Chronically low nitrate treatment (0.04 mM, 15 days) reduced the biomass and changed the biomass partition in maize seedling (per plant).

Note: The mean of biomass (fresh or dry weight) along with its partition were determined based on at least 5 biological replicates. The significant level (one pair t test) of the difference of biomass (dry weight) between 0.04 mM and 4 mM nitrate treatments is 0.00025.