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Paspalum vaginatum Schwartz plants were grown under greenhouse conditions in a continuous-flow hydroponic culture, containing - NO or + NH or NH 4 NO 3 as nitrogen source. After 30 days, the size of aerial biomass and root system decreased significantly when plants were supplied with + NH as exclusive nitrogen source. Compared to - 3 NO treatment, reducing and non-reducing sugars were decreasing together with a significant increase in amino acids content. + NH -nutrition caused tillers to grow toward an orthogravitropic position (average angle of 68∞ with respect to the horizontal), and with -nutrition, tillers tended to become diagravitropic (average angle of 23∞). With NH 4 NO 3 all the parameters measured had values in between those of the other two sources. Thus, the morphologic differences among plants growing in - NO or + NH nutrition confirm the hypothesis

Plant architecture of Paspalum vaginatum schwartz modified by nitrate and ammonium nutrition