Nitrogen application during rhizoma peanut shoot emergence affects planting-year nitrogen fixation
Corresponding Author
Parmeshwor Aryal
Agronomy Department, University of Florida, Gainesville, FL, USA
Correspondence
Parmeshwor Aryal, Agronomy Department, University of Florida, Gainesville, FL 32611-0500, USA.
Email: [email protected]
Search for more papers by this authorLynn E. Sollenberger
Agronomy Department, University of Florida, Gainesville, FL, USA
Search for more papers by this authorJosé C. B. Dubeux Jr.
North Florida Research and Education Center, University of Florida, Marianna, FL, USA
Search for more papers by this authorCorresponding Author
Parmeshwor Aryal
Agronomy Department, University of Florida, Gainesville, FL, USA
Correspondence
Parmeshwor Aryal, Agronomy Department, University of Florida, Gainesville, FL 32611-0500, USA.
Email: [email protected]
Search for more papers by this authorLynn E. Sollenberger
Agronomy Department, University of Florida, Gainesville, FL, USA
Search for more papers by this authorJosé C. B. Dubeux Jr.
North Florida Research and Education Center, University of Florida, Marianna, FL, USA
Search for more papers by this authorAbstract
Rhizoma peanut (Arachis glabrata Benth.; RP) is an important perennial forage legume in the US Gulf Coast region, but it is vegetatively propagated from rhizomes and relatively slow to establish. There are reports that N fertilization enhances RP establishment, but other evidence suggests plant N content and establishment rate may not benefit. Understanding the effect of N fertilizer on RP biological N2 fixation will help elucidate this response. Our objective was to determine the effect of RP genotype and N fertilization during shoot emergence on N2 fixation and N accumulation during the year of planting. Replicated field experiments were conducted in adjoining fields; one was planted in 2016 and the other in 2017. Treatments were the factorial combinations of two RP entries (decumbent germplasm Ecoturf and upright cultivar ‘UF Tito’) and three N rates (0, 40, and 80 kg N ha−1 applied 10 wk after planting; 1% of total N as 15N) arranged in a randomized complete block design with four replications. Across N rates, upright cultivar UF Tito generally had greater N concentration and content in aboveground and belowground plant parts compared with decumbent germplasm Ecoturf. Nitrogen fertilization generally reduced the percentage of N derived from atmosphere and the amount of fixed N (BNF) during the year of planting, but it did not affect overall N concentration or content. These data suggest RP increased soil N uptake to compensate for reduced BNF following N fertilization, indicating starter N application had no measurable benefit for legume establishment under these conditions.
CONFLICT OF INTEREST STATEMENT
Authors declare no conflicts of interest.
Open Research
DATA AVAILABILITY STATEMENT
Research data are not shared.
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