Yiel ) The Study Potential Cassava Varieties Progress in Lop-Buri province, Thailand Pacharada Chaisri (1) Ed Sarobol (2) Kingkan Panitnok (3) Sakol.

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Yiel ) The Study Potential Cassava Varieties Progress in Lop-Buri province, Thailand Pacharada Chaisri (1) Ed Sarobol (2) Kingkan Panitnok (3) Sakol Chaisri (1)Nittaya Dontree(1) (1) Lop Buri Research Station, Kasetsart University, Kok-Charoen, Lop-Buri, Thailand, 15250 (2) Department of Agronomy, Faculty of Agriculture, Kasetsart University,Bangkok, Thailand, 1090 (3) Khao Hin Son Research Station, Kasetsart University, Phanom Sarakham, Chachoengsao, Thailand, 24120 * correspondence e-mail : rdipnc@ku.ac.th INTRODUCTION ABSTRACT The yield trial for evaluation of suitable casava lines cultivars for cultivated conditions of Lop-Buri province by using 4 recommended cassava cultivars (Sriracha1, KU 50, HB 60 and HB 80 ) and 16 elite line from Kasetsart cassava Breeding Project (MKULB 08-2-9, MKULB 08-2-13, MKULB 08-2-19, MKULB 08-2-22, MKULB 08-2-32, MKULB 08-2-39, MKULB 08-2-45, MKULB 08-2-49, MKULB 08-2-52, MKULB 08-2-58, MKULB 08-2-12, MKULB 08-2-62, MKULB 08-2-65, MKULB 08-2-68, MKULB 08-2-72 and MKULB 08-2-77) as conducted at the Lop-Buri research station field with 3 replication was conducted in February 2010 – March 2011 and April 2011- March 2012. The results revealed that line MKULB 08-2-32, KU 50, and HB 80 gave highest yield per hectare (50.94, 45.63, 44.31 t/ha) while MKULB 08-2-65, MKULB 08-2-32, HB 60 gave highest yield per stem (6.67, 5.59 and 5.06 kg/stem) and HB 60, MKULB 08-2-13, KU 50, SR 1, MKULB 08-2-22, HB 80, MKULB 08-2-39, MKULB 08-2-62 and MKULB 08-2-32 gave root starch content highest (25.22, 25.07, 24.96, 24.62, 24.33, 23.49 and 23.07 % respectively) In 2011/12, Thailand had the harvest area of cassava about 1,178,790 hectare and had the total yield about 25,107,758 ton. In 2009, Thiland had the average yield of 22.68 ton/hectare, while the average yield in 1990 of 13.72 ton/hectare. The 20 years ago, the average yield increase about 8.96 ton/hectare. ( Office of National Economy, 2533,2554,2555). However, the Lop-Buri province had harvested area 21,858.44 hectare and had the average yield of 15.34 ton per hectare (http://www.oae.go.th., 2012) Howeler et al. (2000) reported that the average yield of Asia was 2.30 ton per rai (14.37 ton per hectare). The average yield per area will be increase, if the new cassava varieties can adaptation and giving the high yield. So “The Study Potential Cassava Variety Progress in Lop-Buri province, Thailand ” was to evaluate the high potential cassava Variety Progress grown on Lop-Buri province. อุปกรณ์ และวิธีการ RESULTS Table 1 Mean of yield and component yield of 20 cassava lines/varities grown in Lop-Buri station (23/2/10-25/2/11 and 25/3/11- 27/3/12) Varieties/Lines Yield/h (ton) Yield/pl (kg) % Starch No. root/pl H- HV (cm.) HV-index MKULB 08-2-9 29.38c 19 3.41d 21.73b 10.70 265.67 0.513 MKULB 08-2-13 36.19c 10 3.90c 25.07 a 16.33 243.67 0.607 MKULB 08-2-19 33.31c 15 3.77c 20.40 bc 13.70 239.42 0.534 MKULB 08-2-22 39.44bc 7 4.45c 24.62 ab 14.00 273.83 0.636 MKULB 08-2-32 50.94a 1 5.59b 23.07 ab 11.22 232.42 0.587 MKULB 08-2-39 38.06bc 8 4.43c 24.60 ab 15.98 201.92 0.521 MKULB 08-2-45 41.88bc 4 4.50c 22.48 b 11.93 205.50 0.712 MKULB 08-2-49 41.00bc 6 4.20c 21.72 b 11.58 272.30 0.619 MKULB 08-2-52 35.38c 12 3.35d 17.80 c 10.27 209.08 o.514 MKULB 08-2-58 37.31bc 9 3.60c 20.07 bc 12.97 271.67 0.612 MKULB 08-2-12 24.00d 20 1.99d 22.37 b 8.43 315.50 0.341 MKULB 08-2-62 35.81c 11 3.01d 23.48 ab 10.95 310.42 0.509 MKULB 08-2-65 34.88c 14 6.67a 19.88 bc 10.45 288.83 0.427 MKULB 08-2-68 30.69c 18 2.91d 20.03 bc 9.43 266.17 0.463 MKULB 08-2-72 35.19c 13 3.23d 20.78 bc 15.05 225.50 0.451 MKULB 08-2-77 31.25c 17 3.40d 19.63 c 10.47 0.508 HB 80 44.31ab 3 3.62c 24.33 ab 13.58 263.08 0.566 HB 60 41.38bc 5 5.06b 25.22 a 11.63 302.17 0.627 KU 50 45.63ab 2 4.44c 24.96 a 17.58 278.75 0.562 SR 1 37.06bc 16 3.95c 24.73 ab 15.43 257.87 0.589 Mean 37.13 3.86 22.35 12.59 0.545 F-test T ** F- test L ns F-test TxL * LSD % 8.69 0.98 2.71 2.69 66.23 0.114 CV % 22.3 22 10.60 18.6 15.8 12.9 Figure 1 Rainfal in 2010 and 2011 (mm). Figure 2 Number of rainy days in 2010 and 2011. ns 1/ = not significant at P < 0.05 * and ** = P < 0.05, P < 0.01, respectively 1/ Means in the same column followed by the same letter(s) are not significant different at P < 0.05 by Fisher’s LSD CONCLUSION Statistically significant differences in fresh root per area, percentage of starch content, number of root per stem were found that the MKULB 08-2-32, KU 50 and HB 80 gave highest fresh root yield per area (50.94, 45.63 and 44.31 ton per hectare) and gave highest percentage of starch content (23.07, 24.96 and 24.33 %) In addition, MKULB 08-2-32, KU 50 and HB 80 gave quite high in high of stem and harvest index too. REFERENCE Department of Agriculture. 2004. Academic Document of Cassava. Field Crop Research Institute, Department of Agriculture, Ministry of Agriculture and Cooperatives. 124 pages. (In Thailand). H. Howeler and Clair H. Hershey. 2000. Cassava news. 2011. http:// cassavanews.blogspot.com/Reinhardt http://ciat-library. Ciat. Cgiar.org/articulos-ciat/0201- research-development-cassava.pdf- Lop-Buri Research Station. 2010 and 2011. Statistics of Rainfall. Kasetsart University. (InThanland) Office of National Economy. 1909,2011,2012. Statistics of Agriculture. Thailand Acknowledges This project was financially supported by Kasetsart University Research and Development Institute(KURDI).