scholarly journals Intensifying agricultural crops production by means of thermal reclamation

2021 ◽  
Vol 280 ◽  
pp. 10006
Author(s):  
Oleg Pinchuk ◽  
Serhii Klimov ◽  
Ivan Romaniuk ◽  
Florin Faur ◽  
Maria Lazăr ◽  
...  
Keyword(s):  
Heat Exchangers ◽  
Crop Production ◽  
Sandy Loam ◽  
Vegetation Period ◽  
Soil Horizon ◽  
Coolant Temperature ◽  
Agricultural Crops ◽  
Soil Heating ◽  
Chernozem Soils ◽  
Crop Type

The use of surface heating with heat exchangers significantly affects the temperature regime of the soil and the surface air layer. It is manifested in a change in the distribution of temperatures according to the soil horizon, in a considerable increase in the temperature of the soil and air, in a change of heat exchange between the soil and the surface layer of air. When using tunnel greenhouse, heating the soil with the coolant temperature of 25…30 ºC contributes to the creation of all necessary conditions in ground area equipped with a heat exchangers for shifting the vegetation period of ultra-early cultivation of agricultural crops, on average, by 1-2 months depending on the crop type. This allows for earlier sowing and planting of thermophilic crops and getting harvest earlier than usual, as well as increasing the amount of crop production and improving its quality. The thermal efficiency of soil heating with water-filled flexible sleeves was studied experimentally in a field model experiment performed in the climatic terms of the Ukrainian Polissya on sandy loam and chernozem soils. Strawberry of the “Festivalny” type was used as the main crop-indicator. The influence of soil heating with heat exchangers on the growth, development and yield of strawberries has been studied.

scholarly journals Comparison of Soil Bacterial Communities from Juvenile Maize Plants of a Long-Term Monoculture and a Natural Grassland

Agronomy ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 341 ◽  
Author(s):  
Gergely Ujvári ◽  
Andrea K. Borsodi ◽  
Melinda Megyes ◽  
Márton Mucsi ◽  
Tibor Szili-Kovács ◽  
...  
Keyword(s):  
Microbial Communities ◽  
Bacterial Communities ◽  
Crop Production ◽  
Soil Depth ◽  
Vegetation Period ◽  
Taxonomic Diversity ◽  
Soil Horizon ◽  
Catabolic Activity ◽  
Natural Grassland

Nowadays, one of the most important challenges is to ensure sustainable agricultural management of crops such as maize (Zea mays L.). Long-term crop production, however, may influence the soil properties, the composition and activity of microbial communities. The aim of this study was to compare the catabolic activity and taxonomic diversity of bacterial communities inhabiting the soil of a non-fertilized maize monoculture and a natural grassland. Samples were taken from the horizons A and C in the first part of the vegetation period. MicroResp™ technique was used to explore the catabolic potential of microbial communities and next generation amplicon sequencing to reveal the bacterial diversity. Based on the catabolic activity results, higher differences were revealed among the soil horizons than the different land uses. The highest degree carbon source utilization was detected in the soil horizon A of the natural grassland. The taxonomic composition of bacterial communities was dominated by Proteobacteria. The relative abundance of other dominant phyla (Acidobacteria, Bacteroidetes, Verrucomicrobia, Actinobacteria, Planctomycetes, Gemmatimonadetes, Chloroflexi and Patescibacteria) varied according to both the land use and soil depth. Amplicon sequences belonging to genera of r-strategist “copiotrophic” and K-strategist “oligotrophic” bacteria were identified from the soils of both maize monoculture and grassland.

scholarly journals Effects on Crop Development, Yields and Chemical Composition of Celeriac (Apium graveolens L. var. rapaceum) Cultivated Underneath an Agrivoltaic System

Agronomy ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 733
Author(s):  
Axel Weselek ◽  
Andrea Bauerle ◽  
Sabine Zikeli ◽  
Iris Lewandowski ◽  
Petra Högy
Keyword(s):  
Aboveground Biomass ◽  
Root Biomass ◽  
Crop Production ◽  
Vegetation Period ◽  
Apium Graveolens ◽  
Land Productivity ◽  
Common Root ◽  
Crop Development ◽  
On Farm ◽  
Organically Managed

Agrivoltaic (AV) systems increase land productivity through the combined production of renewable energy and food. Although several studies have addressed their impact on crop production, many aspects remain unexplored. The objective of this study was to determine the effects of AV on the cultivation of celeriac, a common root vegetable in Central Europe. Celeriac was cultivated in 2017 and 2018 as part of an organically managed on-farm experiment, both underneath an AV system and in full-sun conditions. Under AV, photosynthetic active radiation was reduced by about 30%. Monitoring of crop development showed that in both years, plant height increased significantly under AV. Fresh bulb yield decreased by about 19% in 2017 and increased by about 12% in 2018 in AV, but the changes were not significant. Aboveground biomass increased in both years under AV, but only increased significantly in 2018. As aboveground biomass is a determinant of root biomass at harvest in root vegetables, bulb yields may be further increased by a prolonged vegetation period under AV. Compound analysis of celeriac bulbs did not show any clear effects from treatment. As harvestable yields were not significantly reduced, we concluded that celeriac can be considered a suitable crop for cultivation under AV.

Post-Soviet changes in irrigated crop production in the Amu Darya Basin

2021 ◽  
Author(s):  
Daniel Müller ◽  
Andrey Dara ◽  
Christopher Krause ◽  
Mayra Daniela Peña-Guerrero ◽  
Tillman Schmitz ◽  
...  
Keyword(s):  
Water Resources ◽  
Central Asia ◽  
Crop Production ◽  
Large Scale ◽  
Aral Sea ◽  
Crop Cultivation ◽  
Amu Darya ◽  
Crop Type ◽  
Water Scarce ◽  
Hydrological Droughts

<p>Water withdrawals for irrigated crop production constitute the largest global consumer of blue water resources. Monitoring the dynamics of irrigated crop cultivation allows to track changes in water consumption of irrigated cropping, which is particularly paramount in water-scarce arid and semi-arid areas. We analyzed changes in irrigated crop cultivation along with occurrence of hydrological droughts for the Amu Darya river basin of Central Asia (534,700 km<sup>2</sup>), once the largest tributary river to the Aral Sea before large-scale irrigation projects have grossly reduced the amount of water that reaches the river delta. We used annual and seasonal spectral-temporal metrics derived from Landsat time series to quantify the three predominant cropping practices in the region (first season, second season, double cropping) for every year between 1988 and 2020. We further derived unbiased area estimates for the cropping classes at the province level based on a stratified random sample (n=2,779). Our results reveal a small yet steady decrease in irrigated second season cultivation across the basin. Regionally, we observed a gradual move away from cotton monocropping in response to the policy changes that were instigated since the mid-1990s. We compared the observed cropping dynamics to the occurrence of hydrological droughts, i.e., periods with inadequate water resources for irrigation. We find that areas with higher drought risks rely more on irrigation of the second season crops. Overall, our analysis provides the first fine-scale, annual crop type maps for the irrigated areas in the Amu Darya basin. The results shed light on how institutional changes and hydroclimatic factors that affect land-use decision-making, and thus the dynamics of crop type composition, in the vast irrigated areas of Central Asia.</p>

EVALUATION OF THE EFFECTIVENESS OF THE DEVELOPMENT OF ORGANIC CROP PRODUCTION

2020 ◽  
Vol 10 (5) ◽  
pp. 749-763
Author(s):  
A.V. Shelenok ◽  
Keyword(s):  
Organic Farming ◽  
Organic Agriculture ◽  
Crop Production ◽  
Farming Systems ◽  
Developed Countries ◽  
Agricultural Crops ◽  
Advantages And Disadvantages ◽  
Slow Development ◽  
Organic Products ◽  
The World

The article examines intensive and organic technologies for growing agricultural crops, their impact on the environment, human health, indicates what are the advantages and disadvantages of organic agriculture. It is noted that with intensive technologies for growing agricultural crops, their yield increases, but if the doses of chemicals are not observed, soil fertility is disturbed, the environment is polluted. Devoid of the disadvantages inherent in intensive technologies, organic farming is significantly inferior in productivity to it, due to which it is not able to reach the same production volumes, to ensure a comparable level of domestic consumption, which is demonstrated by traditional farming. The article compares the effectiveness of traditional and organic agronomic farming systems. It is shown that in the case of comparability of yield indicators, traditional technologies at lower selling prices are more effective in terms of profit and profitability indicators. The reasons for the slow development of the organic segment in the agricultural production of Russia are revealed. In this regard, the topic of support for foreign and Russian agricultural producers, including organic products, as well as the underdevelopment of its domestic market is touched upon. It is noted that, in contrast to developed countries, Russia’s share in the world market for organic products is insignificant. Therefore, it is too early to talk about the prospects for the development of organic agriculture in Russia. In the world, organic farming is stimulated, it occupies its own niche, but in all respects it lags far behind the traditional method of growing agricultural products. Its share in the world food market ranges from 2.6 to 3%.

scholarly journals Development of Russian selection and seed production under the Federal scientific and technical program for agricultural development

2020 ◽  
Vol 164 ◽  
pp. 06014
Author(s):  
Lyudmila Nemenushchaya ◽  
Lyudmila Konovalenko ◽  
Tatiana Shchegolikhina
Keyword(s):  
Higher Education ◽  
Seed Production ◽  
Russian Federation ◽  
Crop Production ◽  
Agricultural Development ◽  
Higher Education Institutions ◽  
Agricultural Crops ◽  
Technical Program ◽  
The Russian Federation ◽  
Potential Customers

The paper analyzes the preparation and status of draft of subprograms of the Federal scientific and technical program for agricultural development for 2017-2025 (FSTP) on selection and seed production in crop production. The measures taken by the subjects of the Russian Federation for the purpose of implementing the FSTP subprograms, as well as a well-founded method for selecting potential customers for complex scientific and technical projects (CSTP), are presented. Recommendations have been prepared and suggestions have been made for selecting potential customers of the CSTP of FSTP. The analysis of the results of higher education institutions subordinated to the Ministry of Agriculture of Russia as potential participants of the CSTP in the field of selection and seed production of agricultural crops is given.

Transient Heat Transfer in a Vapor-Heated Heat Exchanger With Arbitrary Timewise-Variant Flow Perturbation

1964 ◽  
Vol 86 (2) ◽  
pp. 133-142 ◽  
Author(s):  
Wen-Jei Yang
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Heat Exchanger ◽  
Transfer Coefficient ◽  
Heat Exchangers ◽  
Amplitude Ratio ◽  
Perturbation Technique ◽  
Transient Heat Transfer ◽  
Coolant Temperature ◽  
Flow Perturbation

An analysis is made of transient heat transfer in a vapor-heated heat exchanger with an arbitrary timewise-variant flow perturbation. The heat-transfer coefficient between the tube and coolant is assumed to vary like the n power of the coolant velocity. Results are obtained through the use of the perturbation technique. General relations are presented in closed form and their application is illustrated by carrying out some typical examples: step, linear, exponential, and sinusoidal transients in the coolant flow velocity. The influence of the system parameters on the variation of the coolant temperature is investigated. A phenomenon of resonance in the amplitude-ratio and phase-shift is disclosed for the oscillating flow transient. This phenomenon is explained by analyzing the enthalpy change of the coolant particle in the heat exchanger. The results are also compared with the analyses that have assumed a constant heat-transfer coefficient. Heat exchangers to which these results apply include the double-pipe and shell- and-tube type heat exchangers.

Sorption of clopyralid, dicamba and MCPA by two soils with conventional and no-till management

1998 ◽  
Vol 78 (1) ◽  
pp. 181-186 ◽  
Author(s):  
C. Shang ◽  
M. A. Arshad
Keyword(s):  
Crop Production ◽  
Sandy Loam ◽  
Organic Matter Content ◽  
Conventional Tillage ◽  
Matter Content ◽  
Tillage Systems ◽  
Soil Matrix ◽  
Tillage Practices ◽  
Soil Systems ◽  
The Difference

Sorption is one of the key processes controlling the fate of agrochemicals in soil systems. The sorption of agrochemicals on a soil matrix can be affected by changes in chemical and physical properties caused by different tillage practices. Clopyralid (3,6-dichloro-2-pyridinecarboxylic acid), dicamba (3,6-dichloro-2-methoxybenzoic acid), and MCPA ((4-chloro-2-methylphenoxy)acetic acid), weakly acidic herbicides, are commonly used to control broadleaf weeds in crop production. The sorption of the three herbicides by surface soils (0–5 cm) from different tillage systems was studied by batch equilibrium. Of the herbicides used, MCPA was sorbed on soil in the greatest quantity, dicamba was the least sorbed, and the sorption was dependent on the pKa values of herbicides. In a sandy loam soil, more herbicide was sorbed under no-tillage (NT) than conventional tillage (CT). However, in a clay soil the difference in herbicide sorption between the two tillage systems was not consistent. The results can be explained in terms of changes in soil pH and organic matter content. The presence of clopyralid and MCPA lowered the sorption of dicamba, and MCPA was more effective than clopyralid in competing for sorption sites with dicamba. Key words: Herbicide sorption, clopyralid, dicamba, MCPA, tillage

REDUCTION OF SECONDARY TILLAGE IN MOULDBOARD-PLOUGHED SYSTEMS FOR SILAGE CORN AND SPRING CEREALS IN MEDIUM-TEXTURED SOILS

1990 ◽  
Vol 70 (1) ◽  
pp. 1-9 ◽  
Author(s):  
M. R. CARTER ◽  
R. P. WHITE ◽  
R. G. ANDREW
Keyword(s):  
Soil Properties ◽  
Crop Yield ◽  
Prince Edward Island ◽  
Crop Production ◽  
Sandy Loam ◽  
Soil Depth ◽  
Nutrient Content ◽  
Slight Reduction ◽  
Hordeum Vulgare L ◽  
Spring Cereals

Minimum tillage for soils that require regular cultivation consists of reducing the degree of secondary tillage and number of passes over the field. This study was conducted to determine whether one-pass mouldboard-ploughed systems were suitable for production of silage corn (Zea mays L.) and spring cereals (Hordeum vulgare L., Triticum aestivum L.) on loam to sandy loam soils (Humo-Ferric Podzol and Gray Luvisol) in the perhumid soil climate of Prince Edward Island. The effects of reduction in secondary tillage were gauged by characterizing crop yield and nutrient content, soil properties and structure, and relative economics. Plant growth, crop yield, and nutrient content were similar in all the mouldboard-ploughed systems. Soil chemical properties were not affected by reduction in secondary tillage, but the one-pass plough system did result in a macro-aggregate distribution with a greater proportion of large soil aggregates (9.5–16 mm) and a slight reduction in soil strength over the 10- to 25-cm soil depth. Macroporosity and soil density in the top 8 cm of soil were similar between tillage systems. Reducing both the degree of secondary tillage and number of tillage operations decreased both estimated cultivation costs and time of tillage per hectare by 26 and 39%, respectively. One-pass mouldboard-ploughed systems appear suitable for annual crop production on medium-textured soils under the soil environment of Prince Edward Island. Key words: One-pass tillage, soil properties, crop growth

Intercropping Valuable Hardwood Tree Species and Agricultural Crops in Southern Ontario

1991 ◽  
Vol 67 (3) ◽  
pp. 200-208 ◽  
Author(s):  
Andrew M. Gordon ◽  
Peter A. Williams
Keyword(s):  
Land Use ◽  
Crop Production ◽  
Agricultural Crops ◽  
Conventional Agriculture ◽  
Southern Ontario ◽  
Forestry Practices ◽  
Cash Crops ◽  
Hardwood Trees ◽  
Hardwood Tree ◽  
Equipment Size

Intercropping of hardwood trees with cash crops is an alternative to conventional agriculture and forestry practices that gives flexibility in goals and a potential for gradual changes in land use. Six intercropped plantings have been established in southern Ontario to investigate aspects of tree growth, crop production, and site relationships. This paper reports preliminary results from this research.Important considerations during establishment of an intercropped plantation include: equipment size, cropping methods, competition control and wildlife concerns. Plantings and spraying equipment have primary influence over plantation layout; and mice, groundhogs and deer can cause serious problems in some situations.

Impact of soil sterilization and irrigation intervals on P and K acquisition by mycorrhizal onion (Allium cepa)

Biologia ◽  
2009 ◽  
Vol 64 (3) ◽  
Author(s):  
Nasser Aliasgharzad ◽  
Saheb Bolandnazar ◽  
Mohammad Neyshabouri ◽  
Nader Chaparzadeh
Keyword(s):  
Allium Cepa ◽  
Crop Production ◽  
Root Colonization ◽  
Sandy Loam ◽  
Arbuscular Mycorrhizal ◽  
Field Capacity ◽  
Am Fungi ◽  
Irrigation Interval ◽  
Water Stress Condition ◽  
Mycorrhizal Plants

AbstractDrought is a world-spread problem seriously influencing crop production. Arbuscular mycorrhizal (AM) association and soil microorganisms can help plant growth under water stress condition by improvement of its nutrient and water uptake. In this experiment, onion plants (Allium cepa L. cv. Red Azar Shahr) were inoculated with three AM fungi species (Glomus versiforme, G. intraradices, G. etunicatum) or left un-inoculated as non-mycorrhizal plants, in a sterile or non-sterile sandy loam soil. Plants were irrigated at 7, 9 or 11-day intervals to keep the soil moisture content to field capacity at the irrigation time. Mycorrhizal root colonization decreased (p < 0.05) with an increase in irrigation interval, and the highest root colonization was achieved at 7-day irrigated onions in symbiosis with G. versiforme. Phosphorus content in plant tissue was significantly increased in mycorrhizal than non-mycorrhizal onions. Plants inoculated with G. versiforme at 9-day interval treatment had the highest leaf P content, while the lowest P was observed in non-mycorrhizal plants at all irrigation intervals. Onions inoculated by G. versiforme or G. etunicatum at 9-day irrigation interval had the highest K content. Results revealed that the inoculation of onion plant with G. versiforme or G. etunicatum and increasing irrigation interval up to 9 days, could improve P and K uptake.

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