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Pakistan Journal of Biological Sciences
  Year: 2000 | Volume: 3 | Issue: 6 | Page No.: 943-948
DOI: 10.3923/pjbs.2000.943.948
 
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Nitrogen Distribution and Uptake Efficiency Traits of Potato under Different Nitrogen Regimes

Subhash Chandra Ghosh, Koh-ichiro Asanuma , Akihito Kusutani and Masanori Toyota

Abstract:
Nitrogen distribution in different plant organs, dry matter production and tuber yield have been studied in spring cropping potato (Solanum tuberosum L.) for three N levels (N0= control, N1= 101 kg ha–1 and N2= 202 kg ha–1) and two cultivars (May Queen and Dejima). Higher levels of N (N2) produced higher amount of dry matter but yield was higher in N1 treatment in both cultivars. Higher levels of N substantially increased the plant N concentration and the amount of N uptake to different plant organs was also increased. The average uptake rate up to 50 DAE was 1.81, 3.21 and 4.98 kg ha–1 day–1 in May Queen and 1.99, 3.64 and 5.17 kg ha–1 day–1 in Dejima for N0, N1 and N2 treatments respectively. N uptake in different plant organs showed significant positive correlation among each other and total uptake and total dry matter production but not with total yield. Total uptake and total dry matter production also showed highly significant correlation in two cultivars. The C/N ratio decreased as fertilizer N increased throughout the season but it was increased with time. C/N ratio showed significant positive correlation with total N uptake and total dry matter but not with yield. Nitrogen uptake efficiency (NUE) by the whole plant (NUEp) and tuber (NUEtu) was relatively higher in N1 treatment than N2. In N1 treatment, the peak values of NUEp and NUEtu were 62 and 33% in May Queen and 68 and 31% in Dejima but in N2 treatment the values of NUEp were 65% in both cultivars and that of NUEtu were 17 and 16% in May Queen and Dejima respectively.
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How to cite this article:

Subhash Chandra Ghosh, Koh-ichiro Asanuma , Akihito Kusutani and Masanori Toyota , 2000. Nitrogen Distribution and Uptake Efficiency Traits of Potato under Different Nitrogen Regimes. Pakistan Journal of Biological Sciences, 3: 943-948.

DOI: 10.3923/pjbs.2000.943.948

URL: https://scialert.net/abstract/?doi=pjbs.2000.943.948

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