Response of Potato (Solanum tuberosum L.) to NPSB Fertilizer Rate and Inter Row Spacing at Buno Bedele Zone
DOI:
https://doi.org/10.47667/ijpasr.v6i2.364Palabras clave:
Potato, NPSB, Inter row spacingResumen
Potato is a key tuber crop in Ethiopia, contributing significantly to food security and rural livelihoods. However, its productivity remains low due to factors such as improper fertilizer application and unsuitable inter-row spacing. This study was conducted during the 2022–2023 cropping season to evaluate the effects of NPSB fertilizer rates and inter-row spacing on potato yield and yield components. Four NPSB levels (50, 100, 150, and 200 kg ha⁻¹) and three inter-row spacings (65, 75, and 85 cm) were tested, along with a control, using a 4 × 3 factorial arrangement in a randomized complete block design with three replications. Analysis of variance revealed significant effects of both NPSB rate and spacing on all measured parameters, though their interaction was not significant. The highest marketable tuber yield (51.36 t ha⁻¹) was obtained with 200 kg ha⁻¹ NPSB, while the widest spacing (85 cm) produced 45.16 t ha⁻¹. Agronomic efficiency was greatest (152.4 kg kg⁻¹) at the lowest NPSB rate (50 kg ha⁻¹). Marketable tuber yield showed strong positive correlations with total tuber yield (r = 0.99***), average tuber weight (r = 0.92***), and large tuber size (r = 0.92***). Partial budget analysis indicated the highest net benefits of 1,231,355 birr ha⁻¹ (3823.92% MRR) for NPSB and 2,120,240 birr ha⁻¹ (11,444.83% MRR) for 85 cm spacing. Therefore, applying 150 kg ha⁻¹ NPSB fertilizer with 85 cm inter-row spacing is the most productive and economically viable practice for potato cultivation in the study area.
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