Characterization of Nitrogen Fixation in US Soybean Systems
IPNI-2016-USA-KS43
PROJECT JUSTIFICATION AND RATIONALE Soybean production heavily depends on the total nitrogen (N) uptake primarily supplied via biological N fixation (BNF) process. From a recent review summary performed by Dr. Ciampitti, a strong connection was documented between plant N demand and final yield for soybeans. For example, a 70 bu/ac soybean needed a total N uptake (aboveground only) of approximately 320 lbs/ac. Read more
Interpretive Summary
| 2017 | The demand for nitrogen (N) in modern soybean production can be exceptionally high. A soybean crop that yields 70 bu/A may take up 320 lb N/A, with half accumulated after full-pod stage (R4). The primary sources of N for soybean are biological N fixation (BNF) and inorganic soil N. Fifty to 60% of plant N may be derived from BNF, which declines with increasing mineral N in the soil. |
| 2016 | Nitrogen (N) demands in modern soybean production can be exceptionally high. For example, one report stated that a 70 bu/A soybean crop takes up an aboveground total of around 320 lb N/A and approximately 50% of that is accumulated later in the season, after full-pod or R4 stage. The primary sources of N for soybean are biological N fixation (BNF) and inorganic soil N. One published report indicated that on average about 50 to 60% of required N comes from BNF. |
Updates & Reports
| 2016 | 2016 Annual Report |
| 2016 | Project Description |
Project Leader
Ignacio Ciampitti, Kansas State University
Project Cooperators
None
IPNI Staff
Location
Americas \ Northern America \ USA \ Kansas