Field experiments were carried out at Potato Research Farm, Hattiban, Khumaltar from
199J to 2003 under low nitrogen (N), medium organic matter and medium potassium (K)
silty-loam soil condition. The main objective of this trial was to determine the optimum dose
of these nutrients in potato-paddy cropping systems on Cv. Desiree for Kathmandu valley
conditions. In the trial, five different levels of N (0, 50, 100, 150 and 200 kg ha-1
) and four
different levels of K (0, 30, 60 and 90 kg ha-1
) were tested on potato crop. The f @ 100 kg
ha"1 and farmyard manure @ 20 tons ha"1 was applied uniformly in all the experimental
plots. Residual effects of these treatment levels were evaluated on succeeding paddy crops.
The increment in N level significantly increased tuber yield of potato whereas, some positive
effects were noticed with increased potassium levels too. In case of paddy, every increment of
N levels had increased number of tillers, plant height, as well as grain and straw yield.
Based on the results, application of N@ 150 kg and K 30 kg ha"1 is recommended for potato
crop. Residual effect of all the inorganic and organic fertilizers applied on preceding potato
crop showed that without additional applying of these nutrients also, grain and straw yield of
paddy could be obtained satisfactorily in Kathmandu valley condition.

Field experiments were carried out at Potato Research Farm, Hattiban, Khumaltar from
199J to 2003 under low nitrogen (N), medium organic matter and medium potassium (K)
silty-loam soil condition. The main objective of this trial was to determine the optimum dose
of these nutrients in potato-paddy cropping systems on Cv. Desiree for Kathmandu valley
conditions. In the trial, five different levels of N (0, 50, 100, 150 and 200 kg ha-1
) and four
different levels of K (0, 30, 60 and 90 kg ha-1
) were tested on potato crop. The f @ 100 kg
ha"1 and farmyard manure @ 20 tons ha"1 was applied uniformly in all the experimental
plots. Residual effects of these treatment levels were evaluated on succeeding paddy crops.
The increment in N level significantly increased tuber yield of potato whereas, some positive
effects were noticed with increased potassium levels too. In case of paddy, every increment of
N levels had increased number of tillers, plant height, as well as grain and straw yield.
Based on the results, application of N@ 150 kg and K 30 kg ha"1 is recommended for potato
crop. Residual effect of all the inorganic and organic fertilizers applied on preceding potato
crop showed that without additional applying of these nutrients also, grain and straw yield of
paddy could be obtained satisfactorily in Kathmandu valley condition.