№ 106(2), February, 2015
Public date: 28.02.2015
Archive of journal: Articles count 78, 173 kb
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RESEARCH METHODS OF SATURATED VAPOR PRESSURE AND EXPERIMENTAL INSTALLATIONS
Description
The static method is the most common, because it is applicable for measuring SVP of substances in wide ranges of temperatures and pressures. The essence of the method consists in measuring of vapor pressure in equilibrium with its liquid at a given temperature. Dynamic method is based on measurement of the boiling point of the liquid at a certain pressure. Saturation method of moving gas used in the case when the SVP does not exceed a few mm Hg. The method consists the following: the liquid is passed through the inert gas and saturated with vapor of liquids and then it flows into a cooler where the absorbed vapors are condensed. Knowing the amount of absorbed liquid and gas, as well as their molecular weight, allow us calculate saturated vapor pressure of the liquid. Knudsen effusion method is applicable for the measurement of very low pressures (up to 100 Pa). This method consists in researching of depending between the pressure and volume of saturated steam at a constant temperature. At the point of saturation an isotherm should have a break and turn into a straight line. Chromatographic method is based on complete chromatographic analysis of liquid and calculating the sum of partial pressures of all mixture components. Also, the article has a description of existing experimental installation for these researches and their advantages and disadvantages compared with each other
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Description
We have special demands to the planting of the tilled crops. Unlike grain crops, the tilled crops are sowed in a line with the certain step, which permits to provide the rational placing of the plants on the feeding areas. Due to this, the necessary conditions were made for their further growth and getting of big crops. For planting of the tilled crops all over the world people apply pneumatic precision drills with vacuum seed-sowing mechanisms and the quality of realization of the operation depends on their work greatly. The process of work of the vacuum seed-sowing mechanism can be divided on basic stage, the process of catching a single seed and carrying it out of the layer of the others with the drawing hole is the most responsible among them. The analyses of the work which has been done let conclude that the influence of the agitator on the layer of the seeds in the zone of their catching with the drawing holes increases the efficiency of this process. With an aim of the activation of the working process of the central agitator the authors offer to make its blades in such a way that their working sides would be turned in the direction of rotation of the agitator and the plane of the feed disk. All this let use the agitator not only for activation of the layer of seeds but for their push to the drawing holes of the feed disk. The proof of the offered construction is presented in the article, the results of the comparative experimental researches of the serial and the modernized vacuum seed-sowing mechanisms and the analyses of obtained data are shown, conclusions have been formulated
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06.00.00 Agricultural sciences
06.00.00 Agricultural sciences
Description
The purpose of the research is to assess the ability of reclamation plantations of walnut and black nut on the accumulation of heavy metals in their phytomass – leaves, shoots, and fruit. The studies were conducted in the Rostov region, the Krasnodar and the Stavropol regions. In the samples of vegetative aboveground and soil (under the canopy nuts) we have defined qualitative content of total forms of heavy metals of Cu, Ni, Co, Zn, Mn, Pb, Cd, Cr. This ability is the accumulation of heavy metals in leaves, shoots and fruit that fall from the atmosphere. Later, the bulk forms of these metals with the annual litter come to litter, and then – into the soil
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BIOLOGICAL FEATURES AND PRODUCTIVITY OF BLACK-AND-WHITE CATTLE
06.00.00 Agricultural sciences
Description
The behavior, interior and milk yield of the mature Black-and-White cows with various productivity levels, as well as etology of the replacement heifers are researched. The superiority of the high milk yielding cows for the lying duration and eating feed and water is revealed. Reduced variability of vital behavioral actions of animals is found. In addition, high yielding cows has been lower variability in all feeding acts. It was noted that high yielding animals exceeded equal age cows by the level of most interior factors. The differences were significant on the content of hemoglobin, vitamin E, and especially on the content of iron. Positive correlations between some interior design indicators is found. The analysis of lifetime productivity during our research found that high milk yielding cows had highest yields on the first lactation and kept the same level in the next lactations with insignificant variations. The lower productivity animals reached maximal yields on the third lactation with the followed downward trend. Differences between groups in lifetime productivity during research amounted to 16 992 kg. The significant superiority of the heifers with high grown intensity above equal age animals for the duration of feed and water eating, physiological functions and lying. The analysis of variation coefficient is confirmed the observed regularities.
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06.00.00 Agricultural sciences
Description
In the article, we have revealed the efficiency of foliar sulfur (potassium sulfate 250, 500, 1000 and 2000 g/ha), molybdenum (celik molybdenum 125, 250, 500 and 1000 ml/ha) and boron (solubor DF 0,5, 1,0, 2,0 and 4,0 kg/ha) fertilizers in various doses of soybean growing on the leached black soil of Northern Ciscaucasia which are based on studies in central part of the Krasnodar region in 2012-2014. The Vilan is a soybean variety most common in the Krasnodar region; therefore it was taken as the research object. It was established that 250 g/ha is the most effective dose of sulphur fertilizer. It’s provided a yield increase by 0,13 t/ha and increase collection of protein and oil (52,9 and 21.1 kg/ha, respectively). Soybean yields were increased by the application of molybdenum fertilizer in a dose of 250 ml/ha by 0,10 t/ha with increasing collection of protein 45,8 kg/ha. Boron fertilizer increased sum of beans and seeds. Variant of 0.5 kg/ha provided yield increase of 0.08 t/ha, but it was 0.26 t/ha in dry 2014
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IMPACT OF AN AMENDMENT FOR SOIL STRUCTURE IMPROVING ON SOIL AT SPRINKLING
06.00.00 Agricultural sciences
Description
The article presents the research results of the impact of amendment improving soil structure on soil upon sprinkler irrigation of agricultural lands. It is proposed to use artificial aggregation of soil for water erosion control via composition of structure-forming materials. The developed composition includes slagheap rock, bentonitic clay, claydite screenings, and shell limestone. Adjusted analytical relations of the impact of the amendment on runoff coefficient depending on the intensity of artificial rain upon irrigation of agricultural lands, slope, and water permeability have been revealed. Regression analysis of spectral surfaces has shown that slope of irrigation site has a significant impact on the increasing of runoff coefficient values, while correlation coefficient equals to 0.97. Water permeability has negative correlation, -0.85, with increasing the values of runoff coefficient. The relation between runoff coefficient and intensity of artificial rain is less strong, 0.89. We have determined that applying of the given amendment provides decreasing of runoff coefficient by 15 % depending on the slope of irrigation site, and by 20 % depending on rain intensity. Experts in the field of land reclamation can use obtained analytical relations for predicting surface soil loss when estimating the efficiency of amendment applying to control soil erosion activities at agricultural lands
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06.00.00 Agricultural sciences
Description
The study was conducted in a stationary multivariate experiment at the experimental station of Kuban State Agrarian University during eighteen years. The technology of growing winter wheat was improved by the optimization of norms of fertilizers and plant protection systems for different levels of soil fertility. Totally there were 48 technologies for growing winter wheat after and grain: corn, sunflower, sugar beet, where studied in the experiment. The best combination of high yield (77.2 t / ha) with high quality grain (nature - 789 g / l, the total vitreousness - 60%, -14.2% protein content, gluten content - 29.0%) was found under intense technology. The grain quality meets the requirements for the 2nd class. Similar productivity (yield - 76.4 t / ha, the total vitreousness - 55% protein content - 13.4% gluten content - 27.2%) was obtained in and when grown for its resource-saving technology also. All kinds of technologies for growing winter wheat studied in the experiment were profitable, but resource-saving technology was the most efficient. Net income per hectare under this technology was 31,745 rubles, and a cost of 1 quintal of grain - 284 rubles
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MODERN TRENDS IN DEVELOPMENT OF ORGANIC AGRICULTURAL PRODUCTION. GERMAN EXPERIENCE
06.00.00 Agricultural sciences
Description
The organic agriculture is an important issue for sustainable development and food quality production. For this reason we analyzed the data on land use in organic production and the volume of the market for organic products in Europe and Russia. The motivation of farmers and the driving factors for the transition to organic farming methods in developed countries and the role of subsidies have been shown. The analysis of the state of organic production in Germany has been carried out. In 2013, Germany reported 23484 organic farms, which represent 8.2% of agricultural production and the total cultivated area 1,045 Mio. ha. In organic production are involved 9 national associations with their own logos, integrated by 12250 farms (52.2%), and the remaining 11 234 biofarms (47.8%) use the EU-bio logo. Over the past years there has been observed a significant increase in organic livestock production; e.g. during 2007-2012 milk, poultry meat and eggs production were increased by 58.3, 60,6 and 108.7% respectively. Price of bio eggs in November 2014 was 55.6% higher than in free-range system and 100% higher than in floor housing system. Obviously, organic production is an efficient production system capable of ensuring the economic well-being of rural areas. For further expansion of this sector in Russia is necessary to develop the economic incentives, which encourage conversion from conventional, farming to organic production. Also, it is necessary to raise awareness of producers and consumers about the quality of organic products
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AGROCHEMISTRY OF HUMIC GROWTH REGULATORS IN RICE
06.00.00 Agricultural sciences
Description
The article shows prospects of the use of growth regulators on the nature of humic culture of rice in the first place due to the low field germination of seeds, rice crops lodging. Effect of humate on the growth, development and photosynthetic activity of plants, as well as the consumption of nitrogen, phosphorus and potassium results in increased grain yield of rice. Depending on the type of humate yield increased by 5,0-6,4 с/ha. Seed treatment caused a change humates biochemical and technological indicators of the quality of grain. Beans with these options contain more than in the control of protein per 0,13-0,44 % starch - 0,36-1,2 %, decreased membranous grain by 0,2 % and 1 % fracture, raised on vitreousness 1,46-2,0% and the yield of cereals on 1,06-2,0 %
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PRINCIPLES AND PRACTICES OF SEED SELECTION NOWADAYS
06.00.00 Agricultural sciences
Description
The article presents the author’s insight into the theoretical foundations of plant breeding for self-pollinators and cross-pollinators. From the author’s point of view, plant breeding techniques depend on a type of pollination, population propagation and isolation from other variety pollen. Adaptive properties of crops are described as ones depending on a genetic type (genetically pure lines, populations, hybrids, pure varieties and clones). The key role of seeds in preserving a plant variety, or a cultivar, is emphasized. In the article, cultivar and yield qualities of seeds are characterized. The reasons for seed deterioration and yield decrease have been looked into. Improvement of main crops such as wheat, barley, rye, rice, soybeans, maize, triticale, sunflowers, potatoes, sugar beets is characterized in detail. The author shares the traditional point of view on the seed breeding program. It includes following steps: development phase (breeder’s seed), maintenance phase (in which a quantity of seed is maintained under high standards) and the distribution phase (production of commercial seed for distribution to the public). The difference between primary and secondary seed selection is explained. The best periods for crop rotation and crop renovation are also described. The legally enforceable standards of quality and genetic purity for different crops are presented in the article. It is pointed out that it is vital to maintain high cultivar qualities after multiplication and distribution of the new variety. Only large-scale pedigree system for seed production promotes it
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