Abstract

GOLIK, S.I.  and  CHIDICHIMO, H. O.. Postanthesis root activity, removilisation and N absortion in wheat under two tillage systems and nitrogen fertilization. Agriscientia [online]. 2007, vol.24, n.1, pp.45-55. ISSN 1668-298X.

The objective of this work was to evaluate postanthesis root activity and N accumulation, removilisation and absorption under two tillage systems and three N fertilizer levels. The higher N accumulation under the conventional tillage resulted in a greater contribution of N to the grain (10,36 g m^{- 2} in 2002 and 10,19 g m^{- 2} in 2003) and a greater yield (485,78 g m^{- 2} in 2002 and 468,2 g m^{- 2} in 2003). No-tillage did not present differences with the conventional tillage in the postanthesis N absorbed, but in the remobilised N differences between two tillage systems were observed. The fertilization increased postanthesis N accumulated, N remobilised and N absorbed. Root dry matter decreased from anthesis towards maturity. However, its specific absortion rate of nitrogen (SARn) was remained but also increased during the last analyzed stage, which suggests that N accumulation in the grain not only came to the N remobilised but also postanthesis absorption was important. Root dry matter did not show relation with the absorption rate of nitrogen, but its SARn did. Cultivars presented differential behavior to the different analyzed treatments.

Keywords : Nitrogen; Root activity; Absortion; Removilisation.

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