bluuebunny/crossref_metadata_2025_split huggingface dataset:
Effect of liquid organic fertilizer derived from moringa on growth of upland red rice lines crosses from SE Sulawesi
Authors: Nasira W , Adawiyah R , Muhidin  , Sadimantara G R , Yusuf D N 
Published: July 2021

Abstract
Upland rice is an important food crop in Indonesia, including in Southeast Sulawesi, and the productivity still low under the production potential. One of the causes of this low production is low soil fertility and limited nutrients for plants. One of the efforts is by providing liquid organic fertilizer derived from moringa. This study used a two-factor and arranged in a randomized block design (RBD). The first factor was organic fertilizer treatment from moringa, consisting of two levels, namely without treatment and 20 ml per liter. The second factor was the difference cultivars tested consisting of 4 cultivars, namely GS44-1, GS44-2, GS16-1, GS16-2, and Lipigo 4. The results showed that the treatment of liquid organic fertilizer made from moringa significantly effects on the on the plant height. number of leaves and number of tillers on upland red rice.
Application of coffee husk compost and EM4 on growth and yield of chili pepper (Capsicum Frutescens L.)
Authors: Adnan  , Basri A B , Azis Abdul , Idawanni  , Iswoyo H 
Published: July 2021

Abstract
This research is intended to comprehend the effect of using waste from coffee husk and EM4 concentration on the growth and yield of chili pepper plants with two factors and repeating 3 times. The research starts from October 2018 to January 2019 by using a factorial randomized block design (RBD), which consisted of two factors namely: The factor of coffee husk waste (K) consisting of 4 levels, while the factor of EM4 concentration consist 4 levels. The research results prove that the waste of coffee husk has a significant impact on the number of productive branches, the number of fruits per plant, and fruit weight per plot. It significantly affects plant height at 45 days after planting (DAP) and stems diameter at 45 days after planting (DAP). The best treatment of coffee husk compost is found in K3 treatment (30 ton/ha). The treatment of EM4 concentration has a good effect on the number of productive branches, the number of fruits per plant, and fruit weight per plot. The best EM4 concentration treatment is found in the B3 treatment (15 mL/L water). The interaction between the coffee husk waste and the EM4 concentration confirms a significant effect on fruit weight per plot. The finest interaction is found in the compost of coffee husk waste 30 ton/ha with a concentration of EM4 15 mL/L water.
Improvement on the quality of chilli (Capsicum annuum L.) seedlings through seed immersion in Supergib solution
Authors: Syaiful Syatrianty A. , Haring F , Syawlia R R , Padjung R , Mantja K , Farid M 
Published: July 2021

AbstractThis study aims to obtain the best supergib concentration and immersion ime that affect the growth of chili plant seeds. The study consisted of two stages, namely viability and vigor test of seeds which was carried out at the Laboratory of Plant Breeding and Seed Science, Department of Agronomy, Faculty of Agriculture, Hasanuddin University. The second stage is the chili plant nursery which is held at the Faculty of Agriculture, Hasanuddin University, Makassar. The study was conducted from December 2019 to February 2020. This study used a two-factor factorial randomized block design, with the concentration of supergib as the first factor consisted of 4 levels, namely 0 ppm, 10 ppm, 15 ppm and 20 ppm. The second factor was the length of soaking time which consisted of 3 levels, namely 6 hours, 9 hours, and 12 hours. The results show that the 10 ppm supergib concentration and 12 hours of soaking the seeds gave the best results at the growth rate of 19.35% and the supergib concentration of 15 ppm and the duration of soaking for 9 hours gave the best results on the primary root length of the sprouts (3.68 cm), plant height (11.77 cm) and the number of leaves (6.67). Soaking time for 6 hours resulted in the highest average germination capacity of 65%, and treatment for 9 hours of immersion resulted in the highest growth simultaneous value of 25.67%.
Response of three maize varieties (Zea mays L.) to different nitrogen dosages
Authors: Riadi M , Amin A R , Novianti F , Musa Y , Farid M , Dungga N E , Sahur A 
Published: July 2021

Abstract
The research was carried out at the Experimental Garden of the Cereal Research Institute, Bajeng District, Gowa Regency, South Sulawesi Province, which took place from September 2018 to January 2019. The research aimed to study the interaction between certain nitrogen doses and certain maize varieties and the presence of maize varieties, as well as nitrogen doses provide the highest growth and production. This research was conducted in the form of an experiment using a separate plot design. The nitrogen dose as the main plot consisting of 4 levels, namely urea 0 kg.ha−1, 100 kg.ha−1, 200 kg.ha−1, and 300 kg.ha−1, then three varieties of maize as subplots, namely Bima-19 variety as hybrid representative, Lamuru as composite representative, and Srikandi Kuning as synthetic representative. The results showed that the Bima-19 variety fertilized with urea 300 kg.ha−1 gave the highest seed yield per hectare (8.10 tons.ha−1), and the Srikandi Kuning variety produced the highest ear height (91.25 cm) compared to other varieties tested. Application of urea 300 kg.ha−1 resulted in the highest ear height (113.19 cm), the longest ear length (20.02 cm), and the highest number of seeds. 33.83 seeds). All parameters observed had very significant positive correlation values, except for the age of flowering of the females and the number of seed rows of cob−1 which were significantly positive.
Vegetative phase of pepper plants on the combination of compost and biochar with the addition of mycorrhiza
Authors: Harsani  , Ruslan  , Rahim Iradhatullah , Rasbawati  , Yusriadi  
Published: July 2021

Abstract
Plant growth is strongly influenced by the availability of nutrients in the soil. One factor that influences the availability of nutrients in the soil is the availability of soil organic matter. Soil nutrient content such as C-organic, available nutrients, and soil microorganism diversity are indicators of soil fertility. This research was arranged using a completely randomized design. Data were collected directly in the field and also observations in the laboratory. This study aimed to determine the response of pepper plant growth to the vegetative phase with the application of compost-biochar-mycorrhizae. This study indicates that the best response is shown in the combination application treatment of compost, biochar with mycorrhizal fungi.
Improvement of suboptimal soil productivity to growth and production of groundnut (Arachis hypogea L.)
Authors: Rachman L M , Hazra F , Baskoro D P T , Riskawati R , Putri S K 
Published: July 2021

Abstract
Increasing suboptimal soil productivity in agricultural land to increase food production needs to be encouraged. A proper land management design is necessary to overcome the various obstacles and problems faced to increase suboptimal soil productivity. The purpose of this research, which was conducted at ex rice field of suboptimal soil, was to improve suboptimal soil productivity for plantation peasants by developing soil management recommendations, mainly through a combination of inputs needed to optimize the growth and productivity of potato plants based on soil conditions. A combination of lime dosage and organic matter (Petroganic) dosage with basic fertilizer (urea, N-P-K, and dolomite) were applied by using a Randomized Completely Design (RCD) for 8 (eight) treatments with three replication. The results showed that P4, treatment with the highest lime dosage, and Petroganic produced the highest fresh groundnut pod. It can increase production as high as 89% as compared to control. All treatment combinations of lime and Petroganic increased fresh nut pod between 46% to 89% compared to control. The use of basic fertilizer only increases production by 32% as compared to control. To achieve higher fresh nut pod yield, watering or irrigation should be included in soil management.
Preface
Authors: Rozenberg Gennady S 
Published: July 2021

Abstract
The 7th Conference of the Environmental Problems of Large River Basins (EPLRB-7): Preface
Dear reader, I have the honor to bring to your kind attention a collection of proceedings of the International Scientific Conference “Environmental Problems of Large River Basins - 7”. Six previous conferences [1-5]1 were timed to coincide with anniversary dates in the history of the Institute - 10, 15, 20, etc. years from the date of its foundation. But time is moving faster and faster today. This made us hold the 7th Conference in the middle of the 5-year cycle and discuss the urgent environmental problems of the basins of large rivers (first and foremost, the Volga River, the largest river in Europe).
Phytodiversity of the Middle Volga region using FD SUR database
Authors: Aristova M A 
Published: July 2021

Abstract
The article illustrates FD SUR database, which contains information on the spatial distribution of vascular plant species in Samara and Ulyanovsk regions. The surveyed area is 90,900 km2. The initial data were obtained as a result of studies carried out for the period 2004-2020 by the staff of the Institute of Ecology of the Volga River Basin of the Russian Academy of Sciences and some literary sources. The database contains over 100,000 records for 1935 species from 127 families and 628 genera. We develop a number of areas of flora research using the informational basis of FD SUR. We propose criteria for assessing the sustainability (natural addition) of floras based on the spectrum of family diversity indices. We studied the dependence of the taxonomic parameters of the flora on the number of species on floristic site and determined the values of these parameters for a number of territories of Samara-Ulyanovsk Volga region. We examined the dependence of the species and biomorphological composition of floras on the climatic conditions of the territory: the amount of precipitation and temperatures.
Shrub communities dominated by Caragana frutex in the Zhiguli Mountains
Authors: Bondareva V V 
Published: July 2021

Abstract
According to the literature we provide geobotanical analysis of plant communities with the steppe shrubs: Caragana frutex, Cerasus fruticosa, Cotoneaster laxiflorus, Chamaecytisus ruthenicus, Spiraea crenata, Euonymus verrucosus, Amygdlalus nana. The shrub communities occupy the settled areas of the southern slopes of the Zhiguli Mountains (Mogutova, Strel’naya, Bakhilova, Malinovaya, Nablyudatel’). Datasets of relevés were analyzed using the JUICE software package. The cluster analysis was performed using the PC-ORD 5.0 software package. The assessment of the relationship between the ecological characteristics of plant communities and environmental factors was carried out using the L G Ramensky’s indicator values, the IBIS program. DCA-ordination of relevés is performed using the “Ordijuice” module built into the JUICE program from the R package. The studied phytocenoses are divided into three groups. The ecological-phytocenotic and floral characteristics of each cluster are given. Diagnostic, constant and dominant species are established. The list of vascular plant species listed in the federal and regional Red Books, registered in phytocenoses, is given. The results of DCA-ordination of three clusters of shrub communities with a predominance of Caragana frutex are presented. A reliable correlation between the positions of these groups in the space of the DCA-axes and the L G Ramensky’s indicators values (moisture, soil fertility and salinity, pasture digression) was established. Species composition and characteristics of ecotopes in clusters is different. Further study of this shrub communities will reveal the syntaxonomic status.
Spatial distribution of planktonic ciliates in autumn at the Priplotinny Reach of the Kuibyshev Reservoir, the Volga River, Russia
Authors: Bykova S V 
Published: July 2021

Abstract
Spatial distribution of planktonic ciliates at the Priplotinny Reach of the Kuibyshev Reservoir (The Volga River, Russia), including the Usinsky Bay, was studied in detail at a vast station grid in the early-autumn period. The species diversity, species richness, abundance, biomass, and production of ciliates at the Priplotinny Reach were quite low, in contrast to those at the Usinsky Bay. At the Priplotinny Reach, the number of species per sample ranged as 3-23 species, abundance, as 18-356 cells L−1, and biomass, as 0.13-17.94 μg L−1. In the Usinsky Bay, these parameters were 17-38 species, 360-2284 cells L−1, and 5.2-61.4 μg L−1, respectively. Despite relative homogeneity of the hydrophysical conditions at the reach, a high variability in the quantitative characteristics of ciliate community was observed, probably due to local hydrological conditions. On the one hand, the peaks in the ciliates abundance coincided with the period of decrease of the water inflow, i.e., they were associated with the operating mode of hydroelectric power station, and on the other hand, they were caused by the direct influence of water masses of a large tributary. The structural organization of the ciliate community, in contrast to the general quantitative characteristics, was determined by local environment. An increasing role of bacteriovorous and histophagous ciliates was recorded in that areas characterized by high level of organic matter, particularly, in the area of conditional wastewater discharge, bridge construction, and tributary confluence. In general, the distribution of plankton ciliates at the Priplotinny Reach of the Kuibyshev Reservoir was largely influenced by the Usa River, which affected the redistribution of quantitative characteristics of the ciliate communities between the deep-water and shallow-water zones of the reach.
Spatial Distribution of COVID-19 Under the Influence of Environmental Factors: Correlation and Regression Analysis
Authors: Kostina N V , Kuznetsova R S , Rozenberg G S 
Published: July 2021

Abstract
Close monitoring of morbidity and mortality from COVID-19 has become a “supplier” of large amounts of spatially distributed information. This, in turn, has led to the creation of many models for the development of a pandemic. We used official information on the incidence and mortality of COVID-19 for 24 regions (oblasts and republics) of the Volga basin of the Russian Federation. We performed multiple regression analysis to test the significance of the impact of 19 social, economic and environmental indicators. 10 parameters turned out to be statistically significant for the number of cases, among which social indicators make a significant contribution (63.19%). For the indicator “mortality from COVID-19”, we identified 15 statistically significant factors. At the same time, we note the prevalence of socio-economic parameters (58.4%) over the environmental ones (31.2%). Among the analyzed 19 indicators, there were no such indicators with the help of which it is possible to quickly influence the incidence and mortality from COVID-19. Vaccination of the population is still a topical remedy. Nevertheless, we consider the very approach to the study of spatially distributed information to be successful. By combining the efforts of infectious disease specialists, systemologists, ecologists and other specialists, one can hope to create a workable (predictive and manageable) model for the development of COVID-19.
Biodiversity of Birch Forests in Mariy Chodra National Park
Authors: Osmanova G O , Firulina I I , Rozenberg A G 
Published: July 2021

Abstract
In recent decades, the interest of scientists and the entire world community in the problems of studying and preserving biological diversity has increased. Fundamental knowledge about the flora and fauna of specific areas, especially protected natural areas, should become the basis for the rational use of biological diversity as a potential for their socio-economic development. The aim of this research is to characterize the typological, taxonomic and structural diversity of birch forests in Mariy Chodra National Park, the Republic of Mari El. In this paper, the authors carried out a comprehensive study of the birch forests of Mariy Chodra National Park, where such study has not been carried out before. The classification of birch forests is fraught with significant difficulties, since their overwhelming majority occurred by changing the most diverse associations of spruce, pine, and partly oak plantations. Moreover, the birch forests themselves represent only a certain stage of forest development. In natural environment, birch forests play a vital part in the restoration of pine and spruce plantations. One can combine the associations of birch plantations into the following groups: green moss birch forests, long moss birch forests, sphagnum birch forests, herbaceous birch forests, grassy marsh birch forests, complex birch forests. Of these associations, the most common are birch forests: with spruce undergrowth, linden and spruce-linden. Other associations occupy small areas and are found mainly in the zone of significant development of oak forest elements. In this paper, the authors analyzed for the first time the biodiversity of birch forests of Mariy Chodra National Park in The Mari El Republic. The authors identified 14 types of birch forests in rather contrasting habitat conditions. The assessment of ecological conditions also showed that the studied communities are in rather contrasting habitat conditions, which made it possible to more fully assess the diversity of the analyzed territory.
Ecological aspects of the formation of the helminth fauna of Perca fluviatilis (Actinopterygii: Perciformes) of the Usinsky Bay (Kuibyshev Reservoir, Russia)
Authors: Rubanova M V , Mukhortova O V 
Published: July 2021

AbstractThe fauna of the multicellular parasites of European perchPerca fluviatilis(Peciformes) of the Usinsky Bay of the Kuibyshev Reservoir was studied in 2019–2020; nine taxa of helminths were found. The parasite prevalence of most of the intestinal helminth species, associated with the zooplankton community, did not exceed 12–25%. In the fish with a body length of 117–200 mm, fish juveniles and benthos organisms played a significant role in the parasite transmission. The Usinsky Bay was a buffer zone at the margin of the “river-reservoir” system and had a specific hydrological regime. This promoted favorable conditions for the spreading of alien species of aquatic organisms in the ecosystem of the reservoir; in some cases this led to an increase in the invasion of indigenous fish (European perch) by invader parasites. As a result of this process, the invasive species of trematodeApophallus muehlingibecame dominant in the helminth fauna of the European perch. High degree of infestation of European perch by this parasite indicated wide distribution of its first intermediate host, the alien molluskLithoglyphus naticoides, in the Usinsky Bay. Other species of parasites, associated with this invader, were not found inPerca fluviatilis. Helminths of the European perch can be used as biological markers to identify migratory activity, the vector of the invasion of some alien species, the range of their hosts, the population abundance, and indirect infection by alien hosts in different water bodies of the Volga River basin.
Synthesis of new environmentally friendly thermoplastic polymers based on isoprene
Authors: Sablina N A , Ulyanova D M 
Published: July 2021

Abstract
A significant part of the roofing sealing materials produced in the industry contains organic solvents. The use of such roofing materials causes significant harm to the environment and human health. In this study, new thermoplastic isoprene polymers with a softening point temperature in the range from 80 to 120°C have been synthesized, which make it possible to manufacture roll roofing materials used in practice without solvents. The process of production of polymers is based on the cationic polymerization of isoprene using catalytic system ethylaluminum sesquichloride-tert-butyl chloride. Varying the polymerization conditions allows one to control the molecular characteristics and softening point temperature of the polymers. A pilot batch of rolled roofing material was produced on the basis of the obtained polymer. As a result of the tests, it was shown that for a number of physical and mechanical parameters, the pilot batch of roofing material surpasses the known compositions using aliphatic hydrocarbon resins of the trade mark “Hikorez”.
Dependence of diversity of floras on climate in the Middle Volga region
Authors: Sharaya L S , Ivanova A V , Aristova M A , Kuznetsova R S , Kostina N V , Rozenberg G S 
Published: July 2021

Abstract
Links with climate of richness of species (Ns), genera (Ng) and families (Nf) for 28 polygons each 400 km2 in Middle Volga were studied. Negative correlations with temperatures T and positive with precipitation P of the warm period were revealed, and T and P most strongly affected diversity. Closest links with climate were for Nf, and the least for Ns. We estimated gradients of T and P in four geographic directions. The most pronounced are northern cold-humid and southeastern thermo-arid trends. The northern trend is characterized by a decrease in T by 0.34°C and an increase in P by 17 mm per 100 km; southeast- with an increase in T by 0.27°C and a decrease in P by 15 mm. The cold-humid trend provides the most favorable conditions for the growth of diversity in the region. In it, Ns increased by 36, Ng-by 17, Nf-by 6 per 100 km. For floras with highest Nf and Ng, closer links with T, P and directions are revealed; in contrast to Ns. This indicates the ecological plasticity of the diversity, with different responses to climate variations for different taxonomic levels, which contribute to the preservation of diversity in a heterogeneous climate.
Ecological trends of spatial distribution and of size-morphological structure of bacteriobenthos in the Kuibyshev Reservoir, the Volga River, Russia
Authors: Sherysheva N G 
Published: July 2021

Abstract
The abundance and biomass of bacteriobenthos, as well as morphological and size structure of bacteriobenthos community have been studied in 2016 in the Kuibyshev Reservoir. Three areas of the reservoir, differing by the features of the spatial distribution of bacteriobenthos, were defined: the downstream area of lake-like reaches, the mixed area of the Volga and Kama rivers confluence, and the upstream area of variable backwater. Trends in the increase in the number and biomass of bacteria along the longitudinal axis from the upstream reaches to the dam were revealed in the downstream area of lake-like reaches and in the upstream area of variable backwater. The mixed area of the Volga and Kama rivers confluence was characterized by a patchy distribution of bacteriobenthos. The abundance of bacteria in the bottom sediments was 3.6-10.5 × 109 cells mL−1, biomass, 263-971 μg mL−1. There was an increase in the abundance and biomass of bacteria in the area of the Volga and Kama rivers confluence. In the morphological structure of bacteriobenthos, the main morphological group were bacilli, followed in importance by coccobacilli. The predominant size classes of bacteria were 0.2-0.5 μm, 0.5-1.0 μm, and 1.0-2.0 μm. A number of reliable correlations were obtained between the characteristics of bacteriobenthos and the grain-size composition of sediments, organic matter content, and humus content. The share of aleurite fraction, organic matter content, and humus content affect the trends in the spatial distribution of quantitative indicators of bacteria. Main morphological and size groups of bacteria were significantly related to certain size fractions of the mechanical composition of bottom sediments, which affects the spatial distribution of these groups along the bottom of the reservoir.