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ABSTRACT: The effect of nitrogen and plant spacing on seed sized tuber yield and seed quality of potato (cv. Asterisk) was studied at the Bangabandhu Sheikh Mujubur Rahman Agricultural University, Salna, Gazipur. Four rates of nitrogen (100, 130, 160 and 190 kg ha-1) and four plant spacing (70 cm × 25 cm, 60 cm × 25 cm, 50 cm × 25 cm and 40 cm × 25 cm) constituted the treatment variables. In general, application of higher rate of nitrogen and higher plant spacing intensified canopy development, plant growth and increased total tuber development of seed potato. Application of 190 kg N ha-1 and 40 cm × 25 cm plant spacing contributed to the highest seed sized tuber yield (30.59 t ha-1) which was identical to that produced with 130 kg N ha-1 at 40 cm × 25 cm plant spacing. Contrary, the treatment of 160 kg Nha-1 and 40 cm × 25 cm plant spacing produced the maximum tuber yield per plot (20.88 kg) and the highest tuber yield per hectare (34.81 t ha-1). The N levels and spacing did not affect significantly the N and K content in tuber though the higher rates increased accumulation of the two elements. Similarly soluble sugar and starch content were also not affected significantly by the N levels and different plant spacing. Therefore, for getting maximum seed sized tuber yield 190 kg N ha-1 and for maximum tuber yield 160 kg N ha-1 at 40 cm × 25 cm spacing are suggested to apply.
Keywords: N and K content in tuber, plant spacing, Solanum tuberosum
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