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Fig. 1. (a) Time course for recovery of 15N in rice plants from an application of labeled (99% atom 15N excess) nitrate at (
) 17 DAT and (
) 55 DAT at the 5-cm soil depth in the wet season of 2001. Each point is the mean of four replicates and vertical lines indicate standard errors. The curve for 17 DAT is Rc = 0.26[1 – exp(–1.01tdal)], r2 = 0.95 and for 55 DAT is Rc = 0.22[1 – exp (–0.28tdal)], r2 = 0.96. (b) The recovery of 15N in rice plants at weekly intervals following an application of labeled (99% atom 15N excess) () nitrate and (
) urea at 35 DAT, at the 5-cm soil depth in the wet season of 2001. Each point is the mean of four replicates and vertical lines indicate standard errors. The curve for nitrate is Rc = 0.23[1 – exp(–0.27tdal)], r2 = 0.95 and for urea is Rc = 0.58[1 – exp(–0.47tdal)], r2 = 0.80.
