Development of an on-farm model to predict flow of fecal volatile solids to the liquid and solid handling systems of commercial California dairy farms

Cohen-Davidyan, Tamar; Meyer, Donald L.; Robinson, P.H.

doi:10.1016/j.wasman.2020.04.018

Cited by 3 publications

(5 citation statements)

References 7 publications

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“…Cattle, water, and manure management practices affect the amount of water and manure in the PWW system. Freestall housing directs more manure to liquid manure management systems, which is consistent with higher PWW constituent concentrations (Cohen‐Davidyan et al., 2020). Most Central Valley dairy herds (>67%) house some of their cattle in freestalls (Meyer et al., 2019).…”

Section: Resultsmentioning

confidence: 65%

“…systems, which is consistent with higher PWW constituent concentrations (Cohen-Davidyan et al, 2020). Most Central Valley dairy herds (>67%) house some of their cattle in freestalls (Meyer et al, 2019).…”

Section: Effects Of Management Practices On Constituent Concentrationsmentioning

confidence: 63%

“…A lot of variability in PWW‐N concentration over time remains unexplained. In this study we treat the changes as random, but in reality the changes of lagoon concentration are associated with waste and animal management decisions (Cohen‐Davidyan et al., 2020; Meyer et al., 2019; Powers et al., 1995). How each of these changes affect temporal shifts in N concentration has yet to be characterized or comprehensively modeled.…”

Section: Resultsmentioning

confidence: 99%

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Optimizing accuracy of measurement protocols for nitrogen application in dilute dairy manure

Miller

Clark²,

Meyer

2022

J of Env Quality

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Variability of dairy process wastewater (PWW) nitrogen (PWW-N) content makes precise fertilizing of forage challenging. Our objective was to improve measurement accuracy of PWW-N. We characterized PWW-N and quantified its variability using over 1,000 PWW samples from 91 lagoons on commercial California dairies. We used statistical modeling and stochastic simulations to compare the accuracy of various protocols for measuring PWW-N applied to forage crops. Electrical conductivity (EC) was positively correlated with N concentration within a lagoon (conditional R 2 = .69, mixed model). Simulations compared the accuracy of N application rates when lagoon samples for N analyses were collected more frequently and from more homogeneous lagoons. When sampled quarterly, the N application measurement error was ±50%. Homogenizing PWW and sampling weekly reduced measurement error to ±42 and ±30%, respectively. Simulations using EC as an N concentration proxy within an automated irrigation system reduced N application measurement error to ±5%. More accurate automated N concentration measurements allow for precision N management that meets yield goals and reduces environmental effects.

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Section: Resultsmentioning

confidence: 65%

Section: Effects Of Management Practices On Constituent Concentrationsmentioning

confidence: 63%

Section: Resultsmentioning

confidence: 99%

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Optimizing accuracy of measurement protocols for nitrogen application in dilute dairy manure

Miller

Clark²,

Meyer

2022

J of Env Quality

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“…Dairy production in Australia is predominantly pasture-based. As such, although some challenges faced by the Australian industry are common to other countries, the extensive nature of the industry also presents its own unique challenges, for example, waste management in barn-based dairy systems where waste can be confined and more easily managed compared to pasture-based systems [49,50]. Nevertheless, the examination of governance programs targeted towards different dairy systems is valuable to ensure a holistic review.…”

Section: Opportunities and Challenges For The Australian Dairy Sectormentioning

confidence: 99%

Connecting Nature: The Potential of Australian Dairy Initiatives in Collaborative Biodiversity Governance

et al. 2022

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The dairy industry can be considered a contributor to biodiversity loss in Australia. To address this, many forms of governance can be enlisted, including traditional legislation and regulations, persuasive techniques such as publicly funded subsidy programs or education, and participation in voluntary stewardship programs. This paper explores the benefits of collaborative governance programs, which have international applications to reduce the impact of the dairy industry on biodiversity loss. However, as the Australian sector is unique, the specific opportunities and present challenges are discussed. This paper reports three important objectives that could underpin industry-led initiatives by supporting improved biodiversity conservation on dairy farms: (1) Increase the personal and financial capacities of individual farmers to operate profitable, biodiverse farms; (2) Facilitate market rewards to incentivise pro-conservation behaviours; and (3) Improve the effectiveness of the implementation of biodiversity protection laws and regulatory objectives via collaborative governance arrangements. Existing environmental programs that have been developed by the dairy industry could be suitable for incorporation into more formal co-governance structures sympathetic to biodiversity conservation. However, to be successful in addressing sustainability issues, including biodiversity loss, strengthening the integrity mechanisms around farmers’ self-reporting of performance is required to ensure that the industry can credibly refute claims of greenwashing and defend their environmental credentials in the global marketplace.

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“…In freestall confinement‐style dairies in California's Central Valley, >50% of milk cow manure is collected by flushing freestalls with water (Cohen‐Davidyan et al., 2020). The resulting wastewater is stored in anaerobic ponds (lagoons), where it is subsequently applied to adjacent crop fields through irrigation.…”

Section: Introductionmentioning

confidence: 99%

Reducing greenhouse gas emissions and stabilizing nutrients from dairy manure using chemical coagulation

Ellison¹,

Horwáth²

2021

J of Env Quality

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Two primary concerns of dairies that store manure wastewater in anaerobic ponds are greenhouse gas (GHG) emissions and unpredictable nutrient availability after applying it to forage crops. Solid-liquid separation of dairy manure wastewater with chemical coagulants significantly reduces the fraction of organic matter stored in anaerobic conditions. However, the effects of coagulants on methane emissions from ponds and nutrient availability following field application are not well understood. In this experiment, several metal salts and organic polymers were used to coagulate dairy manure wastewater for separation into solid (floc) and liquid (effluent) fractions. The coagulants tested were ferric sulfate, ferric chloride, polyaluminum chloride, Superfloc C-569, and chitosan. An anaerobic incubation of manure effluent to simulate liquid manure storage and an aerobic incubation of manure floc-amended soil to simulate field application were conducted with analysis of GHGs and carbon and nitrogen transformations. The treatment of chemically separating organic matter from manure wastewater effectively eliminated methane emissions under anaerobic conditions in the laboratory. In the solid manure fraction, organic carbon was stabilized in the chemically separated flocs, and, apart from flocs produced with ferric iron, nitrogen mineralization was reduced as well. Carbon dioxide emissions were also reduced from the flocs applied to soil compared with untreated manure solids.

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Development of an on-farm model to predict flow of fecal volatile solids to the liquid and solid handling systems of commercial California dairy farms

Cited by 3 publications

References 7 publications

Optimizing accuracy of measurement protocols for nitrogen application in dilute dairy manure

Optimizing accuracy of measurement protocols for nitrogen application in dilute dairy manure

Connecting Nature: The Potential of Australian Dairy Initiatives in Collaborative Biodiversity Governance

Reducing greenhouse gas emissions and stabilizing nutrients from dairy manure using chemical coagulation

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