Determining the effect of different variants of mineral fertilizer on some physiological indicators in maize
Gergana Ivanova-Kovacheva

, Iliana Ivanova, Nikolay Kovachev, Galin Ginchev

, Lyubomir Ivanov

Резюме: The study, aimed at establishing the effect of different mineral fertilization options on the content of photosynthetic pigments and resistance to environmental stress in maize, hybrid Pc 464, covers the 16th rotation (from 2018 to 2022) of the Longstanding Stationary Fertilizer Experiment (LSFE), located in the Experimental Field of IASS "Obraztsov chiflik", Rousse. The impact of applied mineral fertilizers on the resistance of maize to environmental stress and the dynamics in the content of photosynthetic pigments during the growing season was monitored. Lower resistance to high temperatures was found in the variants with nitrogen fertilization – the measured electrical conductivity of leaf membranes of the variants with combined nitrogen-potassium (N15K7) and nitrogen- phosphorus (N15P12) fertilization was 65.46 µS cm-1 and 61.08 µS cm-1 respectively with 58.52 µS cm-1 for the unfertilized variant used as control. Resistant to atmospheric drought were found to be the variants with combined phosphorus-potassium (P12K7) – 52.62 µS cm-1 and with potassium fertilization (K7) – 54.18 µS cm-1. The highest content of chlorophylls (Ca+b 0.176 mg g-1) was found in the leaves of the maize plants from the variant with c nitrogen fertilization (N15). The lowest chlorophyll content (Ca+b 0.094 mg g-1) was found in the variant with potassium (K7) fertilization. The different variants of fertilization in maize did not cause significant changes in the percentage content of carotenoids.
Ключови думи: carotenoids; chlorophyll; drought; environmental stress; maize; mineral fertilizers; photosynthetic pigments
Цитиране: Ivanova-Kovacheva, G., Ivanova, I., Kovachev, N., Ginchev, G., & Ivanov. L. (2025). Determining the effect of different variants of mineral fertilizer on some physiological indicators in maize. Bulgarian Journal of Crop Science, 62(3) 30-41 (Bg).
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| Дата на публикуване: 2025-06-26
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