TY  - JOUR 
T1  - Nitrate concentration in lettuce leaves depending on photosynthetic photon flux and nitrate concentration in the nutrient solution
JO  - Horticultura Brasileira
A1  - Cometti, Nilton Nélio
A1  - Martins, Madlles Q
A1  - Bremenkamp, Cintia Aparecida
A1  - Nunes, José Arcanjo
SN  - 0102-0536
UL  - 10.1590/S0102-05362011000400018
VL  - 29 
Y1  - 2011
PB  - Brasil 
ER  -