Mineral Composition and Soil-Plant Relationships for Common Guava (Psidium guajava L.) and Yellow, Strawberry Guava (Psidium cattleianum var. lucidum) Tree Parts and Fruits

The mineral composition of common guava, Psidium guajava L., and strawberry guava, Psidium cattleianum var. lucidum fruit and tree parts was determined. The study occurred during three seasons at six locations in Hawaii to assess guava as feed for livestock. Guava bark contained the greatest concentrations of calcium (Ca) and ash; guava leaves the greatest concentrations of magnesium (Mg), sulfur (S), sodium (Na), boron (B), and manganese (Mn), while the shoots had the greatest concentrations of nitrogen (N), phosphorus (P), and potassium (K). The leaves and the shoots had the greatest concentrations of copper (Cu) and iron (Fe). Between guava and waiwi, guava had greater concentrations of most minerals except for Na in all plant parts, and Mg and ash in the leaves. Guava leaves and shoots meet the macro-mineral requirements for various phases of sheep, goat, and beef cattle life cycles with the exception of P and Na. Guava shoots do not meet Mn requirements for lactating cows.