Study on Long-Term Fertility Experiment on Yield and Yield Attributes of Wheat at Parwanipur, Bara

: A long-term fertility trial is continuously being conducted at Directorate of Agricultural Research, Madhesh Province, Parwanipur, Bara, Nepal since 1980. The experiment included two crops per year, rice (July–November) and wheat (December-April), with twelve treatments arranged in a randomized complete block design and three replications. As a continuity of the research, wheat was sown at Parwanipur during year 2021 and 2022 in an individual plot size of 6m length and 4 m width maintaining rows at 25 cm apart with seed rate of 120 kilograms per hectare (kg/ha). Early maturity of wheat crop was observed in treatment applied with 100:30:30 NPK kg/ha with residual ZnSO 4 from rice crop. Similarly, the same treatment applied with 100:30:30 NPK kg/ha with residual ZnSO 4 from rice crop resulted the highest yield among the treatments followed by the treatment consisting addition of 50 kg N per hectare on rice and residual FYM with 100:30:30 NPK kg/ha in both year of wheat cultivation. Hence, for wheat cultivation either application of inorganic fertilizer alone or application FYM only was not found sufficient to obtain stable higher yield, as crop responded to balanced used of fertilizer.