Evaluation of growth regulators effect on rice plants under periodic irrigation

he article presents the results of research on the use of growth regulators on rice crops of Stalingrad 1 variety, irrigated by periodic watering. The description and methods of application of growth-regulating preparations containing various natural components affecting the growth and development of rice plants and their reaction to the treatment of seed material and leaf surface of plants with preparations are presented. The application of growth-stimulating preparation had an impact on the duration of the growing season. The longest growing season (116 day) was during the Extrasol treatment of seeds and vegetating plants in combination with N137P74K90, calculated to obtain the planned yield of rice by 7 t/ha, and, the water regime of the soil is not lower than 80% of minimum water capacity. The combined use of growth-stimulating preparation with the introduction of doses of macro-fertilizers for the planned yield of 6 t/ha, while maintaining a water regime of at least 70% of minimum water capacity, contributed to a reduction in the growing season by 1-3 days compared to the 7 t/ha variant (N137P74K90) and amounted to 105 days on the variant of treatment of vegetating rice plants with the growth preparation Zircon. Of the growth-stimulating preparations used, the best results were after Extrasol application when processing rice seed material and on the leaf surface while maintaining a pre-irrigation threshold of at least 80% in combination with a dose of fertilizer N137P74K90 for a planned yield of 7 t/ha.