This research aimed to study the biomass and nutrient distribution among the vegetative components of Heteranthera reniformis under the effect of different concentrations of N, P and K. The plants were cultivated in plastic pots filled with rolled stone, in nutrient solutions with 80% of the original concentration of Sarruge as the base solution. The experimental design was completely randomized, at 5 levels (0, 25, 50, 75% of the base solution) evaluated individually in N, P and K, besides the control (100% of the base solution), with 4 replicates in the period of 35 days. The largest leaf areas were verified in solutions to 75% of P and 50% of N and K. The solution up to 50% of N provided the largest dried biomass of the plants. The stem contribution to the allocation of resources presented results ranging from 55.5 to 74.5% in relation to the total dry matter regarding level 0 and 75% of N. Root contribution decreased with the increase of N, P and K concentrations. The greatest root contributions were in the absence of N (26.8%) and P (19.2%), which were higher in relation to their respective more concentrated levels. The contents of N, P and K corresponded to an increasing order in leaf, stem and roots, with the largest contents obtained in the range of 50 to 125 mg L-1 of N; 5 to 15 mg L-1 of P; and 100 to 150 mg L-1 of K.
aquatic plant; weed; growth; nutrients
