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Evaluation of the Effects of Different Levels of Nitrogen Fertilizer on Functional Traits and Traits Related to Nutritional Health in Potato Cultivars
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Aydin Tobeh *   , Salim Farzaneh , Ahmad Tobeh |
| university of mohaghegh ardabili |
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Abstract: (49 Views) |
This research was conducted to determine the effect of different levels of nitrogen fertilizer on three potato cultivars (Satina, Draga, and Agria) with varying maturation times. The experiment took place during the 2021-2022 agricultural year at a private farm in the village of Yonjalu, located 25 kilometers from Ardabil city, and the laboratory work was carried out at the Faculty of Agriculture of Mohaghegh Ardabili University. The experiment was designed as a factorial based on a randomized complete block design (RCBD) with four replications. The experimental factors included four levels of nitrogen fertilizer (no application, 80, 160, and 240 kg of pure nitrogen per hectare) and potato cultivars including Satina (early maturing), Draga (medium maturing), and Agria (late maturing). The results from the analysis of variance indicated that the main effects of nitrogen and cultivar on tuber yield, number of stolons, number of tubers, average weight of tubers per plant, and weight of underground organs (stolons and roots) were significant. Increasing nitrogen application up to 160 kg per hectare significantly enhanced the fresh tuber yield in the Agria cultivar compared to Satina and Draga, with the highest fresh tuber yield in Agria at 160 kg per hectare being approximately 51.75 tons per hectare. However, when nitrogen consumption increased to a maximum of 240 kg per hectare, the fresh tuber yield for Agria decreased significantly by 25% compared to the consumption of 160 kg per hectare, although root and stolon weights increased. The highest agricultural efficiency from nitrogen application was observed in Agria with 160 kg per hectare, while the lowest efficiency was related to Draga with 240 kg per hectare. As nitrogen levels increased from control to the highest level, nitrate content in both fresh and dry tubers also significantly increased. Early maturing cultivars (like Satina) showed a greater tendency for nitrate accumulation compared to late maturing cultivars (like Agria). Excessive nitrogen application not only reduced yield as a primary trait but also increased nitrate levels, which is a negative trait within this range. Therefore, excessive use of nitrogen fertilizer will decrease yield while increasing costs. The optimal nitrogen application rate was found to be 160 kg per hectare for the Agria cultivar, making it the best and most recommended treatment in this experiment.
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| Keywords: Number of stolons, Nitrate accumulation, Nitrate, Nitrogen use efficiency, Tuber yield of potato. |
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Full-Text [PDF 606 kb]
(23 Downloads)
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Type of Study: Research |
Subject:
Ecophysiology
Received: 2024/07/25 | Accepted: 2025/07/22 | Published: 2025/09/1
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