Shale gas well productivity potential evaluation based on data-driven methods: case study in the WY block

Evaluating the productivity potential of shale gas well before fracturing reformation is imperative due to the complex fracturing mechanism and high operation investment. However, conventional single-factor analysis method has been unable to meet the demand of productivity potential evaluation due to the numerous and intricate influencing factors. In this paper, a data-driven-based approach is proposed based on the data of 282 shale gas wells in WY block. LightGBM is used to conduct feature ranking, K-means is utilized to classify wells and evaluate gas productivity according to geological features and fracturing operating parameters, and production optimization is realized through random forest. The experimental results show that shale gas productivity potential is basically determined by geological condition for the total influence weights of geologic properties take the proportion of 0.64 and that of engineering attributes is 0.36. The difference between each category of well is more obvious when the cluster number of well is four. Meanwhile, those low production wells with good geological conditions but unreasonable fracturing schemes have the greatest optimization space. The model constructed in this paper can classify shale gas wells according to their productivity differences, help providing suggestions for engineers on productivity evaluation and the design of fracturing operating parameters of shale gas well.

Shelf Transport Pathways Adjacent to the East Australian Current Reveal Sources of Productivity for Coastal Reefs

The region where the East Australian Current (EAC) separates from the coast is dynamic and the shelf circulation is impacted by the interplay of the western boundary current and its eddy field with the coastal ocean. This interaction can drive upwelling, retention or export. Hence understanding the connection between offshore waters and the inner shelf is needed as it influences the productivity potential of valuable coastal rocky reefs. Near urban centres, artificial reefs enhance fishing opportunities in coastal waters, however these reefs are located without consideration of the productivity potential of adjacent waters. Here we identify three dominant modes of mesoscale circulation in the EAC separation region (~31.5−34.5°S); the ‘EAC mode’ which dominates the flow in the poleward direction, and two eddy modes, the ‘EAC eddy mode’ and the ‘Eddy dipole mode’, which are determined by the configuration of a cyclonic and anticyclonic eddy and the relationship with the separated EAC jet. We use a Lagrangian approach to reveal the transport pathways across the shelf to understand the impact of the mesoscale circulation modes and to explore the productivity potential of the coastal waters. We investigate the origin (position and depth) of the water that arrives at the inner-mid shelf over a 21-day period (the plankton productivity timescale). We show that the proportion of water that is upwelled from below the euphotic zone varies spatially, and with each mesoscale circulation mode. Additionally, shelf transport timescales and pathways are also impacted by the mesoscale circulation. The highest proportion of upwelling (70%) occurs upstream of 32.5°S, associated with the EAC jet separation, with vertical displacements of 70–120 m. From 33 to 33.5°S, water comes from offshore above the euphotic layer, and shelf transport timescales are longest. The region of highest retention over the inner shelf is immediately downstream of the EAC separation region. The position of the EAC jet and the location of the cyclonic eddy determines the variability in shelf-ocean interactions and the productivity of shelf waters. These results are useful for understanding productivity of temperate rocky reefs in general and specifically for fisheries enhancements along an increasingly urbanised coast.

Productivity of natural phytocenoses of the Namsky agrolandscape in Yakutia under organic and mineral nutrition regimes

The results of the study of the productivity potential of natural phytocenoses of different species composition in the Namsky agrolandscape of the middle taiga subzone of the Republic of Sakha (Yakutia) are presented. The research was conducted in 2009-2016. The soils of the experimental plot are permafrost soils with a thin humus layer. The effect of mineral and organic fertilizers on the productivity of steppe meadows was studied. On herb-grass, wheatgrass, steppificated phytocenoses the following practices of organo-mineral nutrition of plants were used: control (no fertilizer); humus 20 t/ha; humus 20 t/ha once every 4 years + N60P60K60 annually; N30P30K30 annually; humus 20 t/ha annually. The optimum rates of organic and mineral nutrients to improve the productivity potential of natural steppe meadows have been established. The highest productivity potential in the Namsky agrolandscape was obtained with the combined application of organic and mineral fertilizers (humus 20 t/ha once every 4 years + N60P60K60 annually). On herb-grass and wheatgrass phytocenoses hay yield reached 23.0-24.1 c/ha. Yield per 1 ha of metabolizable energy was 27.0-22.4 GJ, fodder units 1472-1663, crude protein 336-371 kg. The content of digestible protein in 1 fodder unit in herb-grass was 92 g, in wheatgrass - 102 g. The annual application of mineral fertilizers at a dose of 60 kg/ha of the active substance provided a 2-fold increase in the productivity of natural phytocenoses, depending on agroclimatic conditions of the growing season. The influence of mineral fertilizers and their joint application with organic fertilizers on the yield of natural phytocenoses is statistically reliable, which indicates the possibility of regulating the productivity of steppificated phytocenoses.

Influence of seed sowing rates on height, development and yield of the Russian varieties of oil-type sunflower in the Tashkent region of the Uzbekistan Republic

To obtain high yields of good quality of sunflower seeds, it is necessary to strictly observe scientifically justified cultivation technology, which combines techniques accounting both the biological features of the crop and the natural and climatic conditions of the region. But the role of varietal agricultural technology is also great, which takes into account the properties of a new variety and ensures the fullest realization of its productivity potential under these conditions. Research and development data are very important when introducing crops or varieties into new regions. In this regard, it became necessary to study and scientifically substantiate the optimal seed sowing rates of Russian sunflower varieties in irrigated conditions of the Uzbekistan Republic. The effect of seed sowing rates on the growth, development and yield of Russian oil sunflower varieties was studied in 2020– 2021 at the experimental station of the Tashkent State Agrarian University of Uzbekistan. The objects of the research were promising varieties Irtysh, Skormas (Russia) and the local variety Dilbar (Uzbekistan), which were cultivated at different seed sowing rates, providing a plant population of 40, 50, 60 and 70 thousand plants per ha. As a result of the studies, we found out, according to the complex of economically valuable traits, the best varieties of oil sunflower in the conditions of the Tashkent region are the middle maturing variety Dilbar of the local selection and the ultra-early maturing variety Skormas of the Russian selection, they formed the highest yield in the main crops on irrigation with a seed sowing rate of 50 thousand plant per ha – 4.35 and 4.09 t per ha, respectively. The Russian variety Irtysh is ultra-early maturing, the growing season is 86–88 days, it is less productive and can be considered as promising for repeated crops.

Productivity indicators and correlations between them in spring barley cultivars of Uman National University of Horticulture

The study of crop formation processes by constituent elements revealed the dependence of the parameters of the number of grains in the ear and the weight of barley grain at the same level of grain yield on the number of productive stems per unit area. It is established that the increase in the number of productive shoots per 1 m2 is accompanied by a significant decrease in the productivity potential of the ear in terms of the number of grains and the parameters of the mass of one grain. The correlation dependence of these yield elements on the stem density of barley is strong. In the studies of 2018–2021, the number of productive stems, plant height, productivity of one ear and weight of 1000 grains of spring barley varieties Daniele, Gezine, Beatrix, Soldo, 5/18, Fabiola, Sangria, Utah, 9/19, Mompi 19, Lyuba and Champush. Correlation holidays between these indicators were also established. The number of productive stems of spring barley varieties on average for 2018–2021 amounted to 0.87–1.39 pieces/1 plant. The average biotype ranged from 0.89 in 2018 to 1.47 in 2021. There was a medium and strong variation in the number of productive stems depending on genotypes. In most collection specimens, the rate varied greatly depending on growing conditions. Collectible samples 5/18 is a semi-dwarf, other biotypes are dwarfs. The highest plants were in 2020. The plant height of most cultivars varied slightly over the years of research. The average productivity of one ear of the analyzed collection samples was 0.63–1.17 g. The lowest indicators were noted in 2018, the highest – in 2020. The average weight of 1000 grains was 45.2–53.5 g with the highest indicator in 2021 g. The correlation between plant height and ear weight per ear was positive medium and close; between the number of productive stems and plant height – positive average, weak and negative average; between the number of productive stems and the mass of grain from the ear – a weak positive and negative correlation; between the number of productive stems and the mass of 1000 grains – the average positive and weak negative; between the height of the plants and the mass of 1000 grains and between the mass of grains from the ear and the mass of 1000 grains – from the average positive to the average negative.

Termelékenységnövekedés a COVID-19 járvány után : James Manyika-Michael Spence: A Better Boom. How to Capture the Pandemic’s Productivity Potential (Foreign Affairs, 2021, július/augusztus)

A COVID-19 világjárványt a jövőben minden bizonnyal a történelem nagy tragédiái között tartják majd számon. De ahogy más történelmi tragédiák, mint például a második világháború esetében, lehetnek közgazdászok, akik ezekben az eseményekben is felismerni vélnek rejtett lehetőségeket, amelyek hatásos kihasználásával – amennyire lehet – javítható a gazdaság teljesítménye, és így az emberi életminőség is.

Testing of domestic white cabbage hybrids at different planting densities

Четыре перспективных гибрида капусты белокочанной среднепозднего срока созревания селекции агрофирмы «Поиск» – F1Универс, F1 Застольный, F1 Поиск 2018 – и позднеспелый гибрид для хранения F1 Континент проходили испытание при разной густоте посадки: 19, 23, 27, 30, 33 тыс. растений/га в условиях Раменского района Московской области. Цель исследования: определить отзывчивость гибридов капусты белокочанной на густоту высадки для их выращивания в Нечерноземной зоне. Место исследований относится к лесной зоне в центральной части Русской равнины. Почвы – аллювиально-луговые среднесуглинистого механического состава. Погодные условия в годы проведения исследований были не совсем благоприятными для выращивания капусты белокочанной: в 2020 году отмечались осадки выше среднемноголетних значений, в 2021 году – жаркая засушливая погода, недостаток влаги, благоприятные условия для развития капустной моли и табачного трипса во время вегетации. Максимальной и стабильной урожайностью за два года исследований отличался среднепоздний гибрид F1 Застольный 144,54 т/га. Для получения наибольших сборов урожая продукции капусты белокочанной рекомендована высадка F1 Застольный при густоте 33 тыс. раст/га, для получения крупных кочанов на разреженных посадках 27 тыс. раст/га. F1 Поиск 2018 – при густоте 33 тыс. раст/га средняя урожайность составила 130,35 т/га, на разреженных посадках 141,4 т/га при густоте 23 тыс. раст/га. Гибрид F1 Универс реализовал свой биологический потенциал продуктивности 125,07 и 126,90 при 33 и 27 тыс. раст/га соответственно. Гибрид F1 Континент менее всех реагировал на изменение густоты посадки, имел наибольшую урожайность при 30 тыс. раст/га 120 т/га. Four promising F1 hybrids of white cabbage bred at Poisk company were tested at different planting density: 19, 23, 27, 30, 33 thousand plants/ha. in the Ramensky district of the Moscow region. F1 Univers, F1Zastolniy, F1 Poisk 2018 – mid-late ripening and F1Continent – late hybrid for storage. Objective of the study: to determine the responsiveness of white cabbage hybrids at different planting densities for their growing in the Non-Black Earth Zone. The research site belongs to the forest zone in the central part of the Russian Plain. Soils are alluvial meadows of medium loamy texture. The weather conditions during the years of the research were not entirely favorable for the cultivation of white cabbage. Precipitation above average annual values was observed in 2020. Hot dry weather, lack of moisture, favorable conditions for the development of cabbage moth and tobacco thrips during the growing season were in 2021. The mid-late hybrid F1 Zastolniy was distinguished by the maximum and stable yield over 2 years of research. Its yield was 144.54 t/ha. Planting F1Zastolniy was recommended at a density of 33 thousand plants/ha to maximize the yield of white cabbage production; large heads of cabbage should be obtained on sparse plantings at 27 thousand plants/ha. The average yield of F1Poisk 2018 was 130.35 t/ha with a density of 33 thousand plants/ha, 141.4 t/ha on sparse plantings with a density of 23 thousand plants/ha. The F1 Univers hybrid has realized its biological productivity potential of 125.07 and 126.90 at 33 and 27 thousand plants/ha, respectively. Hybrid F1 Continent reacted least of all to changes in planting density, had the highest yield at 30 thousand plants/ha 120 t/ha.

PENINGKATAN DAYA SAING USAHA PERKEBUNAN TEBU RAKYAT DI JAWA: TANTANGAN DARI PERSPEKTIF KEBIJAKAN / Improving the Competitiveness of Sugarcane Farming in Java: Challenges from Policy Perspectives

<p align="center">ABSTRAK</p><p align="center"> </p><p>Produksi gula dari usaha perkebunan tebu rakyat di Jawa hingga saat ini masih menjadi andalan produksi gula nasional, tetapi dalam lima tahun terakhir kontribusinya menurun sejalan dengan semakin menurunnya areal tebu. Kondisi ini menunjukkan bahwa daya saing usaha tebu rakyat semakin menurun yang diindikasikan oleh tingkat keuntungan yang terus menurun dan lebih rendah daripada usaha tani lainnya. Untuk meningkatkan daya saing usaha tebu rakyat diperlukan kebijakan pemerintah dalam rangka membantu memecahkan masalah atau mengatasi kendala-kendala, baik yang bersifat teknis maupun ekonomi. Tulisan ini bertujuan untuk mempelajari alternatif kebijakan teknis yang diperkirakan dapat membantu mengatasi kelangkaan sumber daya yang kemungkinan terjadi; serta mempelajari kemungkinan diperlukannya kebijakan pemberian insentif agar kebijakan teknis secara efektif dapat berjalan, melalui simulasi penetapan harga jual tebu dan gula. Alternatif kebijakan teknis yang bisa diterapkan untuk membantu mengatasi kelangkaan sumber daya yang terjadi pada sumber daya lahan, tenaga kerja, pupuk, benih tebu dan modal. Kelangkaan lahan mendorong terjadinya pergeseran budidaya tebu ke lahan kering, dengan potensi produktivitas lebih rendah, sehingga perlu pengembangan infrastruktur irigasi sederhana. Kelangkaan tenaga kerja terjadi berulang pada saat kegiatan puncak, sehingga perlu pola tanam tebu yang memungkinkan penerapan mekanisasi. Kelangkaan pupuk sering terjadi karena kegiatan pemupukan tebu bersamaan dengan usaha tani lainnya, sehingga perlu koordinasi antar lembaga terkait untuk menyediakan pupuk khusus untuk usaha tebu. Benih tebu bermutu sangat langka, sehingga perlu penyederhanaan peraturan penjenjangan kebun benih tebu, agar produksi benih dapat berjalan. Modal usaha tebu rakyat masih langka dan belum sepenuhnya dapat dipenuhi dengan penyaluran KUR Khusus Tebu, sehingga perlu kebijakan operasional untuk meningkatkan akses terhadap KUR. Selain itu masalah ketidakpastian harga tebu juga harus diatasi, melalui kebijakan penetapan harga jual tebu, yang sekaligus sebagai insentif bagi pekebun untuk meningkatkan produktivitas tebu.</p><p align="center">ABSTRACT</p><p align="center"> </p><p>Sugar production from smallholder farming in Java still has significant contribution to the national sugar production, however, in the last five years the contribution has decreased in line with the decreasing sugar cane area. This condition indicates that the competitiveness or profitability rate is decreasing and lower than other farmings. To improve the competitiveness, government policies are needed in order to assist in relaxing the constraints, both technical and economic constraints. This paper aims to study the technical policies that are expected to overcome the scarcity of resources that are likely to occur; as well as to study the possible incentive policies applied to support the technical policies, through simulations of the pricing of sugar cane and sugar. Alternative technical policies are applied to overcome resource scarcity in land resources, labor, fertilizer, sugar cane seeds and capital. Land scarcity has encouraged the shift of sugarcane cultivation to dry land, with lower productivity potential, so it needs the development of simple irrigation infrastructure. Labor scarcity occurs repeatedly during peak activities hence it is necessary to cultivate sugarcane patterns that allow the application of mechanization. Fertilizer scarcity often occurs because of sugarcane fertilization activities in concurrence with other farmings, so it is necessary to coordinate between related institutions to provide special fertilizer for sugar cane farms. Quality sugar cane seeds are very rare, so it is necessary to simplify the regulation of the classifications of sugarcane seeds, in order the seed production can run. The capital is still scarce and can not be fully fulfilled with the KUR (small scale credit program), so it needs operational policies to improve the access to KUR. In addition, the problem of sugarcane price uncertainty must also be addressed, through the policy of pricing of sugarcane, which also as an incentive for farmers to increase the productivity.</p>

Study on the Diversity of Products Obtained from Sheep in the Current Bioeconomy Context

A concern for the growth and utilization of sheep is raised since ancient times in Romania. The development of livestock sector is determined by the climate and the geographical configuration with the availability of grasslands maintained by transhumants. The pastoralism founded a domestic processing of milk, wool and leather products with positive socio-economic implications on material and spiritual life of local people. The sheep breeds prevailed until the 20th century were ‘Tucana’ and ‘Stogose’ and, to a lesser extent, ‘Tisigai’. These breeds, generally unimproved, have a profound fitness and resistance to harsh weather conditions. These breeds were also fit for traveling long routes in search of food. The utilization of a sheep breed is determined by the national economic demand, productivity potential of the breed, available, technology, improvement and utilization methods of the breed. The said sheep breeds were appreciated because they produce a diversity of products having superior nutritional or economic values. It is known especially for its white wool, which is used in domestic industry for making clothes and other products including artifacts, textiles, Persian carpets, etc. Considering the local natural conditions and the national economic demands, the sheep husbandry was assisted continuously to support intensive and multilateral development producing the necessary raw materials for the textile, fur, leather and food industry. Both research and the technical developments have contributed to the zootechnical field geared to resolve the problems appeared in the development of sheep. The scientific knowledge and expertise need to be combined with application skills leading to the development and modernization of complex technologies helping growth of sheep products.

Productivity potential of the Melba apple variety on rootstocks of different growth strengths

The article presents the results of a five-year study of the yield of the Melba apple variety on dwarf, semi-dwarf and medium-sized rootstocks selected by the North Caucasus Federal Scientific Center for Horticulture, Viticulture, and Winemaking (SKFNCSVV). The aim of the research is to study the influence of rootstocks of different growth strengths on the productivity potential of the Melba apple variety in the natural and climatic conditions of the Astrakhan region. The research revealed the influence of the rootstock genotype on the main productivity indicators: perishability, yield, frequency of fruiting, stability of productivity, marketable qualities of fruits. The early fruitfulness of the variety was most affected by the dwarf subspecies SK 3, SK 7 and semi-dwarf SK 2, on which 60–100% of the trees bloomed in the first year of growth in the garden. Among the studied combinations, the highest rates of crop growth in the Melba variety were noted on the dwarf rootstock SK 3 and semi-dwarf SK 2, in combination with which the variety was characterized by maximum values of average (19.4–16.3 t/ha) and total yield (97.2–81.6 t/ha), with the values of these indicators on the control variants 16.0–10.6 t/ha and 80.2–53.1 t/ha respectively. Low indicators of the periodicity index were noted on the dwarf rootstock SK 3 (15.6) and semi-dwarf rootstock: control M 26 (23.0), SK 2 (20.0), SK 5 (27.5), high index of productivity stability (0.75–0.86) – on rootstocks SK 3, SK 2 and SK 5. In the arid conditions of the Astrakhan region, the zoned variety Melba is recommended to be grown in an intensive garden on rootstocks SK 3 and SK 2, which ensure regular and stable yields.