Keywords: hybrid clover, foliar top dressing, growth biostimulants, leaf surface area, photosynthetic potential,
net photosynthetic productivity, seed yield 

// Мелиорация.– 2021. – №2(96) – P 62–69

An urgent problem in many countries is the development of new forms of fertilizers and growth regulators, which, in comparison with the use of simple fertilizers, provide a balanced ratio of nutrients for the crop, increase economic efficiency by reducing the cost of application. The article presents data on the effect of microfertilizers and growth biostimulants on the photosynthetic activity of seed crops of hybrid clover. The use of the studied preparations for foliar treatment of hybrid clover on average for 2018–2020 it increased  the leaf surface area and photosynthetic potential by 1.7–39.7 %, and the net photosynthetic productivity by 8.7–50 %.