The field experiments were conducted during the rice seasons of the three years (2064,

2065 and 2066) in Rampur, Chitwan to recommend optimal level of potassium for better
and sustainable rice grain production under Rice-Wheat cropping system. Randomized
complete block design (RCBD) was used with seven treatments of potassium levels (0, 15,
30, 45, 60, 75 and 90 kg K20 ha-l) with four replications. The plot size was laid out 12m2.
The Ram Dhan variety was selected for the study area of Chitwan valley. The highest rice
grain production (524lkg ha-l), plant height growth (104.5 em), number of tillers (267) and
straw weight (7067 kg ha-l) were recorded in treatment six (T6: 100:30:75: N: P205: K20
kg ha-l) in the first year (2064). Statistically, both grain and straw yield were found
significantly higher as compare to treatment two (T2: 100:30:15: N: P205: K20 kg ha-l).
In second year, the highest rice grain (3875kg ha-l) and straw (4376 kg ha-l) yield was
obtained from treatment five (T5: 100:30:60:N: P205: K20 kg ha-l). In three years
research period, the highest rice grain (4304 kg ha-l) was produced by the treatment five
(T5). Similarly, the highest straw yield (5106kg ha-l) was obtained by treatment six (T6).
Three years field experiment reveals 60 kg .K20 ha-l recommendation could be sustainable
rice production under rice wheat cropping system of light textured soil. The experimental
results also indicated a depleting trend of inherent soil potassium due to several factors such
as intensive cultivation, leaching losses ·and imbalance use of potassium containing
fertilizers in the cropping systems.

The field experiments were conducted during the rice seasons of the three years (2064,

2065 and 2066) in Rampur, Chitwan to recommend optimal level of potassium for better
and sustainable rice grain production under Rice-Wheat cropping system. Randomized
complete block design (RCBD) was used with seven treatments of potassium levels (0, 15,
30, 45, 60, 75 and 90 kg K20 ha-l) with four replications. The plot size was laid out 12m2.
The Ram Dhan variety was selected for the study area of Chitwan valley. The highest rice
grain production (524lkg ha-l), plant height growth (104.5 em), number of tillers (267) and
straw weight (7067 kg ha-l) were recorded in treatment six (T6: 100:30:75: N: P205: K20
kg ha-l) in the first year (2064). Statistically, both grain and straw yield were found
significantly higher as compare to treatment two (T2: 100:30:15: N: P205: K20 kg ha-l).
In second year, the highest rice grain (3875kg ha-l) and straw (4376 kg ha-l) yield was
obtained from treatment five (T5: 100:30:60:N: P205: K20 kg ha-l). In three years
research period, the highest rice grain (4304 kg ha-l) was produced by the treatment five
(T5). Similarly, the highest straw yield (5106kg ha-l) was obtained by treatment six (T6).
Three years field experiment reveals 60 kg .K20 ha-l recommendation could be sustainable
rice production under rice wheat cropping system of light textured soil. The experimental
results also indicated a depleting trend of inherent soil potassium due to several factors such
as intensive cultivation, leaching losses ·and imbalance use of potassium containing
fertilizers in the cropping systems.