Nutrient cycling in an agroforestry alley cropping system receiving poultry litter or nitrogen fertilizer

Coblentz, W.K.; Thomas, Andrew L.; Brye, K. R.; Bräuer, David; Skinner, J. J.; Brahana, J.V.; DeFauw, Sherri L.; Hays, Phillip D.; Moffitt, David C.; Robinson, James L.; James, Travis A.; Hickie, Kevin A.

doi:10.1007/s10705-014-9667-0

Cited by 24 publications

(34 citation statements)

References 26 publications

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“…According to Sauer et al (2015), the eastern half of the study site received 3.9 to 6.7 Mg ha −1 fresh poultry litter, whereas the western portion received only 50 to 76 kg ha −1 N as NH 4 NO 3 mineral fertilized annually. The western portion also received an application of P and K fertilizer, as their levels were found to be below optimum for forage growth (Sauer et al, 2015). This indicated that the soils in the western half had always minimum P and K levels that are consistent with our findings.…”

Section: Discussionmentioning

confidence: 99%

“…1) at the University of Arkansas Agricultural Research and Extension Center located in Fayetteville, AR (36°5′ N; 94°10′ W). The site was established in 1999 from an idle, ungrazed pasture to a silvopasture system to evaluate nutrient cycling through plant–soil–ground water continuum representative of northwest Arkansas (Sauer et al, 2015), which covers an area of about 4.3 ha. It consists of 16 east–west oriented tree rows of which the southern six rows were planted with pecan [ Carya illinoinensis (Wangenh.)…”

Section: Methodsmentioning

confidence: 99%

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Topographic Controls on Soil Nutrient Variations in a Silvopasture System

Adhikari

Owens

Ashworth

et al. 2018

Agrosystems Geosci & Env

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Core Ideas Topographic variation influenced soil nutrient distribution in a silvopasture system. High‐resolution digital maps of soil nutrients were generated. Terrain attributes identified topographic functional units as management zones. Level of soil nutrients in topographic functional units were different. Topography plays a crucial role in spatial distribution of nutrients in soils; however, studies to quantify topographic influence on soil nutrient distribution from a silvopasture system are mostly lacking. To address this question, a 4.3‐ha silvopasture site in northwest Arkansas was selected and a total of 51 topsoil (0–15 cm thickness) samples were collected and analyzed for primary (total N [TN], P, K), secondary (Ca, Mg, S), and micronutrients (Fe, Zn, Cu, Mn, B, Na). Topographic information was acquired from 12 terrain attributes derived from a 1‐m digital elevation model. The prediction model was based on random forest. Results showed TN, S, and P were best predicted, whereas Cu, Ca, and Mn had the lowest prediction performance. Levels of S, Ca, Zn, Fe, and TN increased with SAGA wetness index, valley depth, flow accumulation, and multi‐resolution valley bottom flatness index. Normalized height and slope height were positively related to Na but negatively to B and Cu distribution. Aspect had a positive influence on P and Mg concentrations. Based on terrain attributes, the study site could be divided into four topographic functional units (TFU), namely A, B, C, and D; TFU A had the highest nutrients present, whereas TFU B had the lowest P, K, Zn, Cu, Fe, and Ca but highest Na content. However, Mn, Mg, and B did not vary among TFUs. This study affirmed topographic influences on soil nutrient distribution, and the resulting continuous soil nutrient maps are useful for fine‐tuning production systems through optimum nutrient and pasture management.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Topographic Controls on Soil Nutrient Variations in a Silvopasture System

Adhikari

Owens

Ashworth

et al. 2018

Agrosystems Geosci & Env

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“…The four study sites are located in Missouri and Arkansas, USA (Table 1). Significant details on site location, design and establishment, alley vegetation establishment and management, soil chemistry, and weed and pest management were previously described (Brauer and Jones 2003;Burner et al 2015;Coggeshall et al 2003;Sauer et al 2015;Thomas et al 2008), with some relevant details summarized in Table 1. Specific details on site and tree fertilization at all four sites are provided in Thomas et al (2008).…”

Section: Study Locations and Establishmentmentioning

confidence: 99%

“…Weeds and vegetation near trees were suppressed with a weed barrier fabric (1 m 2 ) for the first 5 years, and thereafter with periodic applications of glyphosate herbicide within a 1-m radius. Alleys were initially planted to orchardgrass (Dactylis glomerata L.) that was harvested as hay through 2005, after which mixed grasses and weeds were mowed periodically (Sauer et al 2015).…”

Section: Study Locations and Establishmentmentioning

confidence: 99%

“…They were all 'Kwik-Krop' scions grafted to potted 1-year-old rootstocks (either 'Kwik-Krop', 'Sparrow', or 'Thomas' seedlings) in early Spring 2000, then maintained in the nursery that summer. Trees for FV were identical except that they were produced and transplanted 1 year earlier (Sauer et al 2015). Trees from BN included 'Emma K', 'Kwik-Krop', 'Sauber', and 'Thomas' scions grafted to 'Kwik-Krop' and 'Thomas' seedling rootstocks in various combinations (Brauer and Jones 2003;Burner et al 2015).…”

Section: Tree Resource Harvest and Biomass Data Collectionmentioning

confidence: 99%

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Carbon and nitrogen accumulation within four black walnut alley cropping sites across Missouri and Arkansas, USA

et al. 2020

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Agroforestry systems that integrate useful long-lived trees have been recognized for their potential in mitigating the accumulation of atmospheric fossil fuel-derived carbon (C). Black walnut (Juglans nigra) is frequently planted and cultivated in North America for its valuable lumber and edible nuts, and is highly amenable to the integration of understory crops or livestock in agroforestry systems. However, little is known about C content in black walnut trees, including the amounts of C assimilated into lignocellulosic tissues within different tree compartments. Therefore, allometric equations for above-and below-ground compartments of 10-year-old black walnut trees across diverse locations were developed. Ten grafted black walnut trees from each of four sites across the midwestern USA were destructively harvested for above-and below-ground biomass, and dry biomass weight (DW w), C (C w) and nitrogen (N; N w) stocks were quantified. Soils surrounding the harvested trees were sampled and analyzed for soil organic C (SOC) and total N (TN). Total DW w ranged from 27 to 54 kg tree-1 , with woody tissues containing an average of 467 g kg-1 C and 3.5 g kg-1 N. Woody tissues differed in C w and N w across location, and aboveground sections contained more C and less N compared with most root tissues. The slopes of the allometric equations did not differ significantly among locations, while intercepts did, indicating that trees only differed in initial size across locations. SOC and TN did not vary in distance from the trees, likely because the trees were not yet old enough to have impacted the surrounding soils. Our results establish a

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Root decomposition in silvopastures is influenced by grazing, fertility, and grass species

Ashworth

Adams

Kharel

et al. 2021

Agrosystems Geosci & Env

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Grass root production and decomposition is a major source of C entering soils, although rates are largely unknown based on edaphic and management factors. Therefore, study objectives were to evaluate four explanatory variables including forage species (native and nonnative), fertility (poultry litter and a control), soil moisture (udic and aquic), and pasture management (grazed and an ungrazed control) in order to evaluate driving factors for root turnover and subsequent soil organic matter formation in silvopastoral systems using the root litter bag technique. Native grass root decomposition was accelerated relative to the nonnative forage based on root mass balance, as well as the exponential decay function, likely owing to greater fiveand six-C sugars and more digestible root tissues of native grasses. These physiochemical results suggest more favorable microbial food sources, which culminate in faster decomposition and greater microbially derived organic matter. Overall, there was greater root sloughing and subsequent soil organic matter formation potential with native grass species and poultry litter applications, with soil moisture affecting decomposition to a lesser extent. This study contributes to the understanding of complex interactions of grass species, soil moisture, nutrients, and grazing, which controls primary productivity, as well as nutrient cycling and C sequestration in silvopastures.

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Nutrient cycling in an agroforestry alley cropping system receiving poultry litter or nitrogen fertilizer

Cited by 24 publications

References 26 publications

Topographic Controls on Soil Nutrient Variations in a Silvopasture System

Topographic Controls on Soil Nutrient Variations in a Silvopasture System

Carbon and nitrogen accumulation within four black walnut alley cropping sites across Missouri and Arkansas, USA

Root decomposition in silvopastures is influenced by grazing, fertility, and grass species

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