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Sustainability of medicago varia marl sorting populations. To sheet patterns in ecotopes of the south of the middle russian highland

2019; Volume: 326; Issue: 1 Linguagem: Inglês

10.32634/0869-8155-2019-326-1-109-112

2686-701X

V. I. Chernyavskikh, Zh.A. Borodaeva, Elena Dumacheva,

Agricultural Development and Policies

Varieties and forms of alfalfa, selected for high-yield field crop rotations, may be completely unacceptable for cultivation in other, less favorable conditions due to the high degree of damage to the complex of diseases under the general name leaf spot. Therefore, in the system of adaptive breeding it is necessary to conduct a comprehensive assessment of varieties and new varieties in different ecotopes. The purpose of the study was to study the development and prevalence of leaf spots in the cultivation of M. varia Mart. for seed purposes in various ecotopes of the region. Presented for discussion studies conducted in 2016-2018. On experimental plots of Chernjansky branch of CJSC «Krasnoyaruzhskaya Grain Company» of the Belgorod Region. In the experiment, 8 varieties and varieties of M. varia Mart. (factor A) in various ecotopes of the Belgorod region on different soil differences (factor B). In comparative trials in various ecotopes, four plant populations had the highest productivity on fertile soils (A2, A4, A7, A8). Population A5 and A6 showed good ecological adaptation on meadow soils. These forms had a general morphological difference from the other forms - a pronounced wax coating on the leaves. Forms with a pronounced manifestation of mf-mutation at the highest productivity on the soils of field crop rotations, sharply reduce seed yield in conditions of meadow ecotopes. The degree of damage to plants by spots increases with cultivation in meadow ecotopes due to the special conditions of the microclimate, contributing to the development of fungal diseases. The least affected spots are the populations created on the basis of the selection of forms with high expression of mf mutations with simultaneously a high level of wax coating. Evaluation of the source material in the contrasting conditions of various ecotopes makes it possible to more accurately identify the breeding value of sample samples and their resistance to diseases.