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Development of a mid-infrared techni...

Jahn, Bernard Reuben.

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Development of a mid-infrared technique for determination of soil nitrate content.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Development of a mid-infrared technique for determination of soil nitrate content./
作者:	Jahn, Bernard Reuben.
面頁冊數:	168 p.
附註:	Adviser: Shrini K. Upadhyaya.
Contained By:	Dissertation Abstracts International67-04B.
標題:	Agriculture, Agronomy. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3212859
ISBN:	9780542632211

Development of a mid-infrared technique for determination of soil nitrate content.
Jahn, Bernard Reuben.

Development of a mid-infrared technique for determination of soil nitrate content. - 168 p.

Adviser: Shrini K. Upadhyaya.

Thesis (Ph.D.)--University of California, Davis, 2006.

Nitrogen is a major crop nutrient that is often applied in large amounts in production agriculture to achieve high yield. From an agricultural standpoint, over-application of fertilizers not only represents wasted resources, but can also lead to nitrate leaching into soil zones that are too deep for plant roots to utilize. With sufficient water, the nitrate will leach into the groundwater leading to health and environmental problems, such as stomach cancer and algal bloom. A rapid and accurate method is needed for determination of nitrate amounts in the soil in order to determine the amount of nitrate fertilizer to be applied without resulting in leaching problems.

ISBN: 9780542632211Subjects--Topical Terms:

1018679
Agriculture, Agronomy.

Development of a mid-infrared technique for determination of soil nitrate content.
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100 1 $a Jahn, Bernard Reuben. $3 1269192
245 1 0 $a Development of a mid-infrared technique for determination of soil nitrate content.
300 $a 168 p.
500 $a Adviser: Shrini K. Upadhyaya.
500 $a Source: Dissertation Abstracts International, Volume: 67-04, Section: B, page: 2097.
502 $a Thesis (Ph.D.)--University of California, Davis, 2006.
520 $a Nitrogen is a major crop nutrient that is often applied in large amounts in production agriculture to achieve high yield. From an agricultural standpoint, over-application of fertilizers not only represents wasted resources, but can also lead to nitrate leaching into soil zones that are too deep for plant roots to utilize. With sufficient water, the nitrate will leach into the groundwater leading to health and environmental problems, such as stomach cancer and algal bloom. A rapid and accurate method is needed for determination of nitrate amounts in the soil in order to determine the amount of nitrate fertilizer to be applied without resulting in leaching problems.
520 $a Mid Infrared (mid-IR) spectroscopy experiments were conducted to detect added nitrate in various soil types both in the laboratory and field. Wavelet analysis was applied to soil Fourier transform infrared (FTIR) attenuated total reflectance (ATR) spectral data in order to predict nitrate contents. Soil pastes from 14 different soils, including sandy loam, clay, and peat, were analyzed for soil nitrate contents using the FTIR/ATR technique. Three-dimensional plots were created by graphing the wavelet deconvoluted values at 32 scales for each sample. From each plot, the volume of the nitrate peak was determined and correlated to nitrate concentration. Results of the laboratory experiments indicated R2-values as high as 0.99 and standard errors as low as 24 ppm NO3-N for soil-specific calibrations. Results of the field experiments gave R2-values as high as 0.98 and standard errors as low as 5 ppm NO3-N for soil-specific calibrations.
520 $a An alternate technique to determine nitrate content was developed in which wavelet analysis was used to identify a few wavenumbers at which interferences from other ions were minimal. This method produced calibration equations that were soil independent and gave superior results to those obtained based on correlating wavelet deconvoluted volumes to nitrate concentrations.
520 $a Moreover, the applicability of a rugged linear array filter-based spectrometer for potential development of a field sensing unit to measure soil nitrate concentrations was investigated. This unit yielded multi-variable models for predicting nitrate concentrations with R2-values higher than 0.94 and standard errors less than 15 ppm NO3-N.
590 $a School code: 0029.
650 4 $a Agriculture, Agronomy. $3 1018679
650 4 $a Agriculture, Soil Science. $3 1017824
650 4 $a Engineering, Agricultural. $3 1019504
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690 $a 0481
690 $a 0539
710 2 $a University of California, Davis. $3 1018682
773 0 $t Dissertation Abstracts International $g 67-04B.
790 $a 0029
790 1 0 $a Upadhyaya, Shrini K., $e advisor
791 $a Ph.D.
792 $a 2006
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3212859