell structure and thus can affect plant performance. On the other hand nanoparticles may bind with different cytoplasmic organelles and interfere with the metabolic processes at that site. In order to study the effect of silver nanoparticles and magnetic field on Carum copticum and its role in the reduce of water and fertilizer consumption, an experiment was conducted as split plot based on randomized complete block with three replications in Agricultural Research Center of Islamic Azad University, Birjand branch, Iran in 2010. Irrigation levels (control- once a week until the end of growth and water stress- once a week until the begin of flowering and after that every other week until the end of growth) were as main plot and soil fertilizing methods (control with no fertilizer, fertilizing with N-P-K based on soil analysis-F, using of magnetic band-M, using of silver nanoparticles - N, M+N and M+ N + 50% F) were as subplots. The results show water stress had not any significant effect on biomass and seed yield, seed and umbels number per plant and biomass WUE, but in water stress conditions 1000 seed weight, seed WUE and harvest index increased, significantly. Soil fertilizing method had significant effect on biomass and seed yield, umbels and seed number per plant and biomass and seed WUE. The use of base fertilizer (F) or magnetic band (M, M+N and M+N+50% F) caused the highest seed and biomass yield and their WUE, however silver nanoparticles had not any significant effect on these traits. Harvest index had not significantly affected by fertilizing method. Also, interaction of irrigation levels and soil fertilizing method was not significant on any measured traits. In conclusion, although making magnetic field could increased crop yield probably through nutrient uptake improvement, but it could not reduce water use in Carum copticum.

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