Effects of organic fertilizer applications on marketable yield and tuber size distribution in potato
DOI:
https://doi.org/10.61326/jofbs.v6i1.02Keywords:
Potato, Solanum tuberosum, Organic fertilization, Vermicompost, Poultry, Sheep, Cattle, Tuber size, Marketable yieldAbstract
This study aimed to determine the effects of individual and combined applications of different organic fertilizers on marketable tuber yield and tuber size distribution of potato grown under high-altitude ecological conditions over two growing seasons (2020-2021). In the experiment, cattle (C), sheep (S), vermicompost (V), and poultry (P) manures were applied either individually or in specific combinations. The results indicated that fertilizer treatments significantly affected total yield, marketable yield, and tuber size distribution in both years. Generally, combined applications outperformed individual applications. Specifically, the highest marketable tuber yield (22.0 t ha⁻¹) and marketable tuber proportion (87.9%) were obtained from the T16 treatment. While the highest large tuber yields were recorded in T13 (14.3 t ha⁻¹) and T16 (13.5 t ha⁻¹) treatments, the maximum medium and small tuber yields were found in T11 (9.6 t ha⁻¹) and T4 (3.7 t ha⁻¹) treatments, respectively. Increasing the number of organic fertilizers applied in combination enhanced the proportion of marketable and large tubers while reducing the proportion of small and cull tubers. The application of cattle, sheep, vermicompost, and poultry manures at 25% each of their recommended doses (T16 - C×S×V×P) provided the highest marketable tuber yield and the most balanced size distribution among all treatments. In this treatment, the proportion of marketable tubers reached 87.9%, whereas the cull tuber ratio decreased to 3.6%. The combined use of diverse organic fertilizers enhanced nutrient availability and tuber bulking, providing a sustainable strategy to improve both productivity and market quality in high-altitude potato production. These findings suggest that in high-altitude ecological conditions, the complementary use of diverse organic fertilizers with different characteristics instead of a single fertilizer source is a sustainable and effective method for both yield and market quality.
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