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PHOTOSYNTHETIC PRODUCTIVITY AND YIELD OF WINTER WHEAT DEPENDING ON THE APPLICATION OF MICRONUTRIENT FERTILIZERS AND PLANT GROWTH RETARDANTS
A.S. Shcherbakov, Postgraduate;
S.V. Bogomazov, Candidate of Agricultural Sciences, Associate Professor;
A.V. Lyandenburskaya, Candidate of Agricultural Sciences;
E.V. Efremova, Candidate of Agricultural Sciences, Associate Professor;
O.N. Kukharev, Doctor of Technical Sciences, Professor
Federal State Educational Institution of Higher Education "Penza State Agrarian University", Penza, Russia, tel. +79004682721, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

The purpose of the study was to investigate the effect of complex micronutrient fertilizers and growth regulators with a retarding effect on the photosynthetic productivity and yield of winter wheat. In order to increase yields and photosynthetic parameters, it is important to determine the justification for the use of complex micronutrient fertilizers and plant growth regulators in cultivation technology. On average, the highest leaf area (56.63 thousand m2/ha) and the highest photosynthetic potential (1593.10 thousand m2/ha × day) were formed in plants treated with the fertilizer Aquamix ST. The application of the growth regulator KHEFK led to a reliable increase in leaf area by 1.79 thousand m2/ha and in photosynthetic potential by 43.59 thousand m2/ha × day. When evaluating the influence of the factors and their gradations on the quality of the work of the photosynthetic apparatus, it should be noted that the net photosynthetic productivity (NPP) in the variants with foliar application of Aquamix ST was 5.97 g/m2 × day. Retarding growth regulators significantly changed the value of NPP, resulting in an increase of 0.05 g/m2 × day. According to the results of the experiment, it was found that the highest yield of winter wheat (4.95 t/ha) was obtained when the plants were treated foliarly with the fertilizer Aquamix ST and the growth regulator KHEFK.
Keywords: winter wheat, micronutrient fertilizer, growth regulator, photosynthetic productivity, yield.

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