Effect of Nitrogen and Shading Dosage on Phenolic Compounds in Guava Leaves
Date Issued
2009
Date
2009
Author(s)
Hung, Yu-Hsiang
Abstract
Guava (Psidium guajava L.) leaves were supported by some studies that the curative effects, such as anti-cough, antidiabetic, anti-inflammatory, antimicrobial, anti-diarrhea, intestinal anti-spasmodic, and anti-fever may be effectual. The health drink of guava leaves entered the market in Korea and Japan. It is a highly profitable business of Taiwan to export guava leaves. The traditional cultivation of guava were proposed to produce fruits and ignored those conditions for producing leaves. The sun weathering processing method and 80% methanol were suggest to extract more phenolic compounds from guava leaves. Field experiment of two factor, which were nitrogen and shading dosage, were hold to test the phenolic content in guava leaves. There are no significant difference between treatment of nitrogen dosage. The more shading would gain the less phenolic content. We could estimate the total phenolic content per dry weight (TPCDW) by a regression model, which is TPCDW = 104.1589 - 0.624 N - 8.3517 P - 0.7065 K - 1.3997 Ca + 7.1919 Mg + 0.1685 Fe + 0.068 Mn + 0.2327 Zn.
Subjects
guava leaves
shading
nitrogen
phenolic compounds
SDGs
Type
thesis
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