performance of nitrogen phosphorus compound fertilizer in boro rice

Objective: evaluation of new nutrient sources plays an important role in crop production. a field experiment was conducted at brri, gazipur and at brri regional station, sonagazi, feni during boro season of 2014-15. a new fertilizer, np compound (npc) was evaluated and compared the performances with di-ammonium phosphate (dap). test crop was brri dhan29. at gazipur site, phosphorus (p) control plot produced only 1.97 t ha^-1 grain yield that increased with added p along with two n rates. at lower n doses, application of p either from dap or npc produced similar grain yield. it was observed that 30% less n produced statistically similar grain yield to 100% n, irrespective of p sources. it can be inferred that 30% n could be saved without significant reduction of rice yield. at sonagazi site, application of p either from dap or npc could not increase rice grain yields compared to p control plot. from the results of both sites it can be concluded that npc and dap performed equally either with 100% n or 30% less n rates.