Preserving potato tubers is vital for marketability and seed use. In subtropical regions, small growers store potatoes at ambient temperatures, requiring storability techniques. Applying exogenous nutrition improves tuber keeping quality. This study examined the impact of nutritional treatments on the quality and postharvest longevity of seed potatoes. Conducted in the autumn seasons of 2019–2020 and 2020–2021 at two locations in Punjab, the experiment employed a split-plot design with three organic treatments: farmyard manure (FYM) at 50 t ha−1, biofertilizer (Biof) at 10 kg ha−1, and a control. Five phosphorus levels were tested in subplots. Results indicated that FYM significantly reduced total weight loss, with values ranging from 29.4% to 41.4% at 120 days of storage, compared to higher losses in Biof and Control treatments. Sprouting losses decreased by 3.34% to 6.19% with FYM over Biof and control, achieving the lowest sprouting rates of 85.7% to 93.0%. FYM also resulted in the lowest shriveling index (3.8 to 4.2) and improved tuber dry matter and starch content, maintaining higher levels throughout storage. Total phenols were significantly elevated in FYM-treated tubers, with values of 84.7 to 90.7 mg 100 g−1, reflecting a good percentage quality improvement compared to the control. FYM and biofertilizer markedly increased total tuber yields, with FYM achieving a remarkable 30% boost compared to the control. Additionally, phosphorus levels at 125 kg ha−1 resulted in a notable 24% increase. Optimal phosphorus fertilization, particularly P200, further reduced weight loss and improved shriveling, dry matter, and starch content by similar margins. These findings suggest that FYM and optimal phosphorus fertilization can significantly enhance seed potato quality, reduce postharvest losses, and boost marketability.
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