The analysis of the wind factor as a factor of wind erosion of Polissia soils is highlighted. The highest intensity of wind erosion in the Polissya zone is observed in the spring and autumn periods, when the density of vegetation cover is the lowest during the year and there is no snow cover. The temporal dynamics of the wind regime forms certain patterns, which determines the formation of the corresponding clusters of months of the year as indicators of the temporal regularity of the wind regime and clusters of administrative districts as indicators of the spatial regularity of the wind regime. The early spring period is the least long (two months), which allows it to be interpreted as transitional. This interpretation explains the inclusion in this cluster by the dynamic features of August as also the transition period from the summer wind regime to the autumn one. The winter period is characterized by an extremely strong wind regime, the lowest wind intensity is observed in the summer-autumn period. The transitional early spring period is characterized by an intermediate level of wind load, but the greatest variability of indicators, which also emphasizes the transitional nature of this time stage of the year. It was established that the maximum value of the wind factor for these areas is observed in winter and is  3,57  m3  s−3,  and  the minimum  is observed in  August and is 2,3 3,57 m3 s−3. The central and eastern regions (Manevytskyi, Kovelskyi and Rozhishchenskyi) also form a homogeneous subzone, the peculiarity of which is that the duration of strong winds in the winter period is somewhat shorter compared to the northwestern regions. The highest wind load is observed in the winter months, and the lowest at the end of summer. Geographically, the north-western and south-eastern regions of the region experience the greatest wind load. In terms of time, three consecutive periods can be distinguished: winter, early spring, and summer-autumn.

Ukraine, as a Party of the UN FCCC, cooperates with international organizations in the field of environmental protection, including ensuring the fulfillment of obligations in the field  of  climate change, namely to reach the level of greenhouse  gas emissions  in  2030 in  the  amount of  exceeded 60% of the level of 1990. The agricultural sector has a significant contribution to the total emissions of greenhouse gases in Ukraine, which during 1990-2020 fluctuated between 9-14%. In agriculture, the emissions of three  greenhouse  gases  (methane,  nitrous  oxide  and  carbon  dioxide)  are considered, the emissions of which lead to activity in two branches – livestock and plant growing. Livestock is characterized by such processes as enteric fermentation and manure management, which are accompanied by the emission of mainly methane. The key factors that determine the dynamics of greenhouse gas emissions in livestock are the number of agricultural animals and the type of manure management system, which is used to collect, transport, store and use manure. The largest contribution in terms of greenhouse gas emissions is made by the category of enteric fermentation (mainly enteric fermentation of cattle), the share of which during the 1990- 2020 fluctuated mainly in the range of 80-85%, and as of 2020 it decreased to 79.3%. The amount of emissions in plant growing is determined by factors specific to each process, namely: the amount of fertilizers (nitrogen and organic) applied to agricultural soils, the amount of applied liming materials, the amount of N in crop residues, the area of organic soils for crop planting etc. The main greenhouse gas in this area is  nitrous  oxide,  the  dynamics  of  whose  emission  is generally characterized by two directions – a significant and rapid reduction by  more  than  60%  by 2003 and subsequent gradual growth. The  development of  different  areas  of  plant  growing  takes place in different directions and with different intensity, and therefore have different contributions to the total volume of N2O emissions. The largest share of emissions, both in 1990 and in 2020, comes from N application with mineral fertilizers and N application with crop residues.

The article presents results of the research and mathematical modelling of the rainfall erosivity factors. Erosion, whether water, wind or resulting from soil cultivation, includes three processes -soil descaling, movement and sedimentation. Spatial characteristics of precipitation during two researched periods are similar, having certain quantitative peculiar features. A common feature is maximum precipitation in the southwest and to a lesser extent in the eastern part of the region. Minimum precipitation is typical for the western part of the region. Peculiar feature of the second period of research is increase of contrasting effect of precipitation regime, when minimum values of precipitation decrease and maximum ones increase. Enhancement of contrasting effect of precipitation in space or time may cause increased intensity of erosion processes to the extent where the intensity of precipitation increases due to such contrasting effect. Thus, doubtless interest lies in the research of greater spatial or time contrasting effect of precipitation regime to activate water erosion. Thus, spatial peculiarities of distribution of precipitation within territory under study and time patterns correlate, but have their own special features. Clearly, total amount of precipitation as well as time distribution as a marker of correlation of intensification factor of erosion processes and defence mechanisms of vegetative cover are dominant for total losses of soil due to erosion. Coincidence of time of intense precipitation in summer and availability of vegetative cover reduces erosion. Nevertheless, continuance of intense precipitation when harvesting is started may cause intensification of water erosion of soil. Use of spatial variables and regression equations for spatial data calibration helped to estimate the spatial variation of precipitation on the territory under study. Comparison of two periods of research showed that in 2010-2016 significant reduction of rainfall erosivity factor has taken place in comparison with the previous period 9.6-65.4 MJ mm ha -1 h -1 per year. In Turiyskyi and Kovelskyi district changes in rainfall erosivity factor were minimal (9.6 and 16.7 MJ mm ha -1 h -1 per year respectively). Conversely, in Ivanytskyi and Gorokhivskyi districts changes were the most significant -58.1 and 65.4 MJ mm ha -1 h -1 per year respectively.

The results of researches of ecological value of plant growth regulators on growth of Scots pine seedlings in the conditions of the closed ground — greenhouses of Sobolivsky forestry of Subsidiary enterprise «Romanovsky forestry of agro-industrial complex» of Zhytomyr regional municipal agroforestry enterprise «Zhytomyroblagrolis» of Zhytomyr regional council are given. Potassium humate, Epin (manufactured by Agriflex), Alga-600 were used in the experiments. Agrochemical analysis of soil in the greenhouses of the experimental farm was carried out. The study of the impact of growth regulators on the ecological condition of plants, their seedlings took place during the growing season of 2021. The influence of plant growth regulators on Scots pine seeds in the preparation of seed material for sowing was studied, the greatest efficiency of pre-sowing soaking of Scots pine seeds in aqueous solutions of growth regulators in the experiment with potassium humates and Epine was defined. It was found that the treatment of seedlings in greenhouses the greatest stimulating effect is achieved when using solutions of Epine and potassium humates at a concentration of 5 mg/l solution, the ecological impact on biometric indicators was assessed: height, root neck diameter of seedlings. It was found that in the needles of Scots pine treated with humate potassium content of a, β-chlorophyll is 70.4 mg / 100 g of raw weight, however, in the needles of Scots pine treated with growth regulator Alga — 600 this figure reaches 49.0 mg / 100 g of raw weight and approaching the indicators of the control area. According to the accumulation of a, β-chlorophyll, it can be predicted that seedlings treated with potassium humates and epinephrine will be more productive than others and will not cause environmental damage. It is recommended for agro-forestry enterprises, in particular, Zhytomyr Polissya, namely for the Subsidiary enterprise «Romanivsky forestry of agro-industrial complex» of Zhytomyr regional municipal agro-forestry enterprise «Zhytomyroblagrolis» of Zhytomyr regional council in closed soil conditions to obtain high-quality compliance with modern requirements for the balanced development of agricultural production as a component of environmental security of Ukraine.