Responsiveness of leguminous grasses: alfalfa (Medicago varia Mart.) and annual white sweet donnik (Melilotus albus Medic) on the influence of the domestic growth regulator "Mival-Agro"

The article presents data from laboratory and field experiments conducted on two biologically similar legume forage crops, Lucerne variable and annual white sweet clover. The research results showed that the studied crops responded positively to the use of the drug Mival-Agro. As a result of the study, it was found that these cultures do not respond equally to different concentrations of the drug. Especially at the initial stages of ontogenesis. The optimal concentration of the drug Mival-Agro was experimentally selected to increase the yield of forage and seeds of alfalfa and sweet clover in field conditions.

Introduction. Legumes have long been valued in agricultural production for their ability to produce plant products rich in crude protein and a positive effect on soil fertility. One of the most important forage crops in this regard was and remains – alfalfa. Feed made from its green mass is environmentally friendly and economical. The legume family also includes a less common type of herb – sweet clover. It is not only an excellent honey plant and phytomeliorate, but also a promising high-yielding forage crop. A promising way to increase the productivity of forage grasses is the use of new generation drugs, in particular Mival-Agro, which increase the mycotrophy of plants. Of particular interest is the study of the responsiveness of these crops to the use of the drug MivalAgro.

Object. The object of the study is two biologically similar legumes: variable alfalfa (Medicago varia Mart.) variety – Izumruda and annual white sweet clover (Melilotus albus Medic) – Srednevolzhsky and their reaction to the use of the domestic silicone growth regulator Mival-Agro.

Materials and methods. The research was carried out in the conditions of the southern forest-steppe of the Middle Volga region in 2018–2021, on the experimental field of the Volga Research Institute of Breeding and Seed Production named after P.N. Konstantinov – branch of the Federal State Budgetary Institution of Science of the Samara Federal Research Center of the Russian Academy of Sciences (Povolzhsky NIISS – branch of the Samara Scientific Center of the Russian Academy of Sciences). The establishment of nurseries and related observations were carried out according to the methods of testing forage crops.

Results and conclusions. The experience consisted of laboratory and field. Under laboratory conditions, the influence of the concentration recommended by the manufacturer MivalAgro, reduced and increased by 20%, was studied. The reduced concentration has a positive effect on root growth by lengthening by 2.5-4.7 mm, increasing germination by reducing hard seeds by 8.4%, in sweet clover and 5.0% in alfalfa. Under field conditions, the plants of the studied crops were treated according to the leaf with the established dosage – 64 mg per 1 ha of crops. The total forage yield of sweet clover in 2018 with the treatment of Mival-Agro significantly exceeded the control by 36.1%, in 2019 – 1.99 t/ha, in 2020 – was a minimum of 0.3 t/ha, and seed productivity was maximum with an increase in 120 kg/ha, in 2021 – 1.1 t/ha. The yield of the vegetative mass of alfalfa treated by Mival-Agro in the year of sowing was 8.8 t/ha, with an increase of 25.7%. Seed productivity was 41.2% higher than the control. In 2019, the forage mass of alfalfa exceeded the control by 24.3%, in the sum of two cuts, in 2020 by 14.0%, in 2021 – 11.1%. Seed productivity in 2019 was the highest during the study period, treatment with the drug increased the rate by 43.4%.

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