MICRONUTRIENTS IN SOILS AND PLANTS FROM ORGANIC FARMS OF TENERIFE (CANARY-ISLANDS)

Soil and plant samples were taken from tropical fruit tree plantations , temperate fruit tree orchards and vegetable gardens grown using orga nic agricultural methods in Tenerife. Micronutrients Cu, Fe, Mn, and Z n were determined The micronutrient content of most soils was found to fall within the normal range reported in the literature. Mn was prese nt at low levels in the foliage of many plants, and a negative correla tion 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.