Impacts of Nitrogen Rate and Landscape Position on Soils and Switchgrass Root Growth Parameters

Kumar, Sandeep; Lai, Liming; Kumar, Pardeep; Valentín Feliciano, Yashira Marie; Battaglia, Martín Leonardo; Hong, Chang Oh; Owens, Vance N.; Fike, John; Farris, Rodney; Galbraith, John

doi:10.2134/agronj2018.08.0483

Title: Impacts of Nitrogen Rate and Landscape Position on Soils and Switchgrass Root Growth Parameters

Journal Article · 28 February 2019 · Agronomy Journal

DOI: https://doi.org/10.2134/agronj2018.08.0483 · OSTI ID:2478552

Kumar, Sandeep ^[1]; Lai, Liming ^[1]; Kumar, Pardeep ^[2]; Valentín Feliciano, Yashira Marie ^[3]; Battaglia, Martín Leonardo ^[4]; Hong, Chang Oh ^[5]; Owens, Vance N. ^[6]; Fike, John ^[4]; Farris, Rodney ^[7]; Galbraith, John ^[4]

Dep. of Agronomy, Horticulture and Plant Science South Dakota State Univ. Brookings SD 57007
Dep. of Agronomy, Horticulture and Plant Science South Dakota State Univ. Brookings SD 57007, Dep. of Soil Science CSKHPKV Palampur 176062 India
Univ. of Puerto Rico Mayagüez 00682 Puerto Rico
Virginia Tech Blacksburg VA 24061
Dep. of Life Science and Environmental Biochemistry Pusan National Univ. Miryang 50463 Rep. of Korea
North Central Sun Grant Center South Dakota State Univ. Brookings SD 57007
Oklahoma Agricultural Experiment Station, Eastern Research Station Oklahoma State Univ. Haskell OK 74436

Core Ideas Nitrogen rate did not affect soil properties for Oklahoma, South Dakota, and Virginia. Landscape position affected soil properties under higher slope. Nitrogen rate affected root N, surface area, and weight for the total profile. Landscape position affected the root C and N. Switchgrass roots can increase C accumulation and reduce risk of N loss in soils. ABSTRACT Switchgrass ( Panicum virgatum L.) has been recognized as a potential bioenergy feedstock, and can positively impact soils and the environment. The experimental sites were established in 2008 at three locations with each in Oklahoma (OK), South Dakota (SD), and Virginia (VA) to assess the impacts of N fertilization rate (N rate; low, 0 kg ha ⁻¹ ; high, 112 kg ha ⁻¹ ) and landscape position (shoulder, backslope, and footslope) on select soil properties and root growth parameters. Data indicate that N rate did not affect soil bulk density (BD), pH, electrical conductivity (EC), soil organic carbon (SOC), and total nitrogen (TN) for any of five depths. Landscape position impacted some of these properties by depth, depending on location. The N rate influenced root weight (RW), root surface area (RSA), and root total nitrogen (RTN) for the total profile (0–100‐cm depth) depending on local site conditions. The landscape position impacted RW, root total carbon (RTC), and RTN for total profile according to different site conditions. The interactions of landscape position by N rate on switchgrass root parameters were significant. The findings in this study indicate that the root system of switchgrass could improve soils and increase C accumulation and reduce the risk of N loss to benefit the environment.

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Research Organization:: South Dakota State Univ., Brookings, SD (United States)

Sponsoring Organization:: USDOE; USDOE Office of Energy Efficiency and Renewable Energy (EERE)

Grant/Contract Number:: FC36-05GO85041

OSTI ID:: 2478552

Journal Information:: Agronomy Journal, Journal Name: Agronomy Journal Journal Issue: 3 Vol. 111; ISSN 0002-1962

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: United States

Language:: English

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