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Stabilization of ¹³C-Carbon and Immobilization of ¹⁵N-Nitrogen from Rice Straw in Humic Fractions

^a Dep. of Land, Air, and Water Resources, Univ. of California, Davis, CA, 95616
^b Dep. of Agron. and Range Sci., Univ. of California, Davis, CA 95616

View larger version (21K): [in a new window]   Fig. 1. Mean monthly precipitation and temperature (1961–1990) located in Colusa County, CA. Values summarized by the U.S. Western Regional Climate Center, Reno, NV.

View larger version (23K): [in a new window]   Fig. 2. Design of stable isotope 13C- and 15N-labeling growth chamber. Two square meters of rice (cultivar M-103) was produced in greenhouse facilities at the University of California, Davis.

View larger version (36K): [in a new window]   Fig. 3. Recovery of 13C (top) and 15N (bottom)-crop residue as a percentage of that applied in November 1998 from soil sampled in April 1999 and September 1999. Soil recoveries were from soil sampled to the 0- to 15-cm depth when straw was incorporated (I) or burned (B) and the fields were winter flooded (WF) or nonwinter flooded (NF) (N = 4).