Satisfying and altering edaphic requirements for acidophilic plants

Abstract

Recent work on the soil/root interface has increased our understanding of fundamental mechanisms of ion uptake and responses to edaphic situations. Although there still remain many areas where our knowledge is scant, most of this work to date has used agronomic crop species as test plants. A significant family of plants for horticulturists is the Ericaceae which contains the ornamentally important azaleas and rhododendrons (Rhododendron spp.) plus the edible‐fruit‐bearing blueberry (Vaccinium spp.) and cranberry (V. macrocarpon L.). These plants are known for their “acid‐loving”; character, sensitivity to fertilizer input and specific edaphic requirements. This review presents a basic understanding of the root system of these acidophilic plants from the aspect of ion‐stress response, particularly calcium, manganese and aluminum nutrition, and the role of organic amendments. This information will not only add to our store of knowledge but also enable us to adapt these species to unique edaphic situations which will increase their productive range.

Key words:

• Acid‐loving plants
• calcicole
• calcifuge
• Ericaceae
• Vaccinium spp.