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True Potato Seed Production and its Economic Analysis as Influenced by Supplemental Nitrogen and Planting Density |
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Tuhin Suvra Roy,
Takashi Nishizawa and Mohammed Hazrat Ali |
Abstract:
A 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.
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How to cite this article:
Tuhin Suvra Roy, Takashi Nishizawa and Mohammed Hazrat Ali, 2008. True Potato Seed Production and its Economic Analysis as Influenced by Supplemental Nitrogen and Planting Density. Asian Journal of Plant Sciences, 7: 73-78.
DOI: 10.3923/ajps.2008.73.78
URL: https://scialert.net/abstract/?doi=ajps.2008.73.78
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