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<p>The aim of the study was to evaluate the relationships between the SPAD index value and plant height (treated as independent variables) and the yield of the marketable fraction (&gt; 35 mm) and the seed tuber fraction (36–60 mm) (dependent variables) in eight table potato cultivars differing in flesh colour. A field experiment was conducted in 2021–2023 on Haplic Luvisol soil at the Agricultural Experimental Station in Zawady. Significant cultivar-dependent and interannual differences were observed in both plant height and SPAD index values. SPAD I, SPAD II, and SPAD III are measurements that reflect leaf chlorophyll content at three different time points. The lowest values of both parameters were recorded in 2023, a year characterised by extreme precipitation deficits. The highest SPAD values were noted in 2022, whereas the greatest plant height was recorded in the 2021 growing season. SPAD I and SPAD II indices showed a significant positive correlation with seed tuber yield, while the highest yields of the marketable fraction were obtained for the cultivars Eurostar, Bora Valley and Provita. The results indicate that both the SPAD index and plant height may serve as useful prognostic indicators of the yield-forming potential of table potato cultivars, particularly under conditions of moderate environmental stress.</p>

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The Significance of the SPAD Index and Plant Height in Shaping the Yield of the Marketable Fraction and Seed Tubers in Potato Cultivars with Different Flesh Colour

  • 期刊论文

  • 发表日期：

    2026年5月19日

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  • Emilia Rzążewska,
  • Krystyna Zarzecka,
  • Marek Gugała

摘要

The aim of the study was to evaluate the relationships between the SPAD index value and plant height (treated as independent variables) and the yield of the marketable fraction (> 35 mm) and the seed tuber fraction (36–60 mm) (dependent variables) in eight table potato cultivars differing in flesh colour. A field experiment was conducted in 2021–2023 on Haplic Luvisol soil at the Agricultural Experimental Station in Zawady. Significant cultivar-dependent and interannual differences were observed in both plant height and SPAD index values. SPAD I, SPAD II, and SPAD III are measurements that reflect leaf chlorophyll content at three different time points. The lowest values of both parameters were recorded in 2023, a year characterised by extreme precipitation deficits. The highest SPAD values were noted in 2022, whereas the greatest plant height was recorded in the 2021 growing season. SPAD I and SPAD II indices showed a significant positive correlation with seed tuber yield, while the highest yields of the marketable fraction were obtained for the cultivars Eurostar, Bora Valley and Provita. The results indicate that both the SPAD index and plant height may serve as useful prognostic indicators of the yield-forming potential of table potato cultivars, particularly under conditions of moderate environmental stress.