amino sugar-n soil test
DESCRIPTION
Amino Sugar-N Soil Test. Jacob Bushong SOIL 5813 Feb. 14, 2014. Nitrogen Soil Test History. “Holy Grail” of soil test methods Several researchers have attempted Bremner , Stanford, Keeney Biological or Chemical Methods Incubation Acidic or alkaline oxidation or hydrolysis - PowerPoint PPT PresentationTRANSCRIPT
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Amino Sugar-N Soil Test
Jacob BushongSOIL 5813
Feb. 14, 2014
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Nitrogen Soil Test History
• “Holy Grail” of soil test methods• Several researchers have attempted– Bremner, Stanford, Keeney
• Biological or Chemical Methods– Incubation– Acidic or alkaline oxidation or hydrolysis– Analysis of salt extractions
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Beginning of the ISNT• Dr. Mulvaney had noticed different responses to
sidedress fertilizer applications in corn • Investigated the different organic N forms in soil– Total N– Acid hydrolyzable• NH4
• Amino Sugar• Amino Acid
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Hydrolyzable Amino Sugar N
• Mulvaney et al. (2001)
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Development of ISNT• Time needed to conduct the hydrolyzable soil
test was greater than 12 hours.• Quicker/simpler methods were evaluated• Accelerated Diffusion
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ISNT Results
• Khan et al. (2001)
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Nitrogen Soil Test for Rice
• Bushong et al. (2007)
Arkansas Delta Soils (n = 16)United States Soils (n = 50)
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Evaluation of Hydrolyzable Amino Sugar-N
• Bushong et al. (2008)
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Evaluation of Hydrolyzable Amino Sugar-N
• Bushong et al. (2008)
6 Hours
10 Minutes
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Evaluation of Hydrolyzable Amino Sugar-N
• Bushong et al. (2008)
N-ST*R
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Field Evaluation of N-ST*R
0 50 100 150 200DSD 0-45 cm (mg N kg soil-1)
0
40
80
120
160
NRatetoAchieve
95%RGY(kgNha
-1) y = 337 - 2.10x
n = 23 r2 = 0.89***
• Roberts et al. (2011)
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Other’s Results for Corn
• Laboski et al. (2008)