scholarly journals NALYSIS OF THE ADAPTIVE POTENTIAL OF MODERN VARIETIES FLAX-DOLGUNETS IN THE CONDITIONS OF THE CENTRAL REGION OF RUSSIA

2021 ◽  
Author(s):  
Е.А. Трабурова ◽  
Т.А. Рожмина
Keyword(s):  
Central Region ◽  
Critical Period ◽  
Weather Conditions ◽  
Growing Season ◽  
Average Yield ◽  
Adaptive Potential ◽  
Hydrothermal Coefficient ◽  
Fiber Flax ◽  
Favorable Conditions ◽  
Modern Varieties

В статье представлены результаты оценки 16 сортов льна-долгунца отечественной и зарубежной селекции по урожайности волокна и основным параметрам адаптивности в условиях Центрального региона России. Погодные условия в годы проведения испытаний были различными, наиболее благоприятные условия сложились в 2018 году, гидротермический коэффициент за период вегетации составил 1,3, урожайность в среднем по опыту составила 2,02 т/га. Стрессовые условия, связанные с переувлажнением в критический период роста и развития растений льна-долгунца (ГТК в июне и июле 1,7 и 1,8 соответственно), имели место в 2017 году, урожайность в среднем по опыту – 1,03 т/га. Наиболее высокую урожайность льноволокна (1,78-1,97 т/га) в среднем за три года (2017 - 2019 гг.) показали сорта Цезарь, Синель, Добрыня (Россия), Marylin (Голландия), Белита (Республика Беларусь), Andrea и Altea (Франция). При стрессовых условиях (индекса условий среды -0,51) высокой адаптивностью обладали Цезарь (157,7%), Синель (152,9) и Добрыня (137,4). The article presents the results of evaluating 16 varieties of fiber flax of domestic and foreign selection in terms of fiber yield and the main parameters of adaptability in the conditions of the Central region of Russia. The weather conditions in the years of testing were different, the most favorable conditions developed in 2018, the hydrothermal coefficient for the growing season was 1.3, the average yield in the experiment was 2.02 c/ha. Stress conditions associated with waterlogging during the critical period of growth and development of fiber flax plants (GTC in June and July 1.7 and 1.8, respectively) took place in 2017, the average yield in experience was 1.03 c/ha. The highest yield of flax fiber (1.78-1.97 t/ha) on average over three years (2017 - 2019) was shown by the varieties Caesar, Sinel, Dobrynya (Russia), Marylin (Holland), Belita (Republic of Belarus), Andrea and Altea (France). Under stressful conditions (index of environmental conditions -0.51), Caesar (157.7%), Chenille (152.9) and Dobrynya (137.4) have high adaptability.

Variation of morphological indicators of three-line hybrids sunflower and their parental forms

2021 ◽  
pp. 43-54
Keyword(s):  
Plant Growth ◽  
Plant Height ◽  
Correlation Coefficient ◽  
Pollen Fertility ◽  
Correlation Coefficients ◽  
Weather Conditions ◽  
Growing Season ◽  
Hydrothermal Coefficient ◽  
Average Plant ◽  
Fertility Restorers

The article presents the results of three-year (2016–2018) studies of five three-line hybrids of the IMC selection - Agent, Agronomichny, Marshal, Kamenyar, Zaporozhskij 28 and their parent components - simple unreduced hybrids - ZL22A/102B, ZL42A/46B, ZL42A/58B and pollen fertility restorers – ZL512V, ZL678V and ZL7034V. It was found that individual indicators do not change synchronously. The Agent, Marshal and Kamenyar hybrids had the highest plant height in 2016, one each in 2017 – Agronomichny and in 2018 – Zaporozhskij 28. At the same time, three hybrids (Agent, Agronomical, Marshal) had the largest basket diameter in 2018 and two (Zaporozhskij 28, Kamenyar) in 2017. The shortest growing season hybrids Marshal, Zaporozhskij 28 and Kamenyar had in 2016 (90, 105 and 105 days), and two – Agent and Agronomichny in 2018 – 100 and 103 days, respectively. Among the simple unrecovered hybrids, two – ZL42A/46B and ZL42A/58B had high indicators of plant height, basket diameter and duration of the growing season in 2016. In the ZL22A/102B hybrid, the diameter of the basket was also the largest in 2016 (18.5 cm), the average plant height in 2016 – 124.5 cm was slightly lower than in 2018 (125.4 cm), also in these years in it almost coincided with the duration of the growing season – 97 days in 2016 and 96 in 2018 Fertility restorers had the highest indicators of plant height and basket diameter in 2017, also this year they had the shortest growing season, in 2016, on the contrary, they had the lowest height and the diameter of the basket, and the long growing season. The size of the baskets in the Marshal and Kamenyar hybrids correlates with the moisture supply of plants and the hydrothermal coefficient – the correlation coefficients are 0.997, 0.902 and 0.990, 0.973, respectively. The phases of organogenesis of plants of hybrids Kamenyar and Zaporozhskij 28 are greatly influenced by temperature, the correlation coefficient of this indicator with plant height and with the duration of the growing season is 0.996 for Kamenyar and 0.946 for Zaporozhskij 28, and with a hydrothermal coefficient – 0.939 and 0.753. In the Agent hybrid, the temperatures in June have the greatest influence on plant growth - the correlation coefficient is 0.997 and precipitation in May is 0.968, and the temperatures in May - 0.999 and June - 0.998 on the size of the basket. For the height of plants and the duration of the growing season at Agronomichny, moisture availability at the beginning of the growing season is very important, the correlation coefficients are 0.918 and 0.994, and in August during the filling of seeds 0.996 and 0.927, as well as July precipitation is 0.995. Of the simple unrecovered hybrids, the most demanding for heat is ZL22A/102B - the correlation coefficients are 0.941 with plant height and vegetation duration, 0.843 with the basket size. For ZL42A/58B, the most important are the May precipitation, their correlation with the vegetation duration of 1,000 and the basket diameter of 0.987, and the July temperatures - 0.999 and 0.993, respectively. Among the pollen fertility restorers, the line ZL512V turned out to be the most demanding to weather conditions. For plant growth, the temperatures of April (0.906), May (0.995) and June (1.000) are very important, for the duration of the growing season respectively – 0.958, 0.971 and 0.991, and for the size of the basket, precipitation in May (0.956) and July temperatures (0.943). The correlation coefficient with the sum of active temperatures is – 0.829 for plant height – 0.851 for basket diameter – 0.902 for the growing season.

The influence of climatic factors on the duration of the growing season and the yield of early maturing soybean varieties in the Central Region of the Non-Black Earth Zon

2021 ◽  
Author(s):  
T.D. Sikharulidze ◽  
◽  
A. S. Stefansky
Keyword(s):  
Air Temperature ◽  
Central Region ◽  
Climatic Factors ◽  
Growing Season ◽  
Average Yield ◽  
Early Maturing

The duration of the growing season of soybean varieties increased against the background of excessive precipitation and low air temperature. The smallest it was in the varieties Kasatka and Svetlaya (on average 100 and 102 days). The most productive is the Svetlaya variety - the average yield is 1.73 t / ha, the maximum - 2.76 t / ha.

scholarly journals ASSESSMENT OF SUNFLOWER HYBRIDS AFTER ECONOMICALLY VALUABLE FEATURES AND PHENOTYPIC PLASTICITY

2020 ◽  
pp. 37-43
Author(s):  
В.И. Грязева ◽  
Ю.В. Корягин ◽  
Н.В. Корягина ◽  
Н.И. Сигов
Keyword(s):  
Phenotypic Plasticity ◽  
Growing Season ◽  
Plasticity Index ◽  
Limiting Factors ◽  
Oilseed Crop ◽  
Average Yield ◽  
Adaptive Potential ◽  
Economically Valuable Traits ◽  
The Russian Federation ◽  
Selection Of

Подсолнечник в Российской Федерации – это основная масличная культура. Для рекомендации оптимальных регионов возделывания и активного внедрения в производство сортов и гибридов подсолнечника важно знать адаптивный потенциал, который оценивают по величине параметров экологической пластичности и стабильности. Выбор сорта должны определять лимитирующие факторы того региона, в котором его будут выращивать. В условиях Пензенской области изучены гибриды подсолнечника компаний Сингента (четыре гибрида), Евралис (один гибрид), Майсадур (один гибрид) и Пионер (один гибрид) по комплексу хозяйственно-ценных признаков и экологической пластичности. Установлено, что самый короткий период вегетации был у гибрида Бакарди и составил 114 дней. Более позднеспелым оказался гибрид компании Майсадур Мас 80 ИР, вегетационный период которого составил 125 дней. Высота растений у изучаемых гибридов подсолнечника находилась в пределах 166-174 см. Низкорослым гибридом в опыте был гибрид Амис компании Евралис, высота которого составила 166 см, а высокорослым гибрид Фортими (174 см). В среднем за два года урожайность гибридов подсолнечника в опыте колеблется от 2,05 до 3,25 т/га. Средняя урожайность по всем гибридам составила 2,7 т/га. Превысили среднюю урожайность гибриды компании Сингента – Фортими (2,9 т/га), Тристан (2,85 т/га), Бакарди (3,25 т/га) и гибрид ПЕ 63 ЛЕ 10 компании Пионер (2,95 т/га). Индекс экологической пластичности изменяется от 0,76 до 1,2. Экологически пластичными являются все гибриды компании Сингента (Неома, Фортими, Тристан, Бакарди) и гибрид компании Пионер (ПЕ 63 ЛЕ 10). Индекс экологической пластичности, соответственно, равен 1,0-1,2 и 1,09. Остальные гибриды требуют к себе повышенного внимания при возделывании. Sunflower in the Russian Federation is the main oilseed crop. To recommend the optimal cultivation regions and the active introduction of sunflower varieties and hybrids into production, it is important to know the adaptive potential, which is assessed by the value of the parameters of phenotypic plasticity and stability. The selection of a variety should be determined by the limiting factors of the region in which it will be grown. In the conditions of the Penza region, sunflower hybrids of Syngenta (four hybrids), Euralis (one hybrid), Maysadur (one hybrid) and Pioneer (one hybrid) were studied for a set of economically valuable traits and phenotypic plasticity. It was found that the Bacardi hybrid had the shortest growing season of 114 days. The Mas 80 IR hybrid by Maysadur turned out to be late ripening, the growing season of which was 125 days. The plant height in the studied sunflower hybrids was in the range of 166-174 cm. The low-growing hybrid in the experiment was the Amis hybrid by Euralis, the height of which was 166 cm, and the tall one was the Fortimi hybrid (174 cm). On average, for two years, the yield of sunflower hybrids in the experiment ranged from 2.05 to 3.25 t/ha. The average yield for all hybrids was 2.7 t/ha. The Fortimy (2.9 t/ha), Tristan (2.85 t/ha), Bacardi (3.25 t/ha) hybrids by Syngenta and the PE 63 LE 10 hybrid by Pioneer (2.95 t/ha) exceeded the average yield. The phenotypic plasticity index varied from 0.76 to 1.2. All hybrids of the Syngenta company (Neoma, Fortimi, Tristan, Bacardi) and the hybrid of the Pioneer company (PE 63 LE 10) are environmentally plastic. The phenotypic plasticity index is 1.0-1.2 and 1.09, respectively. The rest of the hybrids require increased attention during cultivation.

scholarly journals WEATHER CONDITIONS IN THE 2013 -2015 GROWING SEASONS FOR MAIZE IN CROATIA AND BOSNIA AND HERZEGOVINA

AGROFOR ◽  
2016 ◽  
Vol 1 (1) ◽  
Author(s):  
Vlado Kovačević ◽  
Vojo Radić ◽  
Dario Iljkić ◽  
Jurica Jović ◽  
Meho Majdančić
Keyword(s):  
Weather Conditions ◽  
Growing Season ◽  
Maize Yield ◽  
Weather Data ◽  
Average Yield ◽  
Main Field ◽  
Growing Seasons ◽  
Temperature Regimes ◽  
Banja Luka ◽  
Precipitation And Temperature

Maize is the main field crop on the arable lands in Croatia and Bosnia andHerzegovina (B&H). In the 2001-2010 period, maize was grown on 333,736 ha(average yield 6.50 t ha-1) in Croatia and 195,800 ha (4.42 t ha-1) in B&H. Yieldvariations among years were from 3.86 to 7.98 t ha-1 and from 2.74 to 5.13 t ha-1,respectively. Aim of this study was survey of maize yield and weather data(precipitation and mean air temperature) in Croatia and B&H in the 2013, 2014 and2015 growing seasons. Average yields of maize were 6.5, 8.1 and 6.5 t ha-1(Croatia), 4.0, 5.0 and 4.1 t ha-1 (B&H) in 2013, 2014 and 2015, respectively.The 2014 growing season was very favorable for maize growth. Precipitation andtemperature in April-September period were as follows: 520 mm and 18.2oC(Osijek), 910 mm and 17.2oC (Varazdin), 731 mm and 18.5oC (Bijeljina), 1228 mmand 18.0oC (Banja Luka). These precipitation values are higher by 41% (Osijek),75% (Varazdin and Bijeljina), and 116% (Banja Luka) compared to averages 1961-1990. In extremely unfavorable 2012 (yield 4.34 and 2.74 t ha-1, in Croatia andB&H, respectively), precipitation and temperature at the same period were 293 mmand 20.0oC (Osijek), 461 mm and 18.8oC (Varazdin), 288 mm and 21.0oC(Bijeljina), 488 mm and 20.1oC (Banja Luka). However, in 2013 and 2015, yields,precipitation and temperature regimes in both countries were more close to averagevalues. Considerable variation of precipitation in the short 2012 -2014 period andhigher temperatures are in accordance with climate change.

scholarly journals The influence of methods of pre-sowing seed treatment and weather condition on the yield of standart bean varieties

2019 ◽  
Vol 2019 (1) ◽  
pp. 125-132
Author(s):  
L.M. Potashova ◽  
Yu.M. Potashov
Keyword(s):  
Seed Treatment ◽  
Weather Condition ◽  
Soil Surface ◽  
Weather Conditions ◽  
Average Yield ◽  
Nodule Bacteria ◽  
Hydrothermal Coefficient ◽  
Correlation And Regression Analysis ◽  
Yield Capacity ◽  
Sowing Seed

The results of 18-year researches of influence of pre-sowing seed treatment methods and weather conditions on yield capacity of trunk varieties of beans of Pervomaisk and Dokuchaevsk are given. The pre-sowing seed treatment was carried out in two ways: on control - moistening with water, on other variants - inoculation with a suspension of strains of nodule bacteria. It has been established that over the years of the research the average yield of Pervomaisk beans was 1,68 t/ha in the control, in the variant with the most active rhizobia strains – 1,93 t/ha; Dokuchaevskaya variety yield capacity made up 1,72 and 1,95 t/ha, respectively. During the bean growing season, such climatic indicators as the amount of theb precipitation, the sum of the active temperatures, the hydrothermal coefficient, the relative humidity of the average and minimum, the minimum temperature on the soil surface, the maximum wind speed have been determined. The correlation and regression analysis proved that the yield capacity of beans is most affected by the amount of precipitation and the sum of the active temperatures for the period from sowing to harvesting. It is the indicator of their joint action - the hydrothermal coefficient that most significantly correlates with the yield capacity (r = 0,50–0,58). Key words: beans, trunk varieties, inoculation, rhizobia strains, yield capacity, weather conditions, correlation.

Irrigation regime and water consumption of potatoes in the Republic of Bashkortostan, depending on the reclamation condition of lands

2020 ◽  
Vol 0 (6) ◽  
pp. 13-19
Author(s):  
Guzel Gumerova ◽  
Georgiy Gulyuk ◽  
Dmitry Kucher ◽  
Anatoly Shuravilin ◽  
Elena Piven
Keyword(s):  
Water Consumption ◽  
Weather Conditions ◽  
Growing Season ◽  
Vegetation Period ◽  
Forest Steppe ◽  
Total Water ◽  
Total Water Consumption ◽  
Republic Of Bashkortostan ◽  
Irrigated Lands ◽  
The Republic

Data of long-term researches (2015–2018) in southern forest-steppe zone of the Republic of Bashkortostan, is justified theoretically and experimentally the mode of irrigation of potatoes on leached chernozems of unsatisfactory, satisfactory and good ameliorative condition of irrigated lands. For the growing periods of potatoes with different heat and moisture supply, the number of watering, the timing of their implementation, irrigation and irrigation norms are established. On lands with unsatisfactory meliorative state the number of irrigation depending on weather conditions of potato vegetation period varied from 0 to 3 (1.5 on average) with average irrigation norm – 990 m3/ha. With satisfactory meliorative state of lands the number of irrigation on average increased from 0 to 4 (2.3 on average) with irrigation norm – 1305 m3/ha. On lands with good meliorative state the number of irrigation was the highest – from 1 to 5 (3 on average) with average irrigation irrigation norm is 1653 m3/ha. It was noted that in the dry periods of potato vegetation the greatest number of watering was carried out (3–5 watering), and in the wet periods (2017) watering was not carried out except for the area with a good reclamation state, where only one irrigation was carried out by the norm of 550 m3/ha. Water consumption of potato was studied in dynamics as a whole during the growing season and the months of the growing season depending on weather conditions of vegetation period and land reclamation condition of irrigated lands, as well as in the control (without irrigation). The lowest total water consumption was in the area without irrigation and averaged 226.8 mm. In irrigated areas, its values increased to 319-353.4 mm. The average daily water consumption varied from 2.12 to 3.3 mm. The highest rates of potato water consumption were observed in June and July, and the lowest – in May and August. In the total water consumption of potatoes on the site without irrigation, the largest share was occupied by atmospheric precipitation and in addition to them the arrival of moisture from the soil. Irrigation water was used in irrigated areas along with precipitation, the share of which was 30.2–46.1 %.

scholarly journals Effect of different soil and weather conditions on efficacy, selectivity and dissipation of herbicides in sunflower

2020 ◽  
Vol 66 (No. 9) ◽  
pp. 468-476
Author(s):  
Miroslav Jursík ◽  
Martin Kočárek ◽  
Michaela Kolářová ◽  
Lukáš Tichý
Keyword(s):  
Cation Exchange Capacity ◽  
Chenopodium Album ◽  
Soil Layer ◽  
Weather Conditions ◽  
Growing Season ◽  
Application Rate ◽  
Exchange Capacity ◽  
Vertical Transport ◽  
Application Rates ◽  
High Precipitation

Six sunflower herbicides were tested at two application rates (1N and 2N) on three locations (with different soil types) within three years (2015–2017). Efficacy of the tested herbicides on Chenopodium album increased with an increasing cation exchange capacity (CEC) of the soil. Efficacy of pendimethalin was 95%, flurochloridone and aclonifen 94%, dimethenamid-P 72%, pethoxamid 49% and S-metolachlor 47%. All tested herbicides injured sunflower on sandy soil (Regosol) which had the lowest CEC, especially in wet conditions (phytotoxicity 27% after 1N application rate). The highest phytotoxicity was recorded after the application of dimethenamid-P (19% at 1N and 45% at 2N application rate). Main symptoms of phytotoxicity were leaf deformations and necroses and the damage of growing tips, which led to destruction of some plants. Aclonifen, pethoxamid and S-metolachlor at 1N did not injure sunflower on the soil with the highest CEC (Chernozem) in any of the experimental years. Persistence of tested herbicides was significantly longer in Fluvisol (medium CEC) compared to Regosol and Chernozem. Dimethenamid-P showed the shortest persistence in Regosol and Chernozem. The majority of herbicides was detected in the soil layer 0–5 cm in all tested soils. Vertical transport of herbicides in soil was affected by the herbicide used, soil type and weather conditions. The highest vertical transport was recorded for dimethenamid-P and pethoxamid (4, resp. 6% of applied rate) in Regosol in the growing season with high precipitation.  

scholarly journals Comparison of the Radial Growth Response of Picea crassifolia to Climate Change in Different Regions of the Central and Eastern Qilian Mountains

Forests ◽  
2021 ◽  
Vol 12 (8) ◽  
pp. 1015
Author(s):  
Xuan Wu ◽  
Liang Jiao ◽  
Dashi Du ◽  
Changliang Qi ◽  
Ruhong Xue
Keyword(s):  
Climate Change ◽  
Tree Growth ◽  
Central Region ◽  
Radial Growth ◽  
Growing Season ◽  
Qilian Mountains ◽  
Growth Patterns ◽  
Total Precipitation ◽  
Picea Crassifolia ◽  
The Qilian Mountains

It is important to explore the responses of radial tree growth in different regions to understand growth patterns and to enhance forest management and protection with climate change. We constructed tree ring width chronologies of Picea crassifolia from different regions of the Qilian Mountains of northwest China. We used Pearson correlation and moving correlation to analyze the main climate factors limiting radial growth of trees and the temporal stability of the growth–climate relationship, while spatial correlation is the result of further testing the first two terms in space. The conclusions were as follows: (1) Radial growth had different trends, showing an increasing followed by a decreasing trend in the central region, a continuously increasing trend in the eastern region, and a gradually decreasing trend in the isolated mountain. (2) Radial tree growth in the central region and isolated mountains was constrained by drought stress, and tree growth in the central region was significantly negatively correlated with growing season temperature. Isolated mountains showed a significant negative correlation with mean minimum of growing season and a significant positive correlation with total precipitation. (3) Temporal dynamic responses of radial growth in the central region to the temperatures and SPEI (the standardized precipitation evapotranspiration index) in the growing season were unstable, the isolated mountains to total precipitation was unstable, and that to SPEI was stable. The results of this study suggest that scientific management and maintenance plans of the forest ecosystem should be developed according to the response and growth patterns of the Qinghai spruce to climate change in different regions of the Qilian Mountains.

Selection of drought-resistant crops for South Steppe of Ukraine

2021 ◽  
Vol 5 (1) ◽  
pp. 13-22
Author(s):  
V. V. Gamayunova ◽  
L. H. Khonenko ◽  
M. I. Fedorchuk ◽  
O. A. Kovalenko
Keyword(s):  
Humus Content ◽  
Soil Layer ◽  
Weather Conditions ◽  
Growing Season ◽  
Grain Sorghum ◽  
Climatic Conditions ◽  
Mineral Fertilizers ◽  
Chemical Application ◽  
Sowing Dates ◽  
Drought Resistant

The cultivation expediency of more drought-resistant crops, in particular sorghum, millet, false flax, safflower and others, instead of sunflower in the area of the Southern Steppe of Ukraine is substantiated. This is, first of all, required by climate change both in Ukraine and in the world. Since 2004, researches of field crops were carried out in the conditions of the Educational and Scientific Practical Center of the Mykolaiv National Agrarian University. Soil phase is the southern chernozem with humus content in the 0–30 cm soil layer which consist of 2.96–3.21 %, with medium and high level of availability of mobile phosphorus and potassium and low – mobile nitrogen. Experiments with soriz (Oksamyt hybrid) were conducted during 2004–2006, millet (Tavriiske, Kostantynivske, Skhidnevarieties) in 2008–2010, grain sorghum (Stepovyi 5 hybrid) in 2014–2016, safflower dye (Lahidnyi variety) in 2017–2019. The years of research differed significantly in temperature and even more in the amount of precipitation before sowing and during the growing season of crops. However, the weather conditions were typical of the Southern Steppe zone of Ukraine. It is established that all studied drought-resistant crops respond positively to nutrition optimization – the level of yield and quality of grain or seeds increases. It was found that the soriz productivity depending on the application of fertilizers and sowing dates increased by 37.6–39.2 %, millet –by 33.3–41.6 %, grain sorghum depending on the background of nutrition and growing conditions – by 8.2–33.2 %, dye safflower – by 11.1–64.6 %. It was determined that the optimization of nutrition of cultivated crops allows to increase their resistance to adverse conditions and productivity in the case of application of low doses of the mineral fertilizers before sowing, pre-sowing treatment of seeds, and growth-regulating chemical application of plants on the main stages of the growing season. Key words: drought-resistant plants, climatic conditions, nutrition optimization, yield, crop quality, varieties, sowing dates.

CHANGES IN THE HYDROTHERMAL COEFFICIENT AND IN THE FREQUENCY OF EXTREME HUMIDIFICATION CONDITIONS ON THE TERRITORY OF BELARUS DURING CLIMATE WARMING

2020 ◽  
pp. 5-18
Author(s):  
Yuliya A. Brovka ◽  
Ivan V. Buyakov
Keyword(s):  
Climate Warming ◽  
Growing Season ◽  
Northern Region ◽  
Meteorological Station ◽  
Spatial Change ◽  
Hydrothermal Coefficient ◽  
Arid Conditions ◽  
Moisture Supply ◽  
Moisture Conditions ◽  
Heat And Moisture

It is important to study the heat and moisture supply of the territory under climate warming conditions in Belarus since 1989, as well as changes in the occurrence frequency of extreme moisture conditions. The features of the spatial change in the averaged hydrothermal coefficient (HTC) for the period of climate warming (1989–2019) and the colder period preceding it (1960–1988) in the months of the growing season were revealed based on the maps constructed by interpolation. A decrease in the aridity of conditions in May and September in the southeast and east of the country, an increase in aridity in June and August (especially in the southern regions), an increase in the area with excessive moisture in July and its decrease in September were defined. The article shows the features of changes in the frequency of droughts (HTC ≤ 0,7), less arid conditions (HTC = 0,71–1,0) and excessive moisture (HTC > 1,6) from May to September in 1989–2019, according to compared with the period 1960–1988. It was found that during the period of climate warming from May to September, there is a significant increase in the droughts frequency at meteorological stations in various regions of Belarus. A decrease in the number of years with drought in May and June is observed at several eastern and southern meteorological stations, in August – at the Zhitkovichi meteorological station, in September – at the Kostyukovichi meteorological station. The frequency of arid conditions in May, July and September decreases at many meteorological stations, and its changes are characterized by territorial heterogeneity. An increase in the number of years with less arid conditions is observed in most of Belarus in June and August. A significant increase in the frequency of excessive moisture was noted in July in most of the territory of Belarus, in May – in some regions. A decrease in the frequency of excessive moisture is observed at many meteorological stations in June and August; the number of years with excessive moisture increases only in the northern region. Spatial heterogeneity and less pronounced changes in the frequency of excessive moisture are noted in September.

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