Performance of Selected Philippine Traditional Lowland Rice Varieties Under Varying Environment and Cultural Practices

Date

3-1990

Degree

Bachelor of Science in Agriculture

Major Course

Major in Agronomy

College

College of Agriculture and Food Science (CAFS)

Adviser/Committee Chair

Jose E. Hernandez

Abstract

One hundred ninety two traditional varieties obtained from the International Rice Germplasm Center were grown in two planting dates – August and October 1987 using systematic plot arrangement design. The first planting used one plant per hill and was subjected to no insect and disease control while the second planting used three plants per hill with appropriate pest control measures. Fertilizer rate for both plantings was 46-30-30 kg NPK/ha. Data gathered were subjected to sample variance analysis, frequency distribution and cluster analysis.

Data on all morpho-agronomic characteristics except for days to heading were observed to be similar for both plantings.

Sixty-four varieties were semi-dwarf (<= 90 cm). Only 35% of the varieties had erect leaves while the rest had horizontal leaf orientation. Most varieties had less than 10 productive tillers per hill. Long panicles (=> 25 cm) observed in 10% of the varieties and well-exerted panicles in 64% of the varieties were the desirable attributes of the traditional varieties. Moreover, 30 varieties were found to have field resistance to both rice tungro virus and sheath blight disease. Lodging resistance was exhibited by 31% and phenotypic acceptability rating considered 20.6% as useful for breeding purposes or as a commercial variety. The yields were generally low although high yields were obtained from Campena (3,830 kg/ha), Bulilising (Diket) (2,949 kg/ha), Bakhaw (2,946 kg/ha), Inuwak (2,485 kg/ha) and Sinoan 1 (2,150 kg/ha). These varieties are medium tall (100-135 cm) and late maturing (137-159 days). Except for Bakhaw all are resiatnt to the rice tungro virus.

Days to heading, plant height and days to maturity were found to be highly variable among the varieties. The 100-grain weight was observed to have very low variability.

Cluster analysis of Statistical Analysis System grouped the varieties into eight arbitrary clusters. Cluster means of 14 characters showed that the number of days to heading, plant height and maturity period contributed largely to genetic divergence. However, not all the 20 promising varieties were found in one cluster but instead were distributed in six of the eight clusters.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

LG 993.5 1990 A42 R34

Document Type

Thesis

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