Abstract:
'lhe study was conducted to evaluate effectiveness of Bio fertilizer and combined
inorganic ferttltzer on growth and yield of radish. Tkre experiment was carried out
during December to March 2025 at the Facult,v of Technology, Eastern University, Sri
Lanka. The study was designed with five treatment and ten replicates. Treatments are
Tr-(Control); Recommended amount of chemical fertilizer by Department of
Agriculture (RDOA), T2- 712 RDOA of urea *Recommended amount of Triple super
phosphate and Muriare of potash +25}mlha Bio fertilizer, T3 - 1/2 RDOA of urea -f
TSP&MOP + 500m1/ha Bio fertllizer, T4- Il2 RDOA of urea + TSP & MOP +
750mVha Bio fertilizer, T5- ll/ha Bio fertilizer alone. All other agronomic practices
were followed based on DOA recommendation. Plant height, number of leaves, leaf
area were measured in weekly interval. Fresh weight of leaf cutting, dry weight of leaf
cutting, tuber length, tuber diameter, fiesh weight and dry weight of tuber were
measured at the time of harvesting (6th Week after planting). Analysis of variance was
performed to determine significant difference among treatment (p<0.05).The results
revealed that treatments combining inorganic fertilizers with biofertilizers (T3 and T+)
significantly enhanced plant growth and tuber yield compared to inorganic fertilizers
alone (Tr) as well as biofertilizers alone ('Is). The highest tuber yield was observed in
T+, demonstrating the effectiveness of biofertilizers in improving nutrient uptake, root
elongation, and soil microbial activity. These findings suggest that integrating
biofertilizers with inorganic fertilizers can enhance radish productivity whiie reducing
the environmental impact of excessive chemicalfertllizer use. The study highlights the
potential of biofertilizers as a sustainable approach to improving soil fertility and crop
yield.
