Coupling Dairy Manure Storage with Injection to Improve Nitrogen Management: Whole‐Farm Simulation Using the Integrated Farm System Model

Until recently, nutrient losses from livestock manure have been of little concern. Manure, a valuable by-product in the past, is now regarded as a waste product to be disposed of in the cheapest manner possible. The cost of manure handling frequently exceeds the value of the nutrients in it. This is still true in 1974 even though the price of fertilizer has increased substantially.

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Pasture persistence: how much is it worth?

NZGA: Research and Practice Series ◽

10.33584/rps.15.2011.3213 ◽

2011 ◽

Vol 15 ◽

pp. 3-6

Author(s):

R. Brazendale ◽

J.R. Bryant ◽

M.G. Lambert ◽

C.W. Holmes ◽

T.J. Fraser

Keyword(s):

Dry Matter ◽

Management Practices ◽

Dairy Farm ◽

Dairy Farms ◽

System Model ◽

Dry Matter Yield ◽

Farm Profitability ◽

Farm System ◽

The Impact ◽

Different Levels

The farm system model, Farmax Dairy Pro, was used to evaluate the impact of new pastures on dairy farm profitability, assuming a range of pasture yields and qualities, and different levels of persistence in the new pastures, which were established on 10% of the farm annually. Scenarios were tested for Waikato, Taranaki, Canterbury and Southland dairy farm systems. Assuming a $6.50/kg MS milk payment and a response to pasture renewal of 10% in dry matter yield and a 0.6 MJ ME/kg DM increase in quality, increasing persistence from 4 years up to 8 years was modelled to increase dairy farm profitability by $271/ha to $478/ha. Management practices, including selections of cultivars and endophytes, that improve pasture persistence are likely to increase dairy farm profitability. Keywords: dairy farms, modelling, pasture renewal, persistence

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An improved mechanistic model for ammonia volatilization in Earth system models: Flow of Agricultural Nitrogen version 2 (FANv2)

Geoscientific Model Development ◽

10.5194/gmd-13-4459-2020 ◽

2020 ◽

Vol 13 (9) ◽

pp. 4459-4490 ◽

Cited By ~ 2

Author(s):

Julius Vira ◽

Peter Hess ◽

Jeff Melkonian ◽

William R. Wieder

Keyword(s):

Process Model ◽

Mechanistic Model ◽

Earth System Model ◽

System Model ◽

Mineral Fertilizers ◽

Earth System ◽

Community Earth System Model ◽

Manure Storage ◽

Significant Pathway ◽

Global Emissions

Abstract. Volatilization of ammonia (NH3) from fertilizers and livestock wastes forms a significant pathway of nitrogen losses in agricultural ecosystems and constitutes the largest source of atmospheric emissions of NH3. This paper describes a major update to the process model FAN (Flow of Agricultural Nitrogen), which evaluates NH3 emissions interactively within an Earth system model; in this work, the Community Earth System Model (CESM) is used. The updated version (FANv2) includes a more detailed treatment of both physical and agricultural processes, which allows the model to differentiate between the volatilization losses from animal housings, manure storage, grazed pastures, and the application of manure and different types of mineral fertilizers. The modeled ammonia emissions are first evaluated at a local scale against experimental data for various types of fertilizers and manure, and they are subsequently run globally to evaluate NH3 emissions for 2010–2015 based on gridded datasets of fertilizer use and livestock populations. Comparison of regional emissions shows that FANv2 agrees with previous inventories for North America and Europe and is within the range of previous inventories for China. However, due to higher NH3 emissions in Africa, India, and Latin America, the global emissions simulated by FANv2 (48 Tg N) are 30 %–40 % higher than in the existing inventories.

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Adaptation and evaluation of the integrated farm system model to simulate temperate multiple-species pastures

Agricultural Systems ◽

10.1016/j.agsy.2007.01.003 ◽

2007 ◽

Vol 94 (2) ◽

pp. 502-508 ◽

Cited By ~ 18

Author(s):

Michael S. Corson ◽

C. Alan Rotz ◽

R. Howard Skinner ◽

Matt A. Sanderson

Keyword(s):

System Model ◽

Multiple Species ◽

Farm System

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