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Carbon dioxide is produced by microbial and plant respiration and accumulates in the soil. In previous field studies, CO 2  levels were higher under a killed sod soil management system, relative to cultivation and herbicide systems (1.8 vs 0.8 and 1.0%), respectively. Our objective in these studies was to measure the effect of elevated levels of root system CO 2  on root and shoot growth and nutrient uptake. Using soil and hydroponic systems in greenhouse studies, we maintained root system CO 2  levels between 1.5 and 2.5%. Control CO 2  levels were less than 1%. Root length density and dry matter partitioning to the root system were increased by root CO 2  in soil and hydroponic studies; shoot growth was unaffected. In hydroponic culture, root CO 2  increased P uptake, solution pH, root volume and the number of lateral roots/cm root axis. Elevated levels of CO 2  in the root system stimulated root growth in both the soil and hydroponic studies.

ROOT CO2 EFFECTS ON THE PEACH ROOT SYSTEM