Effects of Seedling Ages and Nitrogen Rates on growth, Yield and Grain Quality of KDML105

Abstract

A field experiment was conducted to investigae the effects of ssdling ages and nitrogen rates on KDML 105, an aromatic rice variety, at Phitsanulok Rice Research Center during July to December 1994. The experiment was designed as 3x6 factorial in RCB with 3 replications. Treatments are 3 seedling ages (30, 40 and 60 days) and 6 nitrogen rates (0, 6, 9, 12, 15 and 18 kgN/rai). The results showed that aged seedlings (45 and 60 days) of KDML 105 decreased plant height and tiller number, while nitrogen increased them. Rice transplanted with 45 and 60 days seedlings gave lower yield than that with 30 day seedlings. However, nitrogen application could increase the yield. Physical and chemical grain quailty were not afected by different seedling ages or nitrogen rates.