Attainable yield and soil texture as drivers of Pre-Plant Nitrogen Test performance in Maize in the Argentinean Pampas

FLAVIO H. GUTIERREZ BOEM; GARCIA, FERNANDO O.; CORRENDO, ADRIÁN A.; FERNANDO SALVAGIOTTI

Baltimore

Congreso; ASA and CSSA Meeting; 2018

American Society of Agronomy - Crop Science Society of America

Correndo,A.A., F.H. Gutierrez Boem, F.O. García, F. Salvagiotti. 2018.Attainable yield and soil texture as drivers of Pre-Plant NitrogenTest performance in Maize in the Argentinean Pampas. ASA, CSSA, andCSA International Annual Meeting, 4-7 de noviembre, Baltimore, USA.Diagnostic tools for corn (Zea Mays L.) nitrogen (N) fertilization in Argentina are mainly based on soil testing. A review of 788 N fertilization trials in Argentina from both, published and unpublished sources, was carried out to explore the effects of (i) attainable yield and (ii) soil texture on the relationship between corn grain yield and soil N test. Data were split into five attainable yield classes and three soil textures (n = 15). For each group, quadratic-plateau models were fitted to the relations between grain yield and pre-plant N availability (PPN av ) (soil N at 0-60 cm depth + fertilizer N). Independently from the soil texture, a linear increment of 22 kg PPN av per Mg of attainable yield was registered for achieving yield plateaus from 8.7 to 14.2 Mg ha , with their respective PPN av thresholds from 168 to 288 kg ha . Additionally, the model showed poor performances (R < 0.2) for the lowest attainable yield group (less than 8.5 Mg-1 ha ) as compared to higher attainable yield groups (R up to 0.63). Regardless of the attainable yield, soil texturemainly affected the yield response to fertilizer N rate in the following order: clay > medium > coarse. These results may serve for addressing the variability of performance of the most widely used corn N fertilization model in Argentina.p { margin-bottom: 0cm; direction: ltr; color: rgb(0, 0, 0); }p.western { font-family: "Times New Roman", serif; font-size: 12pt; }p.cjk { font-family: "Times New Roman", serif; font-size: 12pt; }p.ctl { font-family: "Times New Roman", serif; font-size: 10pt; }a:link { color: rgb(0, 0, 255); text-decoration: none; }