Materia seca nodular y nitrógeno acumulado en el cultivo de soja en función de la disponibilidad de agua y azufre, y del sistema de labranza (original) (raw)
Nodular dry matter (NDM) and accumulated nitrogen (AN) in a soybean crop were evaluated as a function of tillage system [no-tillage (NT) and conventional tillage(CT)] and sulfur (S) availability in two experiments carried out under irrigation (Ri) and rainfed conditions (Se). The experiment was carried out at Balcarce in the 2002-2003 growing season. The NDM, determined at R5 stage, was not affected by S fertilization (P>0.10) but was higher under NT in Se (P< 0.05). Under Ri NDM was higher under NT but this difference was not significant. The AN was not affected by S fertilization, and under rainfed conditions, it was significantly lower (P<0.05) under CT. The AN was positively related with NDM but the r 2 value was low (36%), suggesting that NDM was not the only factor regulating biological N 2-fixation.
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