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Nitrogen Dynamics and Fertilizer Use Efficiency in Rice following Straw Incorporation and Winter Flooding

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

View larger version (21K): [in a new window]   Fig. 1. Total above- and belowground N in rice during the 1997 and 1998 growing seasons at Maxwell, CA, as affected by straw management and winter flooding. Error bars are standard error of four replicates.

View larger version (14K): [in a new window]   Fig. 2. Fertilizer 15N use efficiency during the 1997 growing season at Maxwell, CA, as affected by straw management. Error bars are standard error of four replicates.

View larger version (27K): [in a new window]   Fig. 3. Recovery of 15N added to rice in 1997 by rice in the next growing season (1998), as affected by alternative straw-management practices and winter flooding at Maxwell, CA. (A) Includes all above- and belowground sources of N from previous year's fertilizer. (B) Includes only the N through belowground pools (N through residue excluded). Error bars are standard error of four replicates.

View larger version (14K): [in a new window]   Fig. 4. Recovery of incorporated 15N-labeled rice straw (residue N use efficiency) by rice in the next growing season, as affected by winter flooding at Maxwell, CA. Error bars are standard error of four replicates.