Resumen

SERRA, A.P. et al. Biomass production and N and P uptake by Pfaffia glomerata (Spreng.) Pedersen according to N and P levels under greenhouse conditions. Rev. bras. plantas med. [online]. 2011, vol.13, n.3, pp. 265-270. ISSN 1516-0572.  http://dx.doi.org/10.1590/S1516-05722011000300003.

With the aim of evaluating biomass production and N and P uptake by Pfaffia glomerata according to N and P levels, the present study was carried out in a greenhouse, using as substrate Oxisol collected at the layer 0 - 20 cm. Experimental design was completely randomized, with three replicates and treatments arranged in 5 x 5 factorial arrangement, with five N levels (0, 125, 250, 375 and 500 mg pot^-1) and five P levels (0, 125, 250, 375 and 500 mg pot^-1). The assessed parameters were plant height, shoot and root fresh and dry matter, and N and P levels in shoot and roots. Results evidenced an interactive effect of N and P for all studied variables, except for N and P levels in shoot and roots. Biomass production and N and P uptake by Pfaffia glomerata were influenced by the N and P levels used in the experiment, whereas the optimal productivity was obtained with N levels ranging between 42.9 and 346.01 mg pot^-1 and P levels between 72.02 and 500 mg pot^-1.

Palabras llave : medicinal plants; nitrogen fertilization; phosphorus fertilization.