Indian Institute of Horticultural Research, Hessaraghatta, Bangalore, 560 089
Spatial distribution of root activity in kagzi lime (Citrus aurantifolia, Swingle) was studied using radioactive 32P soil injection technique during two seasons. Results indicated that during early and late rainy seasons, most of the root activity was surface oriented and as much as 80 to 95 per cent was located in the top 10 cm layer of the soil. About 75 to 80 per cent of the root activity was also confined within a radial distance of 120 cm. These results indicate that in kagzi lime, the zone of effective nutrient uptake was located in the top 10 cm layer of the soil and that placement on the surface within a radial distance of 120 cm would result in better utilization of the applied fertilizer.
