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008			070730s19uu xx 00 eng d
040			_cCvSU Main Campus Library
041	0		_aeng
082	0	4	_a635.655 _bB31 1978
100		0	_aBuajarern, Withya _912872 _eauthor
245	1	0	_aSelection criteria for soybeans under varying cropping system and environments / _cby Withya Buajarern
260	0		_aLos Baños, Laguna : _c1978. _bCavite State University- Main Campus,
300			_a97 pages : _c28 cm. _billustrations ;
336			_2rdacontent _atext
337			_2rdamedia _aunmediated
338			_2rdacarrier _avolume
500			_aThesis (PhD--Agronomy) University of the Philippines.
504			_aIncludes bibliographical references.
520	3		_aBUAJARERN, WITHYA, University of the Philippines at Los Banos, June, 1978, Selection Criteria for Soybeans under Varying Cropping Systems and Environments. Major Professor: Dr. Arturo A. Gomez. Twenty-four soybean varieties were grown under five growing conditions, namely; lowland mulched following rice dry season, upland open wet season, upland shaded wet season, upland open dry season, and upland shaded dry season, to determine the responses and adaptability of these varieties to changes in growing conditions, to study the genotypic and phenotypic correlations between yield and certain characters, and to establish criteria in selecting for maximum bean yield under various growing conditions. The major sources of variation in characters and yield were largely due to the main effects of varieties and growing conditions, and the interaction between variety and growing conditions. Average bean yield over all varieties was highest under the open wet season planting, and lowest under the shaded dry season planting. Among the varieties, UPL-SY 2 produced the highest bean yield, followed by Kaohsiung #3, and Williams. Hill and Lincoln, on the other hand, produced the lowest yields. O£ the twenty-four varieties, none of them could be identified as ideal variety having general adaptability and maximum phenotypic stability. UPL-SY 2, Kaohsiung #3, Tainung #4, and Clark 63 were well adapted to all environments, but these varieties exhibited low phenotypic stability. Wayne, L-114, and #29, on the other hand, exhibited high phenotypic stability but produced low yields. The correlation’ between yield and other characters were not consistent from one environment to another, suggesting that the selection criteria for different environments need not be the same. Further analysis however, showed close similarity in performance between shaded and open environment while that at the lowland deviated substantially. These results suggest that a separate performance test, both in the preliminary and advanced trials, should be conducted for developing varieties to be planted after lowland rice. On the other hand, a common preliminary trial can probably serve both upland open and upland shaded conditions.
541			_cSubmitted to the University Library _d01-07-1994 _eT-1487
650		0	_aSoybean _911824
690			_91418 _aDoctor of Philosophy _xAgronomy
856			_yClick here to view thesis abstract and table of contents _uhttp://library.cvsu.edu.ph/cgi-bin/koha/opac-retrieve-file.pl?id=6430a889301f16ee694303c1c8178298
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