title: Response of tomato plant to ammonium and nitrate nutrition using the relative addition rate technique
abstract: Different N sources (NO3<sup>-</sup>, NH4<sup>+</sup>, or NH4NO3) at relative addition rate (RAR) of 0.25 day<sup>-1</sup> were supplied to tomato (Lycopersicom esculentum Mill.), a species sensitive to NH4<sup>+</sup> toxicity. At RAR 0.25 day<sup>-1</sup> growth reduction occurred by NH4<sup>+</sup> application, slightly. Tomato roots had a more efficient NH4<sup>+</sup> assimilation than shoots when N was supplied solely in the form of NH4<sup>+</sup>, and dominant amino acids in tomato were 
journal: Acta Horticulturae