Agriculture and forestry

Tynko Valentyna Vasylivna – graduate student of the Department of Agriculture, Soil Science and Agrochemistry of Vinnytsia National Agrarian University (21008, Vinnytsia, 3 Sonyachna Street e-mail: 22valya.tinko@ukr.net).

Plant yield depends on the size and productivity of the photosynthetic apparatus, which in the process of plant growth and development should reach optimal performance. The article presents the indicators of the photosynthetic apparatus of plants depending on varietal characteristics, application of mineral fertilizers and foliar fertilization. The highest indicators of leaf surface area were observed in the variant of joint application of mineral fertilizer at the dose of N30P30K30 and foliar fertilization of plants with microfertilizer Vuxal in the phase of plant emergence in the tube and in the phase of earing in varieties Aizhan and Aristey , 3; 53.9 and 52.4, which is higher compared to the control of 5.4 and 5.5 and 6.8 and 6.6 thousand m² / ha. Also in this version of the experiment the highest photosynthetic potential of spring barley plants in the phase of plant emergence in the tube and in the phase of earing in the varieties Aijan and Aristei photosynthetic potential of crops in the phase of milk-wax ripeness was 2,436 and 2,428; 2,464 and 2,451, which is higher than the control of 0.634 and 0.705 and 0.662 and 0.728 million g / m2 per day. The net productivity of photosynthesis increased in some interphase periods, namely from the period of tillering to earing under the influence of experimental variants. With the application of mineral fertilizer at a dose of N30P30K30 net productivity of photosynthesis in the period of exit into the earing tube was in the variety Aizhan - 4.1 g / m2 per day, and in the variety Aristey - 3.8 g / m2 per day, which is higher than in the control options at 1.3 and 1.1 g / m2 per day.With the joint application of mineral fertilizer at a dose of N30P30K30 and foliar fertilization of plants with microfertilizer Vuxal in the phase of emergence of plants in the tube and in the phase of the beginning of earing in varieties Aijan and Aristey net productivity of photosynthesis in the period of emergence in the earing tube was 4.4 and 4.1; 4.5 and 4.2, which is higher than the control of 1.6 and 1.4 and 1.7 and 1.5 g / m2 per day.

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