Switchgrass nitrogen fertility response and nutrient cycling in a hay system

Ashworth, Amanda J.; Moore, P.; King, R.; Pote, D. H.; Douglas, J. L.; Jacobs, Alayna

doi:10.1002/agj2.20156

Cited by 6 publications

(12 citation statements)

References 23 publications

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“…Forage mass was greatest for orchardgrass fertilized with poultry litter; however, it did not differ from the non-fertilized native grass mix, with the fertilized native grass mix and the non-fertilized orchardgrass being lowest. Therefore, poultry litter applications did not increase C 4 forage species yields as it did with the C 3 orchardgrass; which is likely owing to native warm-season grasses not having a high nutrient requirement 19 , 20 . Poultry litter applications for both forages resulted in the greatest N removal and P content.…”

Section: Discussionmentioning

confidence: 89%

“…Poultry litter fertilizer applications did not affect animal grazing spatially, likely owing to nominal rates being applied with roughly only 50% N in poultry litter being plant available in year 1 20 . Finally, across all years, grazing frequencies were greatest during weeks 6 and 7, perhaps owing to increased dietary reproduction needs and less overall forage mass available, thus requiring more grazing to obtain adequate nutrition (particularly for the C 4 mix).…”

Section: Discussionmentioning

confidence: 99%

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Spatial monitoring technologies for coupling the soil plant water animal nexus

Ashworth¹,

Kharel

Sauer

et al. 2022

Sci Rep

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Systems-level studies aimed at determining how soil properties are linked to plant production and ultimately animal response spatially are lacking. This study aims to identify if grazing pressure is linked to soil properties, terrain attributes, and above-ground plant accumulation and nutritive value in a silvopastoral (or integrated tree-livestock) system. Overall, cattle prefer grazing native grasses (2.81 vs. 1.24 h ha−1 AU−1) and udic (dry) landscape positions compared to aquic (wet) areas (2.07 vs. 1.60 h ha−1 AU−1). Greater grazing frequency occurs in udic soils with greater phosphorus and potassium contents and with accumulated forage with less lignin (P ≤ 0.05), which correspond to reduced elevation and greater tree height and diameter (shade) during summer mob grazing. Combining spatial monitoring technologies (both soil and animal) with forage allowance can optimize grazing systems management and sustainability spatially and temporally.

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Section: Discussionmentioning

confidence: 89%

Section: Discussionmentioning

confidence: 99%

Spatial monitoring technologies for coupling the soil plant water animal nexus

Ashworth¹,

Kharel

Sauer

et al. 2022

Sci Rep

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“…A large component of the tall fescue in the NH 4 NO 3 plots died in Year 6, which may have been due to Al toxicity, as these plots had much lower pH values and high exchangeable Al compared with controls or plots fertilized with poultry litter (Moore & Edwards, 2005). Authors hypothesized that high levels of Al likely interfered with P uptake or translocation in the plants via aluminum phosphate precipitation in the roots (Ashworth et al., 2020). Volunteer bermudagrass ( Cynodon dactylon L.) encroached tall fescue in the NH 4 NO 3 plots in Year 6 (Moore & Edwards, 2005), with further encroachment by crabgrass ( Digitaria sanguinalis L.) occurring the last few study years, which may have contributed to greater P uptake and growth towards the end of the experiment.…”

Section: Resultsmentioning

confidence: 99%

Twenty‐year phosphorus trends in forage systems receiving aluminum sulfate‐treated poultry litter

Ashworth

Moore

Bacon³

et al. 2022

Agronomy Journal

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Adding aluminum sulfate or alum to poultry litter is a best management practice (BMP) that reduces ammonia emissions and P runoff and leaching, although its longterm effects on forage growth and P uptake are largely unknown. The objective was to determine if reducing soluble P in litter with alum would result in forage P deficiencies or reduce yields. A 20-yr study was conducted to determine effects of four rates of alum-treated litter, untreated litter, and ammonium nitrate (NH 4 NO 3 ), as well as an unfertilized control on tall fescue (Festuca arundinacea Schreb.) yield and P uptake. Phosphorus uptake increased as litter rates increased for both sources but was greater (P ≤ .05) for untreated litter, likely owing to high water-extractable P in soil. Over 20 yr, both litter sources had greater P uptake than NH 4 NO 3 . Average annual yields by fertilizer source across rates were 6.92, 6.64, 5.10, and 3.38 Mg ha -1 for alum-treated litter, untreated litter, NH 4 NO 3 , and the control, respectively. Forage yields increased with litter application rate, but there was no difference due to litter source, whereas yields were 34% lower with NH 4 NO 3 due to soil acidification and forage P deficiency (≤0.2% P). Multiple regression indicated tall fescue P uptake was affected by total P application rate and water-extractable phosphorus (WEP), whereas yields were influenced by N rates, Mehlich III P levels, soil pH, and precipitation. These results indicate that amending soils with alum-treated litter does not adversely affect tall fescue yields or P utilization, therefore alum is a sustainable BMP in pasture systems.

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“…The NWSG, in contrast to the aforementioned introduced species, have been considered to have relatively low nutrient requirements for productivity [20][21][22]. Regardless, soil fertility and harvest management can exert a strong influence on forage productivity, as well as the nutritive value of NWSG [23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Native Warm-Season Grass Response to Nitrogen Fertilization

Bisangwa,

Richwine,

Keyser

et al. 2024

Agronomy

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The identification of appropriate nitrogen (N) rates for native warm-season grasses (NWSG) is needed to inform forage management in the southeastern United States. Experiments were conducted in Knoxville and Springfield, TN, from 2015 to 2019, to evaluate dry matter (DM) yield, forage nutritive value (FNV), the influence of temperature and precipitation on yield, and partial factor productivity (PFP) responses. Three NWSG species (big bluestem [BB; Andropogon gerardii Vitman], switchgrass [SG; Panicum virgatum L.], and eastern gamagrass [EG; Tripsacum dactyloides L.]) were grown at each location and harvested twice annually. Five N rates in the form of urea were applied annually in split applications. The yields for all species responded positively to nitrogen (p < 0.001) and the time of harvest (p < 0.001) at both sites, except for BB yield at Springfield; no consistent N effects were observed over years. Nitrogen affected the FNV (p < 0.001) of all species, increasing CP by three to five percentage points (p < 0.001). Yields across all species and locations responded positively to precipitation (p < 0.001) and temperature (p < 0.001). A moderate N amendment (<135 kg N ha−1 yr−1, based on PFP) can enhance the productivity of NWSG, but responses were site-dependent and influenced by temperature and precipitation.

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Switchgrass nitrogen fertility response and nutrient cycling in a hay system

Cited by 6 publications

References 23 publications

Spatial monitoring technologies for coupling the soil plant water animal nexus

Spatial monitoring technologies for coupling the soil plant water animal nexus

Twenty‐year phosphorus trends in forage systems receiving aluminum sulfate‐treated poultry litter

Native Warm-Season Grass Response to Nitrogen Fertilization

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