HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Figures Only Full Text Free Full Text (PDF) Free Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Similar articles in ISI Web of Science Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via ISI Web of Science (11) Citing Articles via Google Scholar Google Scholar Articles by Agehara, S. Articles by Warncke, D. D. Search for Related Content PubMed Articles by Agehara, S. Articles by Warncke, D. D. Agricola Articles by Agehara, S. Articles by Warncke, D. D. Related Collections Nitrogen Soil Biochemistry Soil Fertility and Productivity

Nutrient Management & Soil & Plant Analysis

Soil Moisture and Temperature Effects on Nitrogen Release from Organic Nitrogen Sources

^a Dep. of Crop and Soil Sciences, Michigan State Univ., East Lansing, MI 48824-1325
^b Texas Agricultural Experiment Station, Texas A&M Univ., 1619 Garner Field Rd., Uvalde, TX 78801

^* Corresponding author (ageharas{at}hotmail.com)

Nitrogen release from organic N sources is controlled by the soil environment. Soil incubation was conducted to evaluate the effects of soil moisture (50, 70, and 90% of water holding capacity) and temperature (15/10, 20/15, and 25/20°C [14/10 h]) on N release from four organic N sources. Differential N release kinetics of the N sources were determined by measuring ammonium- and nitrate-N contents periodically over 12 wk. Net N released, as a percentage of organic N, was greatest in the order: urea (91–96%) > blood meal (BM) (56–61%) > alfalfa pellets (AP) (41–52%) > partially composted chicken manure (CM) (37–45%). Increasing soil moisture increased net N released from AP and CM by 12 and 21%, respectively, but did not significantly affect net N released from urea and BM. Increasing temperature increased net N released from AP, BM, and CM by 25, 10, and 13%, respectively, but did not significantly affect net N released from urea. The results indicate that soil moisture and temperature influence N availability from organic N materials differently depending on source of N. In greenhouse production systems, where irrigation and temperature can be controlled, fertilizer management that considers both source of N and soil environment may improve the effectiveness of organic N materials.

Abbreviations: AP, alfalfa pellets • BM, blood meal • CEC, cation exchange capacity • CM, partially composted chicken manure • OM, organic matter • SAS, Statistical Analysis System • TKN, total Kjeldahl-nitrogen • WHC, water holding capacity

This article has been cited by other articles:

				N. Z. Lupwayi and A. C. Kennedy Grain Legumes in Northern Great Plains: Impacts on Selected Biological Soil Processes Agron. J., November 6, 2007; 99(6): 1700 - 1709. [Abstract] [Full Text] [PDF]

				H. E. Mason, A. Navabi, B. L. Frick, J. T. O'Donovan, and D. M. Spaner The Weed-Competitive Ability of Canada Western Red Spring Wheat Cultivars Grown under Organic Management Crop Sci., May 31, 2007; 47(3): 1167 - 1176. [Abstract] [Full Text] [PDF]