102331 Soybean Nodule Inhibition and Root Growth As Influenced By Nitrogen Source and Nitrogen Rate.

Poster Number 468-416

See more from this Division: SSSA Division: Soil Fertility and Plant Nutrition
See more from this Session: Fertilizer & Lime Responses 1

Wednesday, November 9, 2016
Phoenix Convention Center North, Exhibit Hall CDE

Brian Pieralisi1, Bobby R. Golden2, Jason Bond3, Justin McCoy4, Michael S. Cox5 and Don Cook3, (1)Mississippi State Delta Research Center, Greenville, MS
(2)Mississippi State University, Stoneville, MS
(3)Delta Research and Experiment Station, Stoneville, MS
(4)Mississippi State Delta Research Center, Leland, MS
(5)Department of Plant and Soil Sciences, Mississippi State University, Mississippi State, MS
Abstract:
Greenhouse studies were conducted in Stoneville, MS in 2016 to evaluate the influence of supplemental N fertilizer on nodule formation and root growth of soybean (Glycine max (L.) Merr.).  Greater below ground biomass was observed on silt-loam soils versus below ground biomass on clay soils directly correlating to all other root parameters.  N fertilizers additions resulted in approximately 19% below ground biomass reduction across soil textures when compared to soybean receiving no N (0 kg N ha -1).  However, soybean above ground biomass was observed to have no response to N fertilizer additions.  Soybean receiving N fertilization were observed to exhibit a decrease across all belowground experimental parameters when compared to soybean receiving no N (0 kg N ha -1).  N fertilizers additions were observed to result in a 52% decrease in mean number of nodules present.  N fertilizers utilizing ESN as the N source observed to exhibit a greater number of nodules than that of urea+NBPT as the N source.  Overall, N fertilizer additions negatively impacted root growth and nodulation resulting in a decrease across all experimental below ground parameters.

See more from this Division: SSSA Division: Soil Fertility and Plant Nutrition
See more from this Session: Fertilizer & Lime Responses 1