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Selection criteria for soybeans under varying cropping system and environments / by Withya Buajarern

By:

Buajarern, Withya [author]

Material type: Text

TextLanguage: English Publication details: Los Baños, Laguna : 1978. Cavite State University- Main Campus,Description: 97 pages : 28 cm. illustrationsContent type:

text

Media type:

unmediated

Carrier type:

volume

Subject(s):

DDC classification:

635.655 B31 1978

Online resources:

Click here to view thesis abstract and table of contents

Abstract: BUAJARERN, 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.

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Holdings ( 1 )
Title notes ( 4 )

Holdings
Item type	Current library	Collection	Call number	Materials specified	URL	Status	Notes	Date due	Barcode
Theses / Manuscripts	Ladislao N. Diwa Memorial Library Theses Section	Non-fiction	635.655 B31 1978 (Browse shelf(Opens below))		Link to resource	Room use only	T-1487		00007076

Thesis (PhD--Agronomy) University of the Philippines.

Includes bibliographical references.

BUAJARERN, 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.

Submitted to the University Library 01-07-1994 T-1487