03749cas a2200385 a 4500 20260817163634.0 110920s1988 th uu|m rtt 0| a1eng d .b10099219 AIT Thesis no.AE-88-38 Chanpithya Shimphalee Assessment of rice varieties and methods of establishment under rainfed conditions in Ban Na, Nakhon Nayok Bangkok : Asian Institute of Technology, 1988 84 p. Thesis ; no. AE-88-38 A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science, School of Environment, Resources and Development Thesis (M.Sc.) - Asian Institute of Technology, 1988 A farm trial on rainfed rice cultivation was carried out in Village No.10, Khao Perm sub - district, Ban Na district, Nakhon Nayok province after the existing farming systems had been d escribed and the problems identified. Three de signs for rice improvement were continually adapted to match the changing environmental conditions. The first design concerned fertilizer trial for rice cultivation but it had to be adapted due to low and late rainfall. Th e second design was arranged to cope with the low and l ate rainfall by comparing field crops and dry seeded rice cultivation . However , heavy rain in September made it impossible to carry on the trial and the final design was made to test three rice varieties namely Khao Puang, RD27 and RD7. Two methods of establishment, direct seeding and trans planting, we re used for RD7. Despite severe aridity, the newly introduced RD27 was superior to the others in terms of grain yield ( 240 kg/rai). Khao Puang, RD7 ( transplanted) and RD7 (direct seeded) had yields of 2 16, 204, and 196 kg/rai respectively . Khao Puang produced the highest straw yield (40-0 kg/rai). RD27, RD7 (transplanted ) and RD7 (direct seed e d) contributed straw yields of 391, 365 and 330 kg/rai respectively . RD7 and RD27 after milling gave head rice of 61.3% a nd 60 . 1% which is higher than Khao Puang ( 5 4.6%). RD27 ha d a higher gross margin of 469 baht/rai and RD7 (direct seeded ) followed with 446 baht/rai . RD7 (transplanted) provide d 354 baht/rai and Khao Puang had 346 baht/rai. Most farmers were like l y to accept RD27 but further verification trials to test its suitability to the environment under a wide range of conditions must be carried out. In times o f .low and late rain, non-photosensitive rice varieties are not necessarily better than photosensitive varieties. Direct seeding was not the usual method of rice growing in the area and farmers agreed to utilize only in case of severe drought when trans planting could not take place. Rice Thailand Nakhon Nayok Planting Peacock, Christabel P., Chairperson Gartner, Joseph A., Examination Committee Demaine, Harvey, Examination Committee FAO/UNDP, Scholarship Donor Asian Institute of Technology. Thesis ; no. AE-88-38 Full-Text http://203.159.5.9/ait-thesis/detail.php?q=B18941 .b10099219 mnait s 240411 2 951012 m a s 0 mnait mnarc 22 40 Barcode : 30050120581821 CREATED : 2014-07-02 RECORD # : i12759429 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050120364913 CREATED : 2016-05-27 RECORD # : i12997171 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 9317 9317 0 0 0 0 MAIN MAIN mnait 2026-08-17 50.00 0 AIT Thesis no.AE-88-38 30050120581821 2026-08-17 16:36:34 3 2026-08-17 22 0 0 0 0 MAIN MAIN mnarc 2026-08-17 0 AIT Thesis no.AE-88-38 30050120364913 2026-08-17 16:36:34 2026-08-17 40