scholarly journals FT-NIR Spectroscopic Analysis of Nitrogen in Cotton Leaves

2002 ◽  
Vol 56 (11) ◽  
pp. 1484-1489 ◽  
Author(s):  
Mark R. Riley ◽  
Loreto C. Cánaves
Keyword(s):  
Nitrogen Content ◽  
Total Nitrogen ◽  
Standard Error ◽  
Near Infrared ◽  
Total Nitrogen Content ◽  
Least Squares Regression ◽  
Nitrogen Levels ◽  
Plant Chemical ◽  
Grid Search Method ◽  
Kjeldahl Method

Near-infrared spectroscopy was evaluated as a means to quantify the nitrogen content in fresh cotton leaves ( Gossypium hirsutum L. var. Delta Pine 90) subjected to a factorial design experiment of varying nitrogen and water applications. Absorbance spectra were collected in the 10 000–4000 cm−1 (1000–2500 nm) region from fresh cotton leaves over a two month portion of the growing season. Total nitrogen content was quantified by a wet chemistry Kjeldahl method for validation purposes. Partial least-squares regression analysis, using an automated grid search method, selected the spectral region 6041 to 5651 cm−1 (1650–1770 nm) for analysis based on having the lowest standard error of prediction of total nitrogen content. This region includes protein spectral features. Nitrogen predictions resulted in a correlation coefficient of 0.83, and a standard error of prediction of 0.29% for nitrogen levels ranging from 3.1 to 5.2% total nitrogen. This approach has promise for providing rapid plant chemical analyses for cotton crop fertilization management purposes.

Near infrared spectrophotometric analysis of total nitrogen content in green tea.

1985 ◽  
Vol 32 (8) ◽  
pp. 553-559 ◽  
Author(s):  
Kenjiro IKEGAYA ◽  
Akihiro HINO ◽  
Jun UOZUMI ◽  
Hirotsugu TAKAYANAGI ◽  
Toyomasa ANAN ◽  
...  
Keyword(s):  
Nitrogen Content ◽  
Green Tea ◽  
Total Nitrogen ◽  
Near Infrared ◽  
Spectrophotometric Analysis ◽  
Total Nitrogen Content

scholarly journals The balance of nitrogen forms and number of microorganisms of the nitrogen cycle in vermicomposts based on leaf litter and cow manure

2021 ◽  
Vol 935 (1) ◽  
pp. 012002
Author(s):  
A Kurovsky ◽  
E Kornievskaya ◽  
Ya Gummer ◽  
A Babenko ◽  
M Saratchandra Babu
Keyword(s):  
Nitrogen Content ◽  
Leaf Litter ◽  
Total Nitrogen ◽  
Nitrogen Cycle ◽  
Dry Matter ◽  
Total Nitrogen Content ◽  
Cow Manure ◽  
Nitrogen Forms ◽  
Number Of Microorganisms ◽  
Kjeldahl Method

Abstract The processes of nitrogen transformation in the vermiculture system by Eisenia fetida using cow manure and leaf litter (poplar with small birch addition) have been investigated. Vermicomposting was carried out for five months in half-cubic meter wooden containers. The Kjeldahl method and potentiometry determined the total nitrogen, NH4 + and NO3- content in vermicompost. The total nitrogen content in cow manure was 1.83%, in leaf litter - 0.73%. The nitrate and ammonium content in non-composted leaf litter was 351 and 7.3 mEq/kg of dry matter, respectively. The nitrate and ammonium content in non-composted cow manure was 18.2 and 22 mEq/kg, respectively. Both investigated substrates of vermicomposting did not influence total nitrogen content. In cow manure-based vermicomposting system, the ammonium amount decreased by 5.3 times, while the concentration of nitrates increased by 6.5 times. In the leaf litter-based vermicomposting system, the ammonium amount increased by 2.9 times, and the amount of the nitrate increased by 1.6 times. The Azotobacter bacteria actual activity in both vermicomposts was close to 100%. The sum of nitrogen cycle microorganisms in manure vermicompost was 2.4 times higher than in leaf litter vermicompost.

Operational Results of the Wolfsburg Wastewater Treatment Plant

1992 ◽  
Vol 25 (4-5) ◽  
pp. 203-209 ◽  
Author(s):  
R. Kayser ◽  
G. Stobbe ◽  
M. Werner
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Nitrogen Content ◽  
Total Nitrogen ◽  
Nitrogen Removal ◽  
Wastewater Treatment Plant ◽  
Treatment Plant ◽  
Phosphate Removal ◽  
Total Nitrogen Content ◽  
Activated Sludge Process

At Wolfsburg for a load of 100,000 p.e., the step-feed activated sludge process for nitrogen removal is successfully in operation. Due to the high denitrification potential (BOD:TKN = 5:1) the effluent total nitrogen content can be kept below 10 mg l−1 N; furthermore by some enhanced biological phosphate removal about 80% phosphorus may be removed without any chemicals.

scholarly journals Exploring the role of macroalgal traits on the feeding behaviour of a generalist herbivore in Malaysian waters

2020 ◽  
Vol 63 (5) ◽  
pp. 407-417
Author(s):  
Lim Wai Yin ◽  
Lim Phaik Eem ◽  
Affendi Yang Amri ◽  
Song Sze Looi ◽  
Acga Cheng
Keyword(s):  
South China Sea ◽  
Nitrogen Content ◽  
Total Nitrogen ◽  
South China ◽  
Nutritional Quality ◽  
Feeding Behaviour ◽  
Total Nitrogen Content ◽  
Generalist Herbivore ◽  
Macroalgal Species ◽  
Straits Of Malacca

AbstractWith the potential adverse effects of climate change, it is essential to enhance the understanding of marine ecosystem dynamics, which can be driven by the co-evolutionary interaction between autotrophs and herbivores. This study looked into the autotroph-herbivore interactions in Malaysian waters, mainly to determine if autotroph nutritional quality significantly influences herbivore consumption rates. We documented the relative consumption rate of a generalist herbivore (Chanos chanos Forsskål) obtained from the Straits of Malacca through multiple feeding trials using 12 macroalgal species collected from different coastal areas of the Straits of Malacca, the Straits of Johor, and the South China Sea. The herbivore fed selectively on the tested macroalgal species, with the most and least consumed species having the lowest and highest total nitrogen content, respectively. Besides total nitrogen content, the least consumed species also had the highest total phenolic content. Interestingly, we observed that the herbivore generally preferred to consume filamentous macroalgae, especially those collected from the South China Sea. Overall, our findings demonstrated that the feeding behaviour of a generalist herbivore could be influenced by the nutritional quality of the autotrophs, which may depend directly or indirectly on other factors such as autotroph morphology and geography.

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