A long-tenn soil fertility experiment in rice-wheat system was started in 1980 on slightly acidic loam soils of Regional Agricultural
Research Station, Parwanipur to study the effects of different combinations of organic and inorganic sources of nutrients on crop
yield and soil properties. The experiment comprised twelve different treatment combinations of inorganic N, p and K, and farm yard
manure (FYM) and wheat chopped straw (WCS) in a randomized complete block design. Recent yield data indicated the use of 10 t
FYM along with 50 kg of inorganic N ha-1 produced consistently highest rice yield from 2004 to 2006. The combined use of
inorganic N, P and K application was more pronounced with advancement of years, but failed to produce significantly higher grain
yield over minus P K, minus P and minus K treatments. A sharp decline rice yields was noted in minus P treatment during year
2006. The soil analysis data showed an increase in soil organic carbon, available phosphorus and total nitrogen in FYM and WCS
amended plots. Soil acidity was not increased over except in the plots treated with inorganic N only.

A long-tenn soil fertility experiment in rice-wheat system was started in 1980 on slightly acidic loam soils of Regional Agricultural
Research Station, Parwanipur to study the effects of different combinations of organic and inorganic sources of nutrients on crop
yield and soil properties. The experiment comprised twelve different treatment combinations of inorganic N, p and K, and farm yard
manure (FYM) and wheat chopped straw (WCS) in a randomized complete block design. Recent yield data indicated the use of 10 t
FYM along with 50 kg of inorganic N ha-1 produced consistently highest rice yield from 2004 to 2006. The combined use of
inorganic N, P and K application was more pronounced with advancement of years, but failed to produce significantly higher grain
yield over minus P K, minus P and minus K treatments. A sharp decline rice yields was noted in minus P treatment during year
2006. The soil analysis data showed an increase in soil organic carbon, available phosphorus and total nitrogen in FYM and WCS
amended plots. Soil acidity was not increased over except in the plots treated with inorganic N only.