Abstract:
Research of the Pb effect on the lettuces growth was done in Botanical Garden Department of
Biology, Mathematics and Sciences Faculty in Riau University on April-July 2010. The aim of this
research was to observe the effect of Pb(NO3)2 on the growth of the lettuces and the contents of
lead in lettuces. This research used Completely Randomized Design (CRD) with 5 treatments and
3 replications, namely giving aquades as control, and the treatments nutrient solution of Pb(NO3)2
at concentrations 25, 50, 100 and 200 ppm. After a week of planting of seedling at polibag,
nutrient solution of Pb(NO3)2 has given 100 ml once a week. The media was a mixture of top soil,
sand, chicken manure and compost with the proportion of 4:1:1:1. Data were analized using
ANOVA and test with DMRT at 5%. The observed parameters were plant height, root length, leaf
number and fresh weight of the plant. Contents the Pb in soil and lettuces were analyzed. The
result of the research showed that giving of Pb(NO3)2 until the highest concentration 200 ppm did
not inhibited the growth of the lettuces and the highest Pb concentration was found in the root than
in the shoot of lettuces.
