100746 High-Yielding Soybean: Genetic Gain x Fertilizer Nitrogen Interaction.

Poster Number 333-1008

See more from this Division: C03 Crop Ecology, Management and Quality
See more from this Session: Div. C03 M.S. Poster Competition

Tuesday, November 8, 2016
Phoenix Convention Center North, Exhibit Hall CDE

Osler A. Ortez1, Fernando Salvagiotti2, Juan M. Enrico3, Eric A. Adee4 and Ignacio A. Ciampitti1, (1)Kansas State University, Manhattan, KS
(2)INTA - National Inst. of Agricultural Technology, Oliveros, Argentina
(3)INTA - National Inst. of Agricultural Technology, Oliveros, Argentina
(4)Kansas State University, Topeka, KS
Poster Presentation
  • OOrtez_Genetic Gain by N Fertilization.pdf (1.5 MB)
  • Abstract:
    The U.S. and Argentina account for more than 50% of the global soybean production. Soybean yields are determined by the genotype, environment and management practices (G x E x M) complex interaction. An unanswered scientific knowledge gap is still related to the ability of the biological nitrogen (N) fixation (BNF) process to satisfy soybean N demand at varying yield levels. The overall objective of this project is to study the contribution of N via utilization of varying N strategies under historical and modern soybean genotypes. Three field experiments were conducted during the 2015-16 seasons: Ottawa (East Central KS, US), Ashland Bottoms (Central KS, US) and Oliveros (Argentina, herein termed as ARG). Different soybean genotypes were utilized (1990’s = non-RR, 2000’s = RR-1 and 2010’s = RR-2) in US and a wide-variety of historical non-RR and modern RR-1 genotypes in ARG, all tested under three N management strategies (S1 = non-N applied, S2 = all N provided by fertilizer, and S3 = late-N applied). At Ottawa, the study was planted in an area without previous soybean history with yields ranging from 1.4 to 2.1 Mg ha-1. Modern genotype RR-2 increased 15% over the other varieties evaluated. As related to the N management approach, higher soybean yields occurred when N nutrition was based on S2 (10% increase). At Ashland Bottoms, yields ranged from 3.2 to 4.4 Mg ha-1, where the oldest genotype (non-RR) increased yield by 13% over the rest. There was not statistical significance between N management strategies at this location. For both US sites, it can be concluded that the field where soybean has not been previously planted (Ottawa) had a lower yield capacity compared to the site with a soybean history (Ashland). At ARG, seed yield ranged from 3.0 to 4.6 Mg ha-1, where modern cultivars (released after 2010) increased yield 34% over the rest. No interaction between release year and N fertilization strategy was observed. However, S2 increased seed yield by 5% over N fertilization strategies S1 and S3. In ARG, yield levels were similar to that in Central KS, but larger yields were observed with modern cultivars.

    See more from this Division: C03 Crop Ecology, Management and Quality
    See more from this Session: Div. C03 M.S. Poster Competition