The changing dynamics of agricultural lands throughout 2005-2020 has been investigated. Transformation of agricultural lands is related to various unresolved legislative issues. According to the research results the efficient use of agricultural lands is interfered with the current legislative environment, degradation factor, huge amount of unused soils registered in the agricultural land assets and soil fragmentation. To eliminate the mentioned factors and to reduce their effect, it is necessary to make legislative changes and to implement land management activities.

Formation of a cluster system in the agricultural sector of Armenia could enable to handle the current obstacles in the food value chain and to increase the economic efficiency in grain production. Implementation of the program on introducing a cluster system for cereal crop production in the Shirak region of the RA implies application of efficient branch management systems and innovative technologies in the farm households, targeted resource utilization, provision of competitive environment, as well as increase in the yield capacity and profitability of the cereal crops.

In 2018-2020 a new technology against the harmful flora of the lower Hrazdan and Artashat irrigation canals and collector-drainage systems at the Ararat valley was explored, scientifically justified and recommended for implementation. Physiologically active anti-weed preparations have been applied. In the irrigation systems, where cane is also widespread, Arsenal New and Uragan Forte have been used, while in the over-moistened collector-drainages Uragan Forte and in the cane-free areas Epic (Sado) and Anchor 85 have been used. In the result of new technology application the irrigation water losses are reduced and the proliferation of weeds and field dodder towards the land user’s fields is prevented.

There are limited raw material resources (apatites) for manufacturing phosphorus fertilizers. The studies have disclosed that the phosphorus fertilizers can be also produced from the phosphorus-containing biogenic diatomite rocks widely spread in Armenia. A technology of manufacturing a complex phosphorus fertilizer (phosphorus + iron + amorphous silicon dioxide) from the mentioned rocks has been developed. According to the results of trials on maize and spring barley the recommended fertilizer exceeds the superphosphates in its efficiency; anyhow, the technology of fabricating the discussed fertilizer still needs to be improved.

The aim of the research is to study the natural regrowth of the oak and to detect the most endangered forest areas. As compared to the data recorded in 1990, the oak seedlings and saplings have considerably decreased and unfavorable succession of tree species in the oak-forest have occurred as a consequence of adverse effect of human factor and improper forest management. To prevent the undesired processes it is recommended to conduct comprehensive research and to present scientifically justified reclamation ways.

In 2014-2017 three different herbicides, namely Uragan Forte (3 l/ha), Targa Super (1 l/ha) and Dialan Super (1 l/ha) were sequentially applied per years and crops against the weeds throughout the cultivation phases of winter wheatmaize-potato in conditions of Vosketap community of the Ararat plain.The biological efficiency of the mentioned herbicides has made 98 %, 100% and 100 %, while the yield surplus against the control variant has made 8.5, 51.0 and 82.0 c/ha respectively. Due to the relevant agrotechnical events and proper use of anti-weed preparations, as well as without crop rotation practice it is possible to sequentially cultivate different crops in the same field while minimizing the quantity of weed plants.

The results of genetic analysis on the coefficient of photosynthetic productivity (CPP) in seven varieties of Samsun tobacco are summed up in the fourth article of the series. It has been confirmed that in the hybrids of F₁ an intermediate inheritance of the trait prevails, which is mainly manifested by the impact of recessive additive genes leading to incompatibility in the indices of ĝ_i and the mentioned trait. The significance of CPP as a valuable photosynthetic index in the creation of hybrid combinations with an improved photosynthetic apparatus has been justified. In the result of the study, valuable varieties and perspective hybrids have been identified and specific recommendations on optimizing all breeding stages have been introduced.

According to investigations conducted in conditions of irrigated brown meadow soils of the community Vedi in the Ararat region, the application of barda with the dose of 1400 m³/ha promotes the crops growth and development. Due to its valuable macro-nutrients (N, P, K) the soil’s physicochemical, chemical properties and nutritional regime improves, as well as the crop’s yield capacity increases. In the result of fertilizing the experimental plots with barda, the yield capacity of watermelon has increased by 28.8 % and the grain yield of winter wheat – by 24 %.

In the technology of cottage cheese production the milk fat was completely substituted by milk and vegetable oil emulsion, which had been derived from skimmed milk and olive oil with the ratio of 50:50. The organoleptic, physicochemical and safety indices of the food product have been investigated. The produced cottage cheese can be used in the technology for functional food production due to the large content of useful unsaturated fatty acids, vitamins and antioxidants.

It is recommended to use the green tea infusion as a functional component and an improving agent to upgrade the baking technology. Upon the conducted research the efficiency of applying the mentioned tincture has been justified. The qualitative indices of the product have been determined through the methods regulated with generally accepted standards. According to the laboratory evaluations conducted for baking technologies the physicochemical and organoleptic properties of the finished bread products have improved upon the use of green tea infusion.

The aim of the study is to assess the non-carcinogenic risk of heavy metals (Cd, Cu) through fish consumption by the population of Yerevan. The method of K-means cluster analyses has been applied. The amount of the average daily intake of cadmium and copper detected in the fish samples of Sevan Trout, Sterlet and Sazan didn᾿t exceed the standards of International Health Regulation (IHR). Non-carcinogenic risks related to their effect haven’t been recorded. The results of cluster analyses can serve as a base for conducting general dietary investigations.

The use of feijoa and white glaze as a plant based supplement in the curd cheese production has been studied for the first time. According to the research results, the dairy product gets rich in easily digested carbohydrates, vitamins, essential amino acids, macro- and micro-nutrients and other nutritional elements due to the plant-based supplement. Skimmed milk has been used as a raw material, which is easily digested by human body.