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| Web URL(s): | http://www.tandfonline.com/doi/pdf/10.1081/CSS-120027645
Last checked: 10/15/2015
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| Publication Type:
| Report |
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| Author(s): | Yasrebi, J.;
Karimian, N.;
Maftoun, M.;
Abtahi, A.;
Ronaghi, A.;
Assad, M. T. |
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| Author Affiliation: | College of Agriculture, Shiraz University, Shiraz, Iran |
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| Title: | Laboratory and greenhouse evaluation of ultraviolet light absorption methods of estimating nitrogen supplying capacity of calcareous soils |
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| Source: | Communications in Soil Science and Plant Analysis. Vol. 35, No. 1/2, January 2004, p. 219-232. |
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| Publishing Information: | New York, NY: Marcel Dekker |
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| # of Pages: | 14 |
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| Keywords: | TIC Keywords: Nitrogen; Chemical properties of soil; Calcareous soils; Nitrogen uptake; Nitrates; Ammonia; Soil testing; Measurement
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| Abstract/Contents: | "Application of nitrogen (N) fertilizers without knowing the nitrogen supplying capacity (NSC) of soils may lead to low N use efficiency, uneconomical crop production, and pollution of environment. Twenty-five surface (0-20 cm) soil samples (pH 7.9-8.3; organic matter 7.8-35.0 g kg-1; calcium carbonate equivalent 253-648 g kg-1) from cultivated lands of Fars Province of Iran were used in laboratory and a 6-week greenhouse experiment to compare seven methods of estimating NSC of calcareous soils. The methods used were (i) determination of NH4+-N produced following the anaerobic incubation of soils; (ii) determination of NO3--N extracted from soils by 2 M KCl; (iii) determination of NO3--N extracted from soils by H20; (iv), (v), (vi) measuring the amount of ultraviolet (UV) light absorption by soil extracts at 200, 205, and 260 nm; and (vii) determination of NO3--N from the "second derivative" of light absorbance of soil extracts in the range of 200-280 nm. The soils, provided with sufficient nutrients other than N, were planted with corn (Zea mays L., cv Single Cross 704) and total N taken up by aerial parts of the plants was taken as the NSC of soils. Regression equations obtained between plant N uptake and each of the methods showed that absorbance at 205 nm was the best method, predicting 70.5% of the variablities in NSC, when used alone. The "second derivative" method, when used along with organic matter and clay contents of the soils, predicted 84.2% of the variabilities in NSC. It is suggested that UV absorbtion methods be considered as a measure of NSC because they are more rapid, less laborious, and consume less chemicals than biological and conventional chemical methods." |
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| Language: | English |
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| References: | 26 |
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| Note: | Tables |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Yasrebi, J., N. Karimian, M. Maftoun, A. Abtahi, A. Ronaghi, and M. T. Assad. 2004. Laboratory and greenhouse evaluation of ultraviolet light absorption methods of estimating nitrogen supplying capacity of calcareous soils. Commun. Soil. Sci. Plant Anal. 35(1/2):p. 219-232. |
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| Web URL(s):
http://www.tandfonline.com/doi/pdf/10.1081/CSS-120027645
Last checked: 10/15/2015
Requires: PDF Reader
Access conditions: Item is within a limited-access website |
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MSU catalog number: S 590 .C54 |
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