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Producing vigorous seedlings and transplanting them at the appropriate age are the most important factors for obtaininghigh yield in rice (Oryza sativa L.) paddy production. The impact of seeding densities, N, and seedling age was evaluated inthis experiment after transplanting 10, 20, 30 and 40-d old seedlings raised by using different seeding rates (high and low)and N conditions (with and without) in the 2008 and 2009 rice growing seasons. The study revealed that 10-d-old nurseryseedlings, irrespective of seeding densities and fertilizer application, showed higher yields and yield attributes (productivetillers, plant height, 1000-grain weight, and straw yield), while at later stages significant interaction was observed withnursery management. Transplanting of 20-d older fertile seedlings grown with low seeding density at nursery-bed, resultedin a higher number of productive tillers m-2 (233.3, 227.3), straw yield (11.1, 10.7 t ha-1), and final yield (3.6, 3.4 t ha-1)in both years, 2008 and 2009, respectively. Yield and yield attributes were significantly reduced by transplanting olderseedlings grown at high seeding density and without N application at nursery-bed. Minimum productive tillers (165.7, 133),straw yield (8.7, 8.1 t ha-1) and paddy yield (2.0, 1.8 t ha-1) were recorded with transplanting 40-d older seedlings grownat high seeding density and without N application. These findings support the use of young seedling in a system of riceintensification and illustrate that by making a minor additional investment to raise healthy and vigorous seedlings in nurseryseed-bed, farmers can improve yields.

Impact of Nursery Seeding Density, Nitrogen, and Seedling Age on Yield and Yield Attributes of Fine Rice