Comparison of nitrogen fertilizer demand for wheat production between humid and semi-arid portions of the Argentinean Pampas using a mass balance method

Authors
Romano, Nicolás F.; Alvarez, Roberto; Bono, Alfredo A.; Steinbach, Haydee S.
Publication Year
2015
Language
English
Format
article
Status
Published version
Description
The Argentinean Pampa is an important grain production region in which nitrogen (N) availability restricts wheat (Triticum aestivum L.) yield. We performed 46 experiments in the Semi-arid Pampa for evaluating soil N supplying capacity using a mass balance approach. The information generated was combined with published results from 58 experiments performed in the Humid Pampa. Average rainfall was 50% lower under semi-arid conditions and soils had half of the clay + silt and total N contents than those of humid environments. Wheat yield under humid scenarios doubled the yield attained under semi-arid ones, and N and rainfall use efficiencies were also higher. A model could be fitted with good performance for estimating N-supplying capacity from mineral and organic soil pools (R2 = 0.53–0.93), absorbed N (R2 = 0.70) and yield (R2 = 0.57). This methodology can be used for estimating fertilizer needs under defined climate- and site-specific scenarios. For the average yields, rainfall and soil conditions of the experimental networks, targeted N supply (soil mineral + fertilizer N) was estimated as 160 kg N ha−1 in the Humid Pampa and 50 kg N ha−1 in the Semiarid Pampa. Current N rates applied by farmers need to be increased under humid conditions and overfertilization occurs under semi-arid ones.
Fil: Romano, Nicolás F.. Instituto Nacional de Tecnología Agropecuaria. Centro Regional la Pampa-San Luis. Estación Experimental Agropecuaria Anguil; Argentina
Fil: Alvarez, Roberto. Universidad de Buenos Aires. Facultad de Agronomia; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Bono, Alfredo A.. Instituto Nacional de Tecnología Agropecuaria. Centro Regional la Pampa-San Luis. Estación Experimental Agropecuaria Anguil; Argentina
Fil: Steinbach, Haydee S.. Universidad de Buenos Aires. Facultad de Agronomia; Argentina
Subject
Balance de nitrógeno
Trigo
Región Pampeana
Mineralización de nitrógeno
Agricultura
Agricultura, Silvicultura y Pesca
CIENCIAS AGRÍCOLAS
Access level
Restricted access
License
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repository
CONICET Digital (CONICET)
Institution
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identifier
oai:ri.conicet.gov.ar:11336/16194