Soil and plant samples were taken from tropical fruit tree plantations, temperate fruit tree orchards and vegetable gardens grown using organic agricultural methods in Tenerife. Micronutrients Cu, Fe, Mn, and Zn were determined. The micronutrient content of most soils was found to fall within the normal range reported in the literature. Mn was present at low levels in the foliage of many plants, and a negative correlation between foliar Mn and soil organic matter content was observed in avocado and banana plantations. Consequently, maximum levels of soil organic matter content are established for avocado and banana. Cu, Fe, and Zn were also deficient in leaves of some plants.