Effect of urea-based N sources in rice-wheat cropping sequence [India].
1988
Sharma R.P. | Roy R.K.
Five urea sources-prilled urea (PU), gypsum-coated urea (GCU), nitrohumic-coated urea (NHCU), urea supergranule (USG), and Mussoorie phos-coated urea (MPCU) were compared at 56, 84, and 112 kg N/ha in a 1986-87 wet season-winter season field experiment. Rice grain yield increased significantly up to 112 kg N/ha because of increased panicles/square meter and filled spikelets/panicle. Yields with USG were similar to those with PU and significantly greater than those with other N sources. The higher yield with USG was due mainly to larger panicles/square meter and filled spikelets/panicle. Residual effects of 84 and 112 kg N/ha were similar and significantly superior to those of 56 kg N/ha in the succeeding wheat crop. Maximum wheat grain yield in the plot that received USG for the preceeding rice was significantly superior to that with PU alone.
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