In the field fodder production of the Middle Urals, red clover remains the main fodder crop, which is used both in single-species and polyspecies crops.The tetraploid type red clover is of par-ticular value, as it is more productive, winter-hardy, disease-resistant, providing a feed yield with a high crude protein content.Determination of leaf area, photosynthetic activity, dynamics of accumula-tion of dry matter of red tetraploid clover in agrophytocenoses has been little studied, but of practical interest.
In 2013-2017 In the Udmurt Research Institute of Agriculture, on sod-podzolic soils, formation specifics of dry mass of agrophytocenoses of perennial grasses based on Kudesnik red clover were studied.To create polyspecies agrocenoses, we used timothy grass, alfalfa, Lotus corniculatus, Audio/video Wallplates and Eastern galega.The leaf area varied depending on the composition of the agrophytocenosis from 34.
4 thousand m2/ha in the branch stage to 107.2 thousand m2/ha in the flower bud stage.The NEFF B47FS34H0B Built In Slide main contribution to the formation of the assimilation surface of grass mixtures was made by red clover (66.
7-92.4%).The photosynthetic potential was the highest (948-1034 thousand m2 x day/ha) in grass mixtures clover + timothy grass, clover + alfalfa and in single-species sowing of clover.
Determina-tion of the dynamics of the accumulation of dry matter showed that in the branch-bud period there was the greatest increase in dry matter.The yield of dry matter in this stage was 525-647 g/m2, while in mixed crops this indicator was significantly higher than in single-species clover crops.By the flower-ing stage, the dry matter decreased to 474-618 g/m2.
The yield of dry matter of agrophytocenoses was 67-76% formed due to the first mow.The most productive (4.7 t/ha) in the first mow was a mix-ture of clover with timothy grass.