Specific features of varieties and agrotechnological measures for the formation of photosynthetic indicators in soybeans
DOI:
https://doi.org/10.32636/01308521.2026-(79)-1-8Keywords:
soybean, variety, fungicide, inoculant, microfertiliser, leaf area, leaf area index, photosynthetic potentialAbstract
The results of research of the influence of agrotechnological measures on changes in the photosynthetic indicators of soybean crops are presented. It was established that among the studied varieties, the RGT Saidina variety formed higher values of leaf area, leaf area index, and photosynthetic potential, indicating its superior genetic potential compared to the RGT Salsa variety. Pre-sowing seed treatment with fungicides and inoculants had a positive effect on all studied photosynthetic parameters. For both varieties, the most effective experimental treatment involved the application of the fungicides «Maxim XL» (1.0 l/t) + «Apron XL» (0.5 l/t) + «BioMAG Soya» inoculant (3 kg/t) for pre-sowing seed treatment, combined with a double foliar application of the fungicide «Colosal Pro» (0.5 l/ha) and microfertilisers «Intermag Molybden» (1.0 l/ha) and «Quantum Bor Actyv» (1.0 l/ha) during the budding and flowering phases. The leaf area for RGT Salsa and RGT Saidina reached 23.1 and
24.6 thousand m²/ha during the budding phase, 32.5 and 35.3 thousand m²/ha during the flowering phase, and 28.7 and 32.7 thousand m²/ha during the pod-filling phase, respectively. Correspondingly, the leaf area index values were 2.29 and 2.44, 3.22 and 3.50, 2.84 and 3.24 m²/m². This demonstrates the high efficiency of an integrated system that combines chemical seed protection, inoculation, and double foliar nutrition and protection during critical growth stages of soybean plants. The foliar application of fungicides and microfertilisers during the budding and flowering phases ensured not only the maximum increase in leaf area but also a slower reduction during the pod-filling phase, indicating an extension of the period of active assimilation. For both varieties, the double application of treatments during the budding and flowering phases proved to be more effective than a single application.
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