Amino acid composition of soil organic matter and nitrogen transformations in soils under different management systems

“…Several researchers (Grov, 1963;Grov and Alvsaker, 1963;Ivarson andSowden, 1966, 1970Paul and Schmidt, 1960;Stevenson, 1982Stevenson, , 1985Monreal and McGill, 1985) have studied the portion of "firee" amino adds in soils because it is an available energy source for soil microorganisms (Ivarson and Sowden, 1966) and an available N source for plant growth (Broadbent, 1984). activities (Frankenberger and Tabatabai, 1991c,d;Senwo andTabatabai, 1996,1999). Systematic studies have been done to optimize the assay conditions needed to measure the activities of more than 15 different enzymes present in soils (Casida, 1964;Senwo and Tabatabai, 1996) (Ladd and Jackson, 1982;Senwo and Tabatabai, 1996).…”

mentioning

confidence: 99%

Arylamidase Activity of Soils

nez

Tabatabai

2000

Soil Science Soc of Amer J

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This manuscript has been reproduced from the microfilm master. UMI films the text directly from the original or copy submitted. Thus, some thesis and dissertation copies are in typewriter face, while others may be from any type of computer printer. The quality of this reproduction is dependent upon the quality of the copy submitted. Broken or indistinct print, colored or poor quality illustrations and photographs, print bleedthrough, substandard margins, and improper alignment can adversely affect reproduction. In the unlikely event that the author dkJ not send UMI a complete manuscript and there are missing pages, these will be noted. Also, if unauthorized copyright material had to be removed, a note will indicate the deletion. Oversize materials (e.g., maps, drawings, charts) are reproduced by sectioning the original, beginning at the upper left-hand comer and continuing from left to right in equal sections with small overiaps. Photographs included in the original manuscript have been reproduced xerographically in this copy. Higher quality 6' x 9" black and white photographic prints are available for any photographs or illustrations appearing in this copy for an additk)nal charge. Contact UMI directly to order. Bell & Howell Informatton and Learning 300 North Zeeb Road. Ann Arbor, Ml 48106-1346 USA 800-521-0600 Arylamidase activity of soils by Ver6nica Acosta-Martinez A dissertation submitted to the graduate faculty in partial fulfillment of the requirements for the degree of

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“…The increase in NO 3 -N concentrations in the leachate with time was due to an increase in nitrification rates of ammonium ions from applied urea to NO 3 -N form. Thus, nitrification rates increased because urea (like other ammonium forming fertilizers) increased the nitrifiers populations responsible for nitrification in soils and/or that urea fertilizer increased nitrifiers adaptations and efficiency by changing soil pH and inducing the enzymes responsible for oxidizing NH 4 + to NO 3 in soils (Senwo, 1995;Tlustos and Blackmer, 1992). Another explanation could be due to more mixing and reaction of lime with the soil that resulted in the reduction in the number of positive charges in the soil, and consequently, anion exclusion (NO 3 -) from the soil matrix (Curtin and Smillie, 1983).…”

Section: No 3 -N Concentrations In the Leachate As Affected By Lime Amentioning

confidence: 99%

“…Lime reduces aluminum (Al) and manganese (Mn) to subtoxic levels, and affects the soil's ability to retain anions and cations. Liming increases nitrification rates (expressed as percentages of NH 4 -N added) from 27% for untreated (0 kg ECCE ha -1 ) to 76% for treated (17920 kg ECCE ha -1 ) soils (Senwo, 1995). Senwo concluded that liming stimulated the microbial population responsible for nitrification in soils.…”

mentioning

confidence: 97%

Atrazine and Nitrate-Nitrogen Leaching Through Undisturbed Soil Columns as Affected by Lime Application

Chinkuyu¹,

Kanwar²

1999

Transactions of the ASAE

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Farm operators need information that enable them to select a combination of farming systems that minimizes the movement of agricultural chemicals into water sources. Agricultural lime (CaCO3) applied to the soil to reduce soil acidity, can affect the movement and fate of agricultural chemicals in the soil. A laboratory study was conducted to determine the effects of three application rates of lime (0, 5 and 10 Mg ha-1) on atrazine (2-chloro-4-ethylamino-6-isopropylamino-1, 3, 5 triazine) and nitrate-nitrogen (NO3-N) transport through undisturbed-unsaturated soil columns. Urea (H2NCONH2) and atrazine were applied on the surface of soil columns one month after mixing lime in the top 20 mm of surface soil of these columns. Five different irrigations, totaling 36.5 cm of distilled deionized water, were used in this study. The results indicate that lime application had no significant effect on the leachate depth and pH. An increase in lime application rate increased the concentrations of Ca and NO3-N in the leachate. The concentration of NO3-N in the leachate increased with increased irrigation events for limed soil columns. The concentration of atrazine in the leachate increased significantly with increased lime application rates and decreased with subsequent irrigation events. Disciplines Agriculture | Bioresource and Agricultural Engineering CommentsThis article is from Transactions of the ASAE 42 (1999): 937-944, doi:10.

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Amino acid composition of soil organic matter and nitrogen transformations in soils under different management systems

Cited by 6 publications

References 250 publications

Effect of soil pH on phytoavailability of nitrogen in biotechnology by-products and animal manures

Effect of soil pH on phytoavailability of nitrogen in biotechnology by-products and animal manures

Arylamidase Activity of Soils

Atrazine and Nitrate-Nitrogen Leaching Through Undisturbed Soil Columns as Affected by Lime Application

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