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

This Article Abstract 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 Web of Science Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Web of Science (11) Citing Articles via Google Scholar Google Scholar Articles by Bird, J. A. Articles by Horwath, W. R. Search for Related Content PubMed Articles by Bird, J. A. Articles by Horwath, W. R. Agricola Articles by Bird, J. A. Articles by Horwath, W. R. Related Collections Humic Substances Soil Biochemistry Soil Fertility and Productivity

Nitrogen Dynamics in Humic Fractions under Alternative Straw Management in Temperate Rice

^a Dep. of Land, Air and Water Resources, One Shields Avenue, University of California, Davis, CA 95616
^b Dep. of Agronomy and Range Science, University of California, Davis, CA 95616

View larger version (15K): [in a new window]   Fig. 1. Nitrogen-15 atom excess values (%) of Soil organic matter fractions, 1997 through 1999 (0–15 cm depth). Least-squares means, standard errors (N = 16, average of all treatments). All treatments were flooded during the cropping season while only the winter flooded treatments were flooded during the winter fallow period.

View larger version (30K): [in a new window]   Fig. 2. Nitrogen-15 fertilizer in SOM fractions as a percentage of total 15N recovery as soil N over a 2-yr period (1997–1999) in the 0- to 15-cm soil depth. Least-squares means, standard errors (N = 16, averaged across treatments).

View larger version (16K): [in a new window]   Fig. 3. Percentage of recovery of applied 15N fertilizer in LF over a 2-yr period (1997–1999) in the 0- to 15-cm soil depth when straw was incorporated or burned and the fields were winter-flooded (WF) or nonwinter flooded (NF). Least-squares means, standard errors (N = 4).

View larger version (18K): [in a new window]   Fig. 4. Percentage of recovery of applied 15N fertilizer in MHA, MFA, MAHA, and HUM fractions over a 2-yr period (1997–1999) in the 0- to 15-cm soil depth when straw was incorporated or burned and the fields were winter-flooded (WF) or nonwinter flooded (NF). Least-squares means, standard errors (N = 4).