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Winter Straw and Water Management Effects on Soil Nitrogen Dynamics in California Rice Systems

^a Dep. of Plant Sciences, Univ. of California, Davis, CA 95616
^b Dep. of Agronomy, Purdue Univ., West Lafayette, IN 47907-1105

View larger version (29K): [in a new window]   Fig. 1. Precipitation and maximum and minimum temperatures during the 1995–1996 winter and spring.

View larger version (39K): [in a new window]   Fig. 2. Soil extractable N (ExN) as affected by winter flood (F) or no flooding (NF) and winter straw management in the –N microplots. Sample times were before draining the winter flood treatments, during the spring dry down period, and during the growing season in the –N plots for both Maxwell and Biggs sites. All plots were flooded at Maxwell on 5 May and at Biggs on 16 May in preparation for planting. Above each sample time, where differences are significant, the analysis of variance (ANOVA) results are presented for the effect of winter flood (F) the effect of straw management (S) and the interaction (F x S). *, **, and *** represent a significance level of 0.05, 0.01, and 0.001, respectively.

View larger version (32K): [in a new window]   Fig. 3. Soil extractable N (ExN) as affected by winter flood (F) or no flooding (NF) and winter straw management in the main field (+N). Sample times were during the growing season. All plots were flooded at Maxwell on 5 May and at Biggs on 16 May in preparation for planting. Above each sample time, where differences are significant, the analysis of variance (ANOVA) results are presented for the effect of winter flood (F) the effect of straw management (S) and the interaction (F x S). *, **, and *** represent a significance level of 0.05, 0.01, and 0.001, respectively.