Asian Journal of Plant Sciences1682-39741812-5697Asian Network for Scientific Information10.3923/ajps.2008.73.78Suvra RoyTuhin NishizawaTakashi Hazrat AliMohammed 1200871A field experiment was carried out to evaluate True
Potato Seed (TPS) production and its relative economic return as influenced
by supplemental nitrogen (N) at a range of 0-250 kg ha-1 and
planting density at a range of 8-16 haulms m-2 in potato mother
plants (Solanum tuberosum L.) using a cross of MF-II (♀)
and TPS-67 (♂). The single effect of supplemental N application
and planting density on the yield of berries and TPS was significant.
Number of berries plant-1, mean berry weight, number of TPS
berry-1 and yield of TPS showed maximum values when 0-150 kg
N ha-1 was applied, but the values decreased thereafter as
supplemental N application increased, irrespective of the size of the
harvested berries. Although only the weight of 100-TPS showed a maximum
value at 250 kg N ha-1 application, the value was similar to
that at 200 kg N ha-1 application. Mean berry weight, number
of seeds berry-1 and weight of 100-TPS showed the maximum values
at the lowest (8 haulms m-2) planting density and the values
decreased thereafter as the planting density increased, irrespective of
the size of harvested berries. A positive effect of higher planting density
was detected only in the number of berries plant-1 and yield
of TPS. The combination effect of supplemental N application and planting
density on the yield of berries and TPS was also significant. Although
the total yield of TPS was the highest at the combination of 150 N kg
ha-1 and 16 stems m-2, the yield of large size TPS,
which is regarded as high quality TPS, was the highest at the combination
of 200 N kg ha-1 and 12 stems m-2. This was also
true for the other characteristics of harvested TPS under different supplemental
N applications and planting densities; i.e., number of berries plant-1,
number of TPS berry-1 and weight of 100-TPS showed the maximum
values at the combinations of 0-150 N kg ha-1 and 8-16 stems
m-2 or 200 kg N ha-1 and 8 stems m-2,
but not at 200 N kg ha-1 and 12 stems m-2. The benefit
cost ratio,which was estimated from total cost of production
and gross return also showed that the combination of 200 kg N ha-1
and 12 stems m-2 were the optimal growth conditions to harvest
high quality TPS from the potato mother plants.]]>Almekinders, C.J.M.,1991Solanum tuberosum L.). Effects of stem density and pruning of lateral stems.]]>34379388Almekinders, C.J.M. and S.G. Wiersema,1991Solanum tuberosum L.). Effects of inflorescence position, nitrogen treatment and harvest date of berries.]]>34365377BADC,20062006Banik, P.K.,20052005Dayal, T.R., M.D. Upadhya and S.N. Chaturvedi,1984Solanum tuberosum L.).]]>27185188George, R.A.T. and R.J. Varis,19801980Golmirzaie, A.M. and R. Ortiz,200451759763Islam, S.M.F., M.M. Anwar and B. Manos,2000536261268Jackson, M.L.,19621st Edn.,Pages: 498Pages: 498Kanzikwera, C.R., D.S.O. Osiru, J.S. Tenywa, E. Adipala and A.S. Bhagsari,20008375385Kanzikwera, C.R., J.S. Tenywa, D.S.O. Osiru, E. Adipala and A.S. Bhagsari,20019127146Kinet, J., R.M. Sachs and G. Bernier,19851985Kraus, A.,1978Solanum tuberosum L.) as affected by nitrogen nutrition.]]>21183193Maingi, D.M., J.O. Nyabundi and H.M.K. Mariam,19941994pp: 194197MSTAT-C,1991Pallais, N.,198773784792Pallais, N., S. Villagarcia, N. Fong, J. Tapia and R. Garcia,198764483491Pallais, N. and N. Espinola,1992698593Roy, T.S., T. Nishizawa and M.H. Ali,2007Solanum tuberosum L.). Effects of nitrogen and phosphorus fertilizers.]]>6106112Roy, T.S., T. Nishizawa and M.H. Ali,2007Solanum tuberosum L.). Effects of nitrogen and potassium fertilizers.]]>68893Roy, T.S., T. Nishizawa and M.H. Ali,2007612691275Simmonds, N.W.,199740191224Upadhya, M.D., R. Cabello, R. Falcon and E. Chujoy,2003619371374Zrust, J.M.B.,19923810451052