No 3 (2023)

Due to the increased aridization of the environment in the main agricultural zones of the Don, the parameters of the model of winter soft wheat varieties of intensive and semi-intensive types have been clarified. At the present stage, the potential productivity of intensive wheat at a high agrofone is 9,0-10,5 t/ha of grain, which is due to the productive stem of 660-800 ears/m2. In semi-intensive varieties on the average agrophone, the values of these indicators are respectively 7,0-7,5 t/ha and 580-620 ears/m2. The productivity of the ear, respectively, should be 1,2-1,5 g and 1,1-1,2 g and with a grain share in the cenosis of 40-45% and 36-38%, respectively. With different stress factors, the peculiarities of the formation of agroecotypes of new varieties were revealed. The selection criterion for drought-resistant productive forms was the selection of genotypes with a high yield index. However, the main trend related to productivity and adaptability in drought conditions is the creation of new genotypes with increased grain weight from the plant and from the ear. This is the most objective integrated assessment of their drought resistance. The progress in the yield growth of semi-dwarf and medium-sized wheat varieties is also due to an increase in the capacity of cenosis. as a result of the use of new parameters of the model of intensive and high-intensity genotypes, varieties of winter soft wheat Donmira, Akapella, Bogema, Bylina Dona i Pal'mira 18, Kuryanochka 19, Pafos, developed for the Central Chernozem, North Caucasus, Lower Volga, Middle Volga and Ural regions, were created and included in the State Register of Breeding Achievements in 2019-2022. These varieties are well adapted for arid regions according to the complex of breeding and valuable traits.

In 2019-2021 the 1985 samples of spring soft wheat from the world collection of the Vavilov N.I. All-Russian Institute of Plant Genetic Resources named after (VIR) on a set of selection-valuable traits. Field and laboratory evaluations were carried out according to the VIR guidelines. As a result of the field study, samples of spring soft wheat with a complex of breeding valuable traits and combining high grain productivity were identified. Particularly important for breeding are samples that combine resistance to a complex of diseases (powdery mildew, brown and yellow rust) with high productivity from India - k-6414, k-5627, Afghanistan - k-12437.

The article presents the results of a study to identify the effectiveness of the use of Aktofit, Lepidocid, Aktara, Aktellik, Admiral and their tank mixtures against cotton budworm in the foothill zone of the Kabardino-Balkarian Republic. Sweet corn is a vegetable crop that is the most demanding on growing conditions and requires attention to itself. It is especially important to obtain high-quality sweet corn cobs. The yield and quality indicators of sweet corn cobs are significantly affected by such pests: meadow moth, stalk moth, cotton budworm, aphids, swedish fly, chickweed. The most dangerous among them is the cotton budworm, it is difficult to deal with it. The period of formation of butterflies is more than a month, during which time several generations appear. The cotton bollworm causes irreparable damage if no measures are taken to protect the cobs. The usage of different treatment schemes affected not only the number of the pest, but also the damage to the cobs, taking into account the lateral damage to the cobs. When selling cobs with upper damage, it is possible to cut off the damaged part and present it as a marketable one, and in case of lateral damage, the entire cob is rejected. Having carried out chemical and biological treatments, the number of lateral damaged cobs was noticeably reduced. This is due to the fact that the number of individuals decreased sharply and did not have time to breed on the sides of the cobs. It was found that without the use of treatments, the length of damage to the cobs reached 3.5 cm. In the variants with the Aktara + Admiral tank mixture, the length of damage to the cobs was 1.3 cm, and ac Aktara + Aktellik - 1.5 cm. Thus, the best treatment scheme was determined: 1. Aktara + Actellik (0.1+0.5 l/ha); 2. Aktara + Admiral, (0.1+0.5 l/ha), which had the lowest indicators: the number of damaged ears, the length of the damage and the number of ears with lateral damage, as well as the percentage of marketable yield was higher.

The influence of different technological methods of planting and care, different in the number of treatments and timing of formation of a full ridge profile on the agrophysical properties of soil, the formation of yields in the cultivation of new varieties of potatoes of Kamchatka breeding, to improve the existing technology was studied. Rolling the soil when planting potatoes, contributed to the conservation of moisture in the soil at an average of 1.6%. During the vegetation period soil moisture was the highest at potato planting with soil consolidation and ridging in the period of mass sprouts and made up 36,65 % at 34,04 % in the control. On the average during the vegetation period, the soil volume weight in the layer 0-15 cm varied within the range 0,64-0,66 g/cm3 and was optimal for potatoes. Application of new technological methods in growing potatoes had a positive effect on the structural and aggregate state of the soil. At different system of care during vegetation the maximum size of a ridge was formed at early ridge formation with filling of shoots, the ridge height before harvesting averaged 24.5 cm, and the area of cross-section 930.4 cm2, increase to the control - 16.0 cm and 572.6 cm2 respectively. This method created favorable conditions for the development and accumulation of potato yield, the yield of the variety Geyser was 37.6 t/ha, Vulkan - 33.3 t/ha. Covering of soil at planting and ridge forming during the period of mass potato shoots promoted the increase of the crop capacity of the variety Geyser by 4,7 t/ha (14,3 %), Vulkan - 3,7 t/ha (12,5 %), due to soil rolling the increase of the crop capacity on the variety Geyser was on the average 4,0 %, Vulkan - 2,6 %, due to ridge forming - 10,0 %, 9,6 % respectively.

Russian Research Institute of Fruit Crop Breeding (VNIISPK) is the oldest breeding and pomological institution of Russia and one of the main suppliers of new apple cultivars in Central Russia. To date, the Institute has created and included in the State Register 56 apple cultivars of different maturation periods for the conditions of the Middle zone of Russia. In addition, our Institute took part in the creation of a number of cultivars for the North Caucasus. We have numerously drawn attention to the value of apple varieties of folk selection in creating adaptive, competitive cultivars. In this paper we tried to show the role of the tetraploid form of Papirovka of folk selection in the creation of new summer triploid cultivars with more regular fruiting and more marketable fruits. 20 cultivars have been created with the participation of the varieties of folk selection, including six cultivars with the participation of Antonovka Krasnobochka: Zarianka, Orlovsky Pioner, Pamyat Isaeva, Patriot, Svezhest and Slavyanin; five cultivars with the participation of tetraploid Papirovka: Avgusta, Dariona, Maslovskoye, Osipovskoye and Yablochny Spas; five cultivars with the participation of folk variety Antonovka Obyknovennaya widely distributed in the central part of Russia: Zdorovie, Imrus, Morozovskoye, Orlovim and Pamyat Voinu; three cultivars with the participation of Skryzhapel: Bolotovskoye, Vavilovskoye and Nizkorosloye; Ranneye Aloye with the participation of Papirovka (diploid). Of particular interest, in our opinion, are the summer triploid cultivars obtained with the participation of the variety of folk selection Papirovka tetraploid.

The study of the possibility of using low-growing clonal rootstocks in the conditions of the South Сisbaikal, the territory most suitable for horticulture in the Irkutsk region, was the goal of this work. The studies were carried out in 2017-2022 on experimental plots, which are located in the Irkutsk district of the Irkutsk region and on the territory of SIPPB SB RAS (Irkutsk). Assembled collection was included: six varieties of clonal rootstocks bred by MichGAU (62-396, 54-118, 70-20-20, 70-6-8, 64-143, 62-223), stock bred by A.P. Apoyan (Armenian RIVWFG) (Arm18), rootstock of Estonian selection (E56), eight rootstocks of Orenburg ESHV selection (Ural, Ural2, Ural5, 18-7, B-3-4, 4-12, 8-2, OB), rootstock Crimean OSH (K-2). The conducted field observations allow us to state that clonal rootstocks can be used in horticulture in the South Сisbaikal. We found out that of all the studied clonal rootstocks, the rootstocks of the Ural selection Ural and Ural 2 and the rootstock of the Estonian selection E-56 showed high winter hardiness. We attributed clonal rootstocks 70-6-8, Arm18, K-2 to low winter-hardiness. The rest of the rootstocks over the years of research showed an average winter hardiness. The results of laboratory studies confirmed the high winter hardiness of E-56. The study of cultivar-rootstock combinations showed good compatibility of clonal rootstocks with semi-cultivated apple trees: strong fusion of the rootstock with the scion, active growth, well-developed leaf apparatus, the absence of any signs of starvation and discoloration. It has been statistically proven that the variety and type of rootstock affect the degree of temperature damage to the fruit tree. Highly winter-hardy clonal rootstocks and medium-hardy clonal rootstocks with high regenerative capacity were selected as promising for breeding.

The effectiveness of ameliorative strip loosening to a depth of 50-60 cm and volumetric soil slotting to 45-50 cm, their influence on the productivity of field crops and agrophysical properties of drained soils with different ameliorative systems (interdrainage distance of 18 and 28 m) was studied. The experiment was carried out in the period 2015-2021. at the Gubino agricultural polygon of the All-Russian Research Institute of Reclaimed Lands (Tver Region). The soil is soddy-podzolic cultivated light loamy gleyic, drained by closed pottery drainage, formed on a moraine. Volumetric slotting was carried out with a specially designed tool with filling the subarable part of the slot with crushed straw and plant residues mixed with a humus layer. Ameliorative loosening (MR) was carried out with a converted chisel plow. The pitch of slotting and MP is 140 cm. According to the generalized data, the best results on both drainage systems were obtained in the variant with volume slotting. Ameliorative loosening increased the yield of grain crops, on average over 5 years, by 0.60 t/ha (17.0%) and 0.79 t/ha (20.7%), slotting by 0.90 and 1.02 t/ha ha (25.6 and 26.7%), respectively. Additional grain harvest for the five-year period of MR action on the estimated drainage was 3.0, on sparse - 3.95 t/ha, and with volumetric slotting of the soil - 4.5 and 5.1 t/ha, respectively. On spring rapeseed, the best results were also obtained in the variant with sparse drainage and volumetric slotting of the soil. The increase in the yield of green mass in this variant, on average over 3 years, amounted to 3.6 t/ha of green mass, or 19.0%. It has been established that on soddy-podzolic light loamy gleyic soils with an atmospheric type of water supply, when designing ameliorative systems for field crop rotations, it is possible to use drainage systems with extended, compared to the calculated, interdrainage distances, which helps to reduce the cost of drainage. The use of land reclamation techniques increases the efficiency of sparse drainage.

The results of the genetic characteristics research of large and small cattle populations grown in the Southern Russia are stated. Breed-specific DNA patterns have been identified in three of the most common cattle breeds of meat productivity in arid conditions. The milk productivity of Holstein cows of different breeding lines has been studied. It was found that increasing the frequency of animals of Vis Back Ideal and Reflection Sovering lines in the parent pairs could be able to increase the level of milk productivity of offspring and improve the quality indicators of dairy raw materials. The adaptive abilities and milk productivity of imported foreign Holstein cows depending on their origin were estimated. In comparison with Australian and Danish Holstein cows, American and German analogues have a higher level of milk productivity. However Australian and Danish animals have a more flexible adaptive capacity. As a result of the comparative study of the economic and biological characteristics of two generations of Aberdeen-Angus cattle (parental foreign generation, and the first generation - obtained under breeding conditions in Southern Russia), tendencies to increase productive values are revealed. The features of the meat productivity formation in Kalmyk steers different exterior and constitutional types are investigated. It was found that the Kalmyk steers of the tall body type have a higher meat productivity compared with their analogues of medium and compact body types. However, the beef of compact steers has a higher fat percentage, more attractive taste characteristics, culinary and technological indices. The features of polymorphism of CAST, GH, GDF9, CLPG, FABP4 and MC4R genes in populations of sheep of different breeds grown in the Republic of Kalmykia, Volgograd and Rostov regions, Kabardino-Balkaria Republic were also studied. As a promising method of early diagnosis of presence economically useful traits in sheep during ontogenesis, the effectiveness of DNA analysis in young lambs and the further selection of animals with desirable genotypes according to these genes were justified.

Vyatka breed is a valuable small native breed of horses. The study of the determination of suits is of significant practical importance in breeding. This is especially true for small breeds. The purpose of the research is to monitor the color and markings as important genetic markers of preservation the Vyatka breed gene pool. To meet the objective, the following tasks were set: to evaluate the structure of suits in a microevolutionary aspect and to study the polymorphism of the MC1R and ASIP genes, determine the basic suits, the “lightening” genes TBX3 and MATP, determining the desired suits in the breed, as well as to evaluate the influence of the TBX3 and W20 genes, giving the desirable "wild" markings and undesirable whites. The object of the study is Vyatka horses born in 1975-2022 (n=2949) registered in the breed database. DNA extraction from hair follicles of Vyatka horses (n=86) was carried out in the “HorsGen” laboratory (Moscow) using “ExtraGene DNA Prep” (“Isogen”, Moscow). Single nucleotide polymorphisms (SNPs) were identified by allele-specific PCR. The calculations were performed using MS Excel 10. Prevailing colors in the Vyatka breed - dun (56.9%) and grullo (31.7%). Of commercial interest are the colors determined by the Dun + Cream genes (3.2%). The occurrence of the D/D genotype in the Vyatka breed is low (0.167), so there are non-dun colors (5,2%). All TBX3 genotypes were identified with a predominance of D/nd1 (0.405). The relationship between the TBX3 gene and white markings has not been found, but with a shade of color and “wild” markings, it has been identified. The D/nd1 genotype is more common in medium (0.440) and light (0.714) horses, with D/nd2 (0.455) predominating in darker individuals. Noticeable "wild" markings prevail in horses with the D/nd1 genotype (0.539), their absence was found only in species with D/nd2. The MC1R/EE genotype is predominant in horses without white markings (0.612) and those with small markings (0.500). The occurrence of the W20 allele in Vyatka breed is low (0.146) and affects the size of white marks: the lowest was noted in animals without marks, the highest - with large marks. Since the color is an important genetic marker and selection trait, genotyping of breeding stallions and mares for the set of genes associated with the colors and markings is important.

Today, the issues of ecology, resource conservation and reduction of production costs in agriculture are associated with the development of combined tillage - sowing machines, which make it possible to reduce a number of technological techniques. Taking into account these factors makes it possible to equip agricultural enterprises with means of mechanization adapted to the specific conditions of their production use. Therefore, a promising direction is the development of universal and combined machines, that is, technical means of mechanization capable of performing several technological operations in one working cycle or, after relatively simple retrofits, ensuring the consistent execution of a number of operations. To carry out experimental studies, an installation was developed and manufactured, which is a combined machine that provides pre-sowing tillage, strip spreading sowing, mineral fertilizers and post-sowing rolling. Using the experimental planning method, mathematical models have been developed that link factors such as the speed of the unit, the angle of attack of the coulter's paw, the depth of the coulter's paw when optimizing the degree of soil crumbling, pruning of weeds, changes in soil hardness. Analysis of mathematical models shows that factors in a certain way affect the quality of tillage (crumbling, hardness, pruning of plants). In the first place in terms of significant importance is the speed of movement. The degree of pruning of plants depends on the angle of attack. As for the depth of processing, this factor has practically no effect on the degree of pruning of weeds. This can be explained by the fact that the root system is located at a shallow depth. For other cultures, this factor may play a significant role.