Services Directory - NitrogenBalanceTotal(MapServer)

NitrogenBalanceTotal (Map Service)

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Current Version: 10.81

Service Description: Chemical fertilizers, manure and leguminous crops have been key to agricultural intensification. However, they have also led to widespread nutrient pollution and the degradation of lakes, rivers and coastal oceans. Excess nutrients also incur energy costs associated with converting atmospheric nitrogen and mining phosphorus Excess nutrients are calculated as a simple mass balance, which is similar to recent efforts to estimate nutrient balances (Liu et al., MacDonald et al.). Chemical fertilizer and manure data sets are inputs for both nitrogen and phosphorous models. The nitrogen has additional inputs from nitrogen deposition (Dentener et al.) and nitrogen fixation by legumes. Nitrogen fixation is scaled as a function of yields using a range of Nfix values from the literature (Smil 1999) and yields (Monfreda et al. 2008). Nutrient removal from harvest is estimated as the product of yield (Monfreda et al. 2008), dry fraction (Monfreda et al. 2008), and nutrient density (USDA).

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Description: Chemical fertilizers, manure and leguminous crops have been key to agricultural intensification. However, they have also led to widespread nutrient pollution and the degradation of lakes, rivers and coastal oceans. Excess nutrients also incur energy costs associated with converting atmospheric nitrogen and mining phosphorus Excess nutrients are calculated as a simple mass balance, which is similar to recent efforts to estimate nutrient balances (Liu et al., MacDonald et al.). Chemical fertilizer and manure data sets are inputs for both nitrogen and phosphorous models. The nitrogen has additional inputs from nitrogen deposition (Dentener et al.) and nitrogen fixation by legumes. Nitrogen fixation is scaled as a function of yields using a range of Nfix values from the literature (Smil 1999) and yields (Monfreda et al. 2008). Nutrient removal from harvest is estimated as the product of yield (Monfreda et al. 2008), dry fraction (Monfreda et al. 2008), and nutrient density (USDA).

Copyright Text: West, PC, JS Gerber, ND Mueller, KA Brauman, KM Carlson, ES Cassidy, PM Engstrom, M Johnston, GK MacDonald, DK Ray, and S Siebert. 2014. Leverage points for improving food security and the environment. Science. 345:325-328.

Spatial Reference:
102100

Single Fused Map Cache: true

Capabilities: Map,TilesOnly

Tile Info:

Height: 256
Width: 256
DPI: 96
Levels of Detail: (# Levels: 20)

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Format: PNG
Compression Quality: 0
Origin:
Spatial Reference:
102100

Initial Extent:

Full Extent:

Min Scale: 2.95828763795777E8
Max Scale: 4622324.434309

Min LOD: 1
Max LOD: 7

Units: esriMeters

Supported Image Format Types: PNG

Export Tiles Allowed: false
Max Export Tiles Count: 100000

Document Info:

Title: NitrogenBalanceTotal
Author: EarthStat
Comments:
Subject: Chemical fertilizers, manure and leguminous crops have been key to agricultural intensification. However, they have also led to widespread nutrient pollution and the degradation of lakes, rivers and coastal oceans. Excess nutrients also incur energy
Category:
Keywords: earthstat, agriculture, fertilizer, global, food