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008			110920s1988 th uu|m rtt 0| a1eng d
035			_a.b10099219
099		9	_aAIT Thesis no.AE-88-38
100	0		_aChanpithya Shimphalee
245	1	0	_aAssessment of rice varieties and methods of establishment under rainfed conditions in Ban Na, Nakhon Nayok
260			_aBangkok : _bAsian Institute of Technology, _c1988
300			_a84 p.
490	1		_aThesis ; _vno. AE-88-38
500			_aA thesis submitted in partial fulfillment of the requirements for the degree of Master of Science, School of Environment, Resources and Development
502			_aThesis (M.Sc.) - Asian Institute of Technology, 1988
520			_aA 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.
650		0	_aRice _zThailand _zNakhon Nayok _xPlanting
700	1		_aPeacock, Christabel P., _eChairperson
700	1		_aGartner, Joseph A., _eExamination Committee
700	1		_aDemaine, Harvey, _eExamination Committee
710	2		_aFAO/UNDP, _eScholarship Donor
810	2		_aAsian Institute of Technology. _tThesis ; _vno. AE-88-38
856			_3Full-Text _uhttp://203.159.5.9/ait-thesis/detail.php?q=B18941
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