المؤلفون: G. Hristova, P. Veleva

المصدر: Agricultural Science and Technology, Vol 14, Iss 2, Pp 69-74 (2022)

مصطلحات موضوعية: disking, soil tillage, wheat production technology, statistical analysis, Agriculture

الوصف: Abstract. The present research was conducted to investigate the influence of annual precipitation on the depth of soil tillage with a disc harrow and to monitor their effect on the productivity of wheat grown by conventional technology. The study is based on a perennial field experiment on chernozem soils in the land of the Chirpan region located in central Bulgaria. Annual precipitation data were taken from the local GeoScan Meteo station. Data on the depth of disking, applied twice or three times during the monitored years according to climatic conditions, were measured with a linear meter. A moderate correlation (r = 0.568; 0.356; 0.383) between the annual precipitation and the depth of disking during the three agricultural years was found. Four regression models (Linear, Inverse, Quadratic, and Compound) describing the relation between them have been developed. From the obtained models‘ coefficients of determination (R2 ) for the three examined years the Quadratic model best expresses the relation between the investigated parameters (R2 = 0.172; 0.216 и 0.186). Statistically significant differences between the average wheat yield in the first and third agricultural year, as well as between the second and third agricultural year were obtained. It was found (R2 = 0.362) that the depth of disking affects the productivity of wheat grown by conventional technology about 36.2%.

وصف الملف: electronic resource

العلاقة: https://agriscitech.eu/effect-of-the-depth-of-pre-sowingTest-tillage-on-the-yield-of-wheat-grown-by-conventional-technology/; https://doaj.org/toc/1313-8820Test; https://doaj.org/toc/1314-412XTest

الوصول الحر: https://doaj.org/article/7408dcc5d43f4056b8aaa5677fbf181bTest

المؤلفون: Hristova, G., Veleva, P.

المصدر: Agricultural Science and Technology. 14:69-74

مصطلحات موضوعية: soil tillage, statistical analysis, disking, General Medicine, wheat production technology

الوصف: The present research was conducted to investigate the influence of annual precipitation on the depth of soil tillage with a disc harrow and to monitor their effect on the productivity of wheat grown by conventional technology. The study is based on a perennial field experiment on chernozem soils in the land of the Chirpan region located in central Bulgaria. Annual precipitation data were taken from the local GeoScan Meteo station. Data on the depth of disking, applied twice or three times during the monitored years according to climatic conditions, were measured with a linear meter. A moderate correlation (r = 0.568; 0.356; 0.383) between the annual precipitation and the depth of disking during the three agricultural years was found. Four regression models (Linear, Inverse, Quadratic, and Compound) describing the relation between them have been developed. From the obtained models‘ coefficients of determination (R2 ) for the three examined years the Quadratic model best expresses the relation between the investigated parameters (R2 = 0.172; 0.216 и 0.186). Statistically significant differences between the average wheat yield in the first and third agricultural year, as well as between the second and third agricultural year were obtained. It was found (R2 = 0.362) that the depth of disking affects the productivity of wheat grown by conventional technology about 36.2%.

وصف الملف: application/pdf

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::73f58e82f59aedf05d0c2da4e5cafbb4Test
https://doi.org/10.15547/ast.2022.02.021Test

المؤلفون: P. Yankov, M. Nankova, M. Drumeva, D. Plamenov, B. Klochkov

المصدر: Agricultural Science and Technology, Vol 7, Iss 1, Pp 94-97 (2015)

مصطلحات موضوعية: species composition, density of weeds, wheat, soil tillage systems, Agriculture

الوصف: Abstract. The investigation was carried out in the trial field of Dobrudzha Agricultural Institute, General Toshevo on slightly leached chernozem soil type. For the purposes of this investigation, variants from a stationary field experiment initiated in 1987 and based on various soil tillage tools and operations were analyzed. The species composition and density of weeds were followed in a wheat crop grown after grain maize using the following soil tillage systems: plowing at 24 – 26 cm (for maize) – disking at 10 – 12 cm (for wheat); cutting at 24 – 26 cm (for maize) – cutting at 8 – 10 cm (for wheat); disking at 10 – 12 cm (for maize) – disking at 10 – 12 cm (for wheat); no-tillage (for maize) – no-tillage (for wheat).Weed infestation was read at the fourth rotation since the initiation of the trial. The observations were made in spring before treatment of the crop with herbicides. The soil tillage system had a significant effect on the species composition and density of weeds in the field with wheat grown after previous crop maize. The long-term alternation of plowing with disking in parallel with the usage of chemicals for weed control lead to lower weed infestation of the weed crop. The lower weed density after this soil tillage system was not related to changes in the species composition and the relative percent of the individual species in the total weed infestation. The long-term application in crop rotation of systems without turning of the soil layer and of minimal and no-tillage increased the amount of weeds. The reason is the greater variability of weed species which typically occur after shallow soil tillage.

وصف الملف: electronic resource

العلاقة: http://agriscitech.eu/wp-content/uploads/2015/03/015.pdfTest; https://doaj.org/toc/1313-8820Test; https://doaj.org/toc/1314-412XTest

الوصول الحر: https://doaj.org/article/04ccfe1224c64773b216179b6568fecaTest

المؤلفون: P. Yankov, M. Drumeva

المصدر: Agricultural Science and Technology, Vol 12, Iss 4, Pp 340-347 (2020)

مصطلحات موضوعية: treatment, direct sowing, lcsh:S, 04 agricultural and veterinary sciences, General Medicine, 010501 environmental sciences, Soil tillage, 01 natural sciences, ploughing, lcsh:Agriculture, Crop, herbicides, Agronomy, 040103 agronomy & agriculture, 0401 agriculture, forestry, and fisheries, Environmental science, Composition (visual arts), slightly leached chernozem, infestation, 0105 earth and related environmental sciences

الوصف: The study was carried out during 2014-2016 on slightly leached chernozem soil type. The species composition and density of weeds were studied in grain maize grown after previous crop wheat under the following main soil tillage types: ploughing at 24-26 cm, chisel plough at 24-26 cm and no-tillage (direct sowing). The additional tilths of the areas with ploughed and loosened soil included single disking in autumn and double pre-sowing harrowing in spring. A total herbicide was applied for control of the emerging weeds in the variant with direct sowing. The weed control was done according to the standard technology for growing of the crop in this region – treatment with herbicides at stage 3rd-5th leaf of the plants. Weed infestation was read in spring prior to the pre-sowing tillage, immediately before the vegetation treatment with herbicides, and after harvesting. The type of main soil tillage had a statistically significant effect on the species composition and the density of weeds in the grain maize crops grown after previous crop wheat. The use of ploughing, in parallel with the use of chemicals for weed control, decreased the weed infestation in the maize crops. The lower density of weeds under this main soil tillage type was related to changes in the composition and the relative percentage of the respective species in the total infestation. The use of tilths without turning the surface layer and no-tillage in the crop rotation, in spite of the application of herbicides, contributed to the increase of the amount of weeds. The reason for this was the higher variability of weed species typical for shallow tillage types.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5af65f2b31d569f8c6e3a86577a43e30Test
https://doi.org/10.15547/ast.2020.04.054Test

المؤلفون: P. Yankov, M. Drumeva

المصدر: Agricultural Science and Technology, Vol 9, Iss 2, Pp 124-128 (2017)

مصطلحات موضوعية: pre-sowing tillage, lcsh:Agriculture, Crop, Agronomy, Yield (wine), lcsh:S, wheat, Sowing, General Medicine, crop structure, Soil tillage, yield components, Mathematics

الوصف: The investigation was carried out in the trial field of Dobrudzha Agricultural Institute on slightly leached chernozem soil. In order to clarify the effect of some types of pre-sowing soil tillage for wheat on the crop structure and certain yield components, the following variants of a stationary field experiment were analyzed: double disking at depth 10-12 cm (check variant); ploughing at 14-16 cm + disking; no-tillage (direct sowing) – pre-sowing treatment of the area with total herbicides. Wheat was sown after previous crop grain maize and was fertilized with N P K . Wheat cultivar Enola was planted at norm 550 germinating 140 120 80 2 seeds/m . The number of emerging wheat plants was read using square sampling frames sized 50 cm x 50 cm. Using the same sampling frames, the tillering in autumn prior to the wintering of the crops was followed, and in spring – prior to booting stage. The number of productive tillers was also read using these sampling frames. To determine the length of spike, the number of grains in it, and their weight, 30 spikes from 8 replications of each variant were analyzed. The emerging of the wheat plants, under the conditions of slightly leached chernozem soil in Dobrudzha region, was more uniform after sowing following disking, and after direct sowing. The minimal pre-sowing tillage and no-tillage for wheat ensured better autumn development of the crop and the plants. In these variants, higher number of overwintering plants and productive tillers per unit area were registered. Spike length was the highest after ploughing as pre-sowing tillage. Significant variations in the number of grains per spike of the investigated variants were not found. Grain weight per spike was the lowest under direct sowing.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b8bed24fe80d5e4e2eb8c567993a7cfbTest
https://doi.org/10.15547/ast.2017.02.022Test