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Journal of Agronomy

Year: 2007 | Volume: 6 | Issue: 1 | Page No.: 88-93
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Authors

Tuhin Suvra Roy

Takashi Nishizawa

Mohammed Hazrat Ali

Keywords

Research Article

Flower, Berry and True Potato Seed Production in Potato Mother Plants (Solanum tuberosum L.). 2. Effects of Nitrogen and Potassium Fertilizers

Tuhin Suvra Roy, Takashi Nishizawa and Mohammed Hazrat Ali
The combined effects of different levels of nitrogen and potassium fertilizers on flowering and yield components of True Potato Seed (TPS) were investigated using crosses of ♀MF-II and ♂TPS-67. Twelve combinations of 3 N (0, 225 and 300 kg ha-1, respectively) and 4 K (0, 125, 175 and 225 kg ha-1, respectively) levels were applied to MF-II. Different levels of N or K showed significant effects on flowering and TPS yield. The combinations of N and K were also significant for most of the parameters except for the number of flowers inflorescence-1, number of berries plant-1 and number of TPS per small and medium size berry. Out of 12 treatment combinations, 225 kg N and 225 kg K ha-1produced the highest number of berries (22.7) and yield of berries plant-1 (207.2 g), whereas 225 kg N and 125 kg K ha-1 produced the maximum number of TPS berry-1 (196). The weight of 100-TPS increased with increasing N rate but decreased with increasing K rate; the results revealed that an inverse relation was observed between N and K on 100-TPS weight. The highest 100-TPS weight (83.8 mg) and maximum quantity (113.0 kg ha-1) of quality (> 1.18 mm) TPS were obtained with the application of 300 kg N and 125 kg K ha-1, while 225 kg N and 125 kgK ha-1 produced the highest TPS yield (145.3 kg ha-1). Our study showed that 300 kg N and 125 kgK ha-1 was the best combination for commercial production of quality TPS obtained from MF-II x TPS-67.
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