Pattern of ammonia volatilization losses from spent mushroom compost and farm yard manure amended soil.

摘要

A laboratory experiment was conducted to investigate the effect of spent mushroom compost (SMC) and FYM on ammonia volatilization losses in sandy loam soil. The treatments consisted of three types of organic amendments (WB-SMC, Dhingari-SMC and FYM) applied at the rate of 0.75% on soil weight basis. Then, urea at 100 mg N/kg soil was surface applied. A control treatment which received no organic amendment and no fertilizer was also run. NH₃ volatilization losses from applied urea in soil increased upto 3 days following urea application and then gradually decreased upto 7 days and thereafter, the per day losses were never more than 1% of the applied N at any time upto 28 days. More than 95% of the total NH₃ volatilization losses occurred during the first week following urea application. In the control, about 30% of the applied N was lost due to NH₃ volatilization in 28 days. The losses were significantly reduced with the addition of SMC and FYM in soil.