SPR93049-PTT-30-4-1-2 ข้าวสายพันธุ์ดีเด่นของภาคกลาง

Abstract

Thai female parent (SPR85163-5-1-1-2) and a male parent from IRRI (IR54017-131-1-3-2) had been cross pollinated at Suphanburi Rice Research Center and SPR93049-PTT-30-4-1-2 had been derived at Pathum Thani Rice Research Center, 3 years later. This promising line is photoperiod insensitive non-glutinous rice with erect and strong culms, erect flag leaf, compact panicle with well exertion. Its panicle is intermediate long, 188 filled grains per panicle of 92 percent seed setting. This line gives promising yield as 5-10 percent higher than as yield of the favorite high yielding variety, SPR1. In the experiment station, it yielded 745 Kg/Rai and showed average yield of 738 Kg/Rai when broadcasted in the farmer's field yield trials while SPR1 showed 705 and 708 Kg/Rai, respectively. Its paddy hull was awnless, straw color, slender shape with the grain size of 10.48*2.60*2.07 mm. Its brown rice grain size was 7.39*2.13*1.84 mm. with white color, less chalkiness (0.54), 27.3-29.8 percent amylose content. Its cooking quality was intermediate gel temperature, soft gel type, normally elongated cooked grain. Its good advantages were resistance to white back plant hopper, moderately resistance to brown plant hopper, moderately resistance to bacterial leaf blight, brown spot and dirty panicle. Its disadvantages were moderately susceptible to leaf blast, susceptible to ragged stunt virus and yellow orange leaf virus. It performed well response to nitrogen fertilizer applications at the rates of 12 to 30 Kg N /Rai given highest yield of 989 Kg/Rai at the rate of 24-6-6 Kg N-P2O5-K2O per Rai. It should be recommended for irrigated area of the Central region.