The effect of microfertilizer «Agro-Master» on the yield and quality of early and medium early of potato tubers varieties was studied, carried out at the experimental field of North Caucasus Research Institute of Mountain and Foothill Agriculture - branch of the VSC of RAS in the forest-steppe zone of Republic of North Ossetia-Alania on grass rotation in the period from 2017 to 2019 yy. The experimental data indicate that the use of microfertilizer «Agro-Master» in a specific soil and climate zone is a promising technique that can improve the productivity and quality of potato tubers in the field. The data of our studies on leached chernozems showed no clear differences in the timing of the onset of the development phases of potatoes. The intensity and speed of emergence of seedlings to a greater extent depends on weather conditions and varietal characteristics. It was found that when spraying potatoes with microfertilizer «Agro-Master» in different doses, the process of dying of tops is slowed down in comparison with the control options. So, in the Zukofsky early variety, the top-off phase begins 7-8 days earlier than the Red Scarlett variety and 10-11 days of the Predgorny variety of local selection. The maximum yield increase was observed when processing of the microfertilizer «Agro-Master» at a dose of 2 kg/he on the pre-mountain local breeding grade – 27,5 tons per hectare, while the increase in yield to control was 5,0 tons per hectare, for varieties of Zukofsky early and Red Scarlett – 5,0 and 4,7 tons per hectare respectively. The highest dry matter content was on the experimental version (dose 2 kg / ha) for the Predgorny variety – 26,6 %, the Zukofsky early and Red Scarlett varieties – 25,9 and 23,8 %, that accordingly is more than control on 3; 2 and 3 %. The starch content in the studied potato tubers in the experimental varieties was diverse. The maximum starch content in potato tubers was obtained using the variant treated with Agro-Master at a dose of 2 kg/he for Predgorny variety (16,0 %), which is explained by the favorable influence of microfertilizer «Agro-Master» and the manifestation of varietal characteristics.

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Abstract. The purpose of the work is to study the influence of the growth regulator “Regoplant” and microfertilizer “Ultramag Kombi” on the photosynthetic productivity of the potatoes of the Barna variety based on the results of field experiments in the forest-steppe zone Republic of North Ossetia-Alania. Methods. Studies on the tasks were carried out in 2018–2020. at the experimental site of the NCRIMFA branch of the VSC of RAS in the conditions of the forest-steppe zone Republic of North Ossetia-Alania according to generally accepted methods. The soil of the experimental plot is medium-power heavy loamy leached chernozem, lined with pebbles. Results. It is established, that biological products under identical soil and weather conditions assisted different progress of plants and approach of phases of vegetation. For all variants of the experiment, the number of stems increased by 0,3–0,7 pcs., the height of the stems of potato plants – by 3,8–4,9 cm in comparison with the control. An intense increase in the mass of tops occurred when using a tank mixture (growth regulator “Regoplant” (25 ml/ha) + microfertilizer “Ultramag Combi” (0,75 l/ha)) – by 74 g/bush, or 15.5 % compared with the control variant. During the growing season, the sum of the photosynthetic potential (FP) was 1,070 thousand m2 •days/ha in the control, and on average 1198–1406 thousand m2•days/ha in the experimental variants. The greatest accumulation of dry matter was noted when using a tank mixture – 917 g/m2. The maximum pure photosynthetic productivity was observed in experimental variant IV – 6,52 g/m2•day compared to the control option. Scientific novelty. For the first time in the forest-steppe zone Republic of North Ossetia-Alania the effect of the growth regulator “Regoplant” and microfertilizer “Ultramag Kombi” on photosynthetic activity of potatoes was studied. Practical significance. The studies carried out make it possible to recommend in potato production the use of a tank mixture of an effective growth regulator “Regoplant” at a dose of 25 ml/ha and microfertilizer “Ultramag Combi” at a dose of 0,75 l/ha, as an ecologically safe and low-cost agricultural method when processing vegetative plants, providing an increase in yield and quality of tubers.

Abstract. The authors present the results of the application of complex organo-mineral fertilizer “Bioklad” on mixed sowing of oats with peas in the conditions of the forest-steppe zone Republic of North Ossetia-Alania. The purpose of the work is to study the effectiveness of the use of the organomineral fertilizer “Bioklad” on the yield and nutrition of mixed sowing of oats with peas in the conditions of the forest-steppe zone Republic of North Ossetia-Alania. Methods. Studies on the tasks were carried out in 2016–2018 at the experimental site of the North Caucasus Research Institute of Mountain and Foothill Agriculture – branch of the Federal Center “Vladikavkaz Scientific Center of the Russian Academy of Sciences” in the conditions of the forest-steppe zone Republic of North Ossetia-Alania according to generally accepted methods. The soil of the experimental plot is medium-power heavy loamy leached chernozem, lined with pebbles. Results. The use of fertilizer “Bioklad” had a significant impact on the timing, fullness of shoots and the density of standing plants up to harvest. The field germination rate for peas varied between 70,5 and 72,4 %, while the oat rate was 76,4 to 80 %. The option with seed inoculation was highlighted. According to the dynamics of the height of the plants also stood out the option with the inoculation of seeds. The use of complex fertilizer “Bioklad” had a positive effect on the yield and quality of the green mass of oats with peas. The largest amount of phytomass was obtained under the variant with inoculation of seeds – 283,3 c/ha, which is higher than the control version at 68,3 c/ha. In terms of the content of digestible protein, the harvest of the mixture of oats with peas exceeded the zootechnical norm, the yield from one hectare reached 6,0–6,9 c/ha, against 5,2 c/ha in control, which per feed unit was 113,7–119,9 g. The collection of feed units amounted to 50,02–60,68 kg/ha, and in the control 44,23 kg/ha, feed protein units, respectively: 55,01–64,84 kg/ha; 48,12 kg/ha. Scientific novelty. For the first time in the conditions of the forest-steppe zone Republic of North Ossetia-Alania studied the effect of complex organomineral fertilizer “Bioklad” on plant growth processes, formation of green mass, quality of products in a two-component mixture (oats + peas).

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