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RICE

Rice Seeding and Nitrogen Rate Effects on Yield and Yield Components of Two Rice Cultivars

^a Delta Res. and Ext. Center, Mississippi State Univ., P.O. Box 197, Stoneville, MS 38776
^b RiceTec, Inc., 822 Woodruff, Sikeston, MO 63801
^c Rice Research Station, Louisiana State Univ. AgCenter, 1373 Caffey Rd., Rayne, LA 70578. Joint contribution of the Louisiana and Mississippi Agric. Exp. Stn. Louisiana State Univ. AgCenter Publ. 07-61-0198. Mississippi Agric. Exp. Stn. Publ. J-11162. This research was funded in part by the Louisiana Rice Res. Board, the Mississippi Rice Promotion Board, and USDA-CSREES

^* Corresponding author (JBond{at}drec.msstate.edu).

Field research was conducted for 2 yr to investigate the relationship between rice (Oryza sativa L.) seeding rate and preflood nitrogen (N) rate utilizing long-grain rice cultivars planted into clay and silt loam soils. Rice cultivars included ‘Cheniere’ and ‘Wells’ seeded at 162, 323, and 646 seeds m^–2. Nitrogen was applied before flooding at 67, 134, and 202 kg ha^–1. No response to soil texture and no interaction between seeding rate and N rate were detected for the parameters examined. The lowest applied N rate had lower yield than the other two N rates. Rough rice yields were 7564 for 67 kg N ha^–1, 8520 for 134 kg N ha^–1, and 9000 for 202 kg N ha^–1 averaged over all cultivars, seeding rates, and soil textures. Similarly, when head rice yield was pooled across soil texture and seeding rate, head rice yield of Cheniere was independent of N rate, but head rice yield of Wells increased when the N rate was increased from 67 to 202 kg ha^–1. Panicle density responded to N rate similar to rough rice yield. Panicle density increased with seeding rate up to 418 panicles m^–2 at a seeding rate of 646 seeds m^–2. Filled grain panicle^–1 was highest at a seeding rate of 162 seeds m^–2. Cheniere produced more filled grain panicle^–1 while Wells had a higher 1000-grain weight. Grain yield and yield components of Cheniere and Wells respond to seeding rates and N rates independently when planted into clay or silt loam soils.

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Received for publication March 26, 2007.