What would you choose for light intensity to grow potato plants in a growth room with the purpose of inoculation with Alternaria spps. ? And what kind of lamp would you choose ?
I think potatoes are happy with around 200 μmol m-2s-1. What I would also like to avoid is the plants getting too tall and thin because then the stems break off easily and handling is harder... Any recommendations would be highly appreciated!
It think 200 umol m-2s-1 it isn't enough. I won't recommend less than 500 m-2s-1 to growth any plant, if it is possible. If the plants get tall and thin correct your pot size and the N available to the plant.
It is a very good subject to set up a small treatment with 2 combinations (light intensity and time) or three combinations (light intensity, time and limp kinds) in different amounts for potato seedlings, to get your correct answer. Because sometimes answers can be changes even any controlled conditions you have to use. Good luck.
Minimum of 500-700 µmol m-2 s-1, which could be provided by 400W metal halide lamps (for example: Osram HQI-BT 400 W; Osram Ltd., St Helens, UK). Lower light intensity would lead to stretching your seedlings so avoid this by providing enough light intensity.
Good luck
Thank you all for your answers. I will go for the maximum light intensity possible in the available growth rooms. I will probably do a small screening experiment to see which intensity is best for my case. I will post the results here when available.
Conditions that result in tall and spindly growth usually relate to too much red light and not enough blue light , make sure that the light quality is there to meet the needs , this is just as important as light quantity , they are not the same thing
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