В статье показаны особенности формирования продуктивности донника (Melilotus L.) в зависимости от норм высева покровного ячменя (Hordeum vulgare L.) и доз минеральных удобрений на засоленных почвах Приаралья, а также предлагается вариант технологии возделывания ячменя с подсевом многолетних трав. Известно, что донник является отличным фитомелиорантом. Нужно также отметить перспективность и ценность донника, которые заключаются в его исключительной способности давать высокие урожаи кормовой массы на засоленных участках, его способность окультуривать почву, делая ее пригодной для посева других культур, в данном случае риса.Исследования показали, что на урожайность покровной культуры существенное влияние оказывает как норма высева, обеспечивающая прибавку урожайности ячменя на 0,37 т/га, так и внесение удобрений в дозах N 30 Р 60 и N 60 Р 60 , при которых, прибавка составила 0,75 и 0,8 т/га, соответственно. В целом, формирование высокой урожайности донника обеспечивается нормой высева покровной культуры-2-3 млн. шт/га и дозы минеральных удобрений-N 30 Р 60 , при таком агрофоне значительно снижается угнетающее действие покровной культуры, увеличивается выживаемость растений донника на 10,4-27,5%, облиственность на 12-16,5%, урожайность на 22,0-55,1%.

In the Aral Sea basin of Kyzylorda region, Kazakhstan, rice (Oryza sativa L.) is a main crop and annually occupies more than 45% of the total area of agricultural crops. However, about 90% of Syr Daria River waters is consumed for agricultural purposes, mainly for irrigation of paddy fields. In addition, there is an annual variability in the volume of water during the growing season, which creates certain threats to ensuring guaranteed water supply to irrigated lands and may pose a desertification risks. In addition, in the studied region, due to insufficient application of phosphorus fertilizers nutrient imbalance has been observed in the soil. The aim of the research was to develop sustainable production of rice by introduction of diversified cultures such as barley, soybean and rapeseed: Hordeum vulgare (L.), Glycine max (L.) and Brassica napus (L.), respectively, in a rice-based crop rotation and application of the different doses of mineral fertilizers in the Kyzylorda region. The results of the study showed that application of phosphorus as the main fertilizer at a dose of 90 kg ha-1 gives a significant increase in yield. Studied barley and rapeseed crops showed better adaptability to the specific agroecological conditions. These crops are recommended to be introduced into the rice crop rotations in order to produce rice using environmentally friendly technology.

In the context of market relations in agriculture in the Kyzylorda region, in order to meet the needs of animal husbandry in complete feed, it is necessary to create a solid forage base. The successful solution to the tasks of increasing the number of livestock and increasing the productivity of animal husbandry in the ecological conditions of the Aral Sea region largely depends on the timely procurement of feed and the transfer of feed production to an industrial basis. It is possible to increase the production of high-quality feeds through the introduction of high-yielding varieties, the use of new resource-saving cultivation and harvesting technologies, the optimal organization of cultivation production processes, and increasing the efficiency of the use of technical means. Of all the harvested types of feeds, alfalfa has the best effect on increasing milks yield and meat gains. The green mass of alfalfa is well-eaten by all farm animals. For example, when feeding cattle, its utilization rate is 92.6%. In terms of protein richness, alfalfa hay surpasses many other feeds, so 100 kg of alfalfa hay contains 11.6 kg of digestible protein, 1.77 kg of calcium, 0.22 kg of phosphorus, and 4.5 g of carotene. In addition, in the conditions of rice crop rotation, according to its biological characteristics, alfalfa (Medicago sativa L.) is considered indispensable in agrotechnical and reclamation relations, especially in saline soils. The economic value of alfalfa lies in its wide ecological plasticity, the ability to grow back quickly after mowing, and high productivity.

The specifics of the soil and climatic conditions of the Aral sea region, Kazakhstan, primarily associated with salinization, various types of droughts, uneven distribution of precipitation during the growing season, and late spring frosts, make it necessary to create crop varieties with resistance to biotic and abiotic environmental factors. In this regard, the expansion of the area under crops of nontraditional salt-tolerant grain crops in the Kyzylorda region is one of the main directions of increasing the sustainability of agriculture in the region. Studies have shown that among the grain crops cultivated in the region, spring barley (Hordeum vulgare L.) is a reliable crop that can make the most of the region's bioclimatic resources to form sustainable yields. The purpose of this study is to create a new promising source material of barley based on a comprehensive study of collection material of various ecological and geographical origin by applying various methods of classical breeding. Based on a comprehensive assessment of the collection material of barley, a working collection of 250 varieties with agronomic resistance to environmental stress factors of the Aral Sea region was created. The selected samples are recommended for use in practical breeding in order to increase the adaptive potential of modern barley varieties.

Gamma irradiation technology is considered to be very promising for trait-based plant modification. The effect of g-irradiation on the germination, growth, and productivity of daughter generations of barley M1 and M2 is highly relevant. The aims of the study was the creation of a source material for barley breeding in the form of mutant lines with selectively valuable traits, by treating seeds with ionizing radiation using an electron accelerator of the Park of Nuclear Technologies JSC (Kurchatov, Republic of Kazakhstan); as well as to improve and expand the classical methods of breeding based on induced mutagenesis in creating an original gene pool of the source and breeding material of barley for the accelerated and effective introduction of stress tolerant(to salinization and drought) varieties into production in the conditions of Aral Sea impacted landscapes. Seeds of the two varieties of barley were treated with five doses of radiation (from 50 Gy to 250 Gy). The germination and various morphological characteristics of their seedlings at different growing phases were compared with the non-irradiated (control) treatment. The results of this preliminary study showed that both treated varieties were sensitive to the g-irradiation and showed suppressed morphological properties, where the highest dose of 250 Gy showed most inhibiting effect resulting in death of barely seedling. The results obtained will be applied for the further expanded research with other specified doses of g-ray treatment of seeds in order to create a basis in strengthening and deploying full-scale breeding work for diversified crop production in the region and improving existing varieties for further breeding.