%O The authors thank the late Dr. K. C. Gulati, Emeritus Scientist (LC.A.R.) for suggesting this problem, and the Heap, Division of Agricultural Chemicals, LA.R.I. for providing necessary laboratory facilities. K. L. Sahrawat thanks the LC.A.R. for providing felloship during the tenure of this work %A K L Sahrawat %A B S Parmar %I Indian Society of Soil Science %V 23 %L icrisat4513 %J Journal of the Indian Society of Soil Science %N 1 %P 131-134 %D 1975 %X After removal of the ethanol solvent, the extractive, which is rich in lipid associates, was incubated in soil with 200ppm NH4-N at rates of 5 to 30% of the NH4-N. NH4-N was supplied by ammonium sulphate and urea. Inhibition of nitrification depended on the amount of the seed extract applied and on time of incubation; application at 30% of the NH4-N was effective up to 75 days. %T Alcohol Extract of Neem (Azadirachta indica L.) Seed as Nitrification Inhibitor