Integrated nutrient management on medicinal coleus and soil nutrient status

摘要

A field experiment was conducted on medicinal coleus (Coleus forskohlii Briq) (K-8) at Herbal Garden, Rajendranagar, Hyderabad on a fine loamy, mixed hyperthermic, Typic Haplustept soil during late kharif 2005-06 to study the effect of organic manures (different doses of castor cake, FYM), bio-fertilizer (Azospirillum, Phosphorus solubilizing Bacteria) and inorganic nitrogenous fertilizer (different levels) on tuber yield at harvest and soil nutrient status at different growth stages (90, 120 DAP and at harvest). Conjunctive use of 50% N (20 kg N/ha) with organic manures (FYM @ 2.5 t/ha+castor cake @ 0.25 t/ha) and bio-fertilizers (T-12) has resulted in the highest fresh tuber yield (121.91 t/ha), dry tuber yield (21.59 q/ha) at harvest and soil nutrient status (available N, P, K, S and Fe) at all the growth stages studied. This treatment was found to be on par with 100% N (T-3) indicating saving of 50% N through conjunctive use of organic manures and bio-fertilizers with inorganic N in addition to improving the soil fertility status.