A Long Term Soil FertWty experiment has heen conducted since 1987188 to study the sustainability ofsoilfertility and productivity of the rice-wheat system under Khajura (Western Terai) conditions. Response to supplement phosphorous (P) was seen in later years of the experiment in rice, whereas in wheat, response to P was observed from the initial years. A residual effect of FYM was seen in rice. The highest grain yield (3634kglha) of rice was observed in treatment 5(100:30:30 NPK) Treatment 5 also produced highest mean grain yield in wheat (2556 kg/ha. The main grain yields of T2 ( 100:00:0), T3(100:30:00) and T4 (100:00:30) NPK kglha were comparable in both rice and wheat. The combine effect ofP and K on wheat yield greater the effect of either. By comparison P and K application had no significant effect on rice yield Nitrogen is very important for both rice and wheat. Phosphorous and Potassium some what important for rice (at low nitrogen) Phosphorous and Potassium more important .for what (at all N levels). Role of the FYM in rice greater than F_YM in wheat. The similar results were obtained in mean straw yield, plant height , panicle length, grain/spike and no. c ftillers and 1000 grain weight. The average available P205 (83.8kglha) and K20 contain (60kglha) in soil was observed to decline over the study period Total nitrogen and organic matter content increased with the application of FYM/compost (I 0 tlha)

A Long Term Soil FertWty experiment has heen conducted since 1987188 to study the sustainability ofsoilfertility and productivity of the rice-wheat system under Khajura (Western Terai) conditions. Response to supplement phosphorous (P) was seen in later years of the experiment in rice, whereas in wheat, response to P was observed from the initial years. A residual effect of FYM was seen in rice. The highest grain yield (3634kglha) of rice was observed in treatment 5(100:30:30 NPK) Treatment 5 also produced highest mean grain yield in wheat (2556 kg/ha. The main grain yields of T2 ( 100:00:0), T3(100:30:00) and T4 (100:00:30) NPK kglha were comparable in both rice and wheat. The combine effect ofP and K on wheat yield greater the effect of either. By comparison P and K application had no significant effect on rice yield Nitrogen is very important for both rice and wheat. Phosphorous and Potassium some what important for rice (at low nitrogen) Phosphorous and Potassium more important .for what (at all N levels). Role of the FYM in rice greater than F_YM in wheat. The similar results were obtained in mean straw yield, plant height , panicle length, grain/spike and no. c ftillers and 1000 grain weight. The average available P205 (83.8kglha) and K20 contain (60kglha) in soil was observed to decline over the study period Total nitrogen and organic matter content increased with the application of FYM/compost (I 0 tlha)