Abstract
Abstract Nutrient availability in the rhizosphere differs in many respects from that in the bulk soil. Factors of major importance for the mineral nutrition of plants are root‐induced changes in rhizosphere pH, in reducing capacity of the roots, and in amount and composition of root exudates. These changes are in many instances root‐responses to the nutritional status of plants. Examples are given for zinc, iron, and phosphorus nutritional status in plants. Changes in nutrient availability in the rhizosphere may also be a consequence of alterations in the rhizosphere microflora. Root‐induced changes are important components for the adaptation of plants to extreme chemical soil conditions and for efficient use of soil and fertilizer nutrients.
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