Chemical composition of sweet potato roots at different stages of growth

Date

1973

Degree

Bachelor of Science in Agricultural Chemistry

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Lilia S. P. Madamba

Abstract

CHEMICAL COMPOSITION OF SWEET POTATO ROOTS AT DIFFERENT STAGES OF GROWTH

NORMA DE MESA NATIVIDAD

ABSTRACT

The effect of stage of growth (time of sampling), variety, and level of nitrogen fertilization on the moisture, protein, sugar, and starch contents of sweet potato roots was determined in two varieties of sweet potato, namely, "Taiwan" and "Georgia Red". Significant changes in chemical composition of the roots were observed at different stages of growth. For both varieties, the moisture, protein, and sugar contents decreased while the starch content increased as the roots grow older. Protein was found in greater amounts in "Georgia Red". "Taiwan" had higher sugar content than "Georgia Red". While greater amounts of starch were observed in "Georgia Red" in the first stage of growth, the reverse was noted in the last two stages. A highly significant interaction between variety and level of nitrogen fertilization was observed to affect protein, sugar, and starch contents. Protein and starch contents were higher in samples grown under a high level of nitrogen fertilization. Sugar content, on the other hand, was higher in samples grown under a lo level of nitrogen fertilization. Although both varieties were found to be significantly affected by the interaction of variety and level of nitrogen fertilization, "Georgia Red" showed better response to nitrogen fertilization. As regards sugar and starch contents, the variety-stage of growth interaction was more pronounced in "Taiwan".

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

LG 993.5 1973 A13 N38

Document Type

Thesis

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