Bird's-foot trefoil ensures the perennity of the meadows arranged vertically altitudinal and contributes to their sustainable use. For the establishment of sown meadows and oversowing of permanent grasslands, valuable Bird's-foot trefoil varieties are needed, adapted to the climatic conditions of the area and with high production potential. The present paper is part of such an approach and aims to evaluate a collection of 16 forms of Bird's-foot trefoil, representing a diverse range of agronomic types, in terms of morphological parameters regarding the production of seeds at the Bird's-foot trefoil and the yield of fresh fodder and dry matter. The research was conducted between 2020-2022 in the natural framework provided by the experimental field of ARDS Lovrin. The results of this study indicate that based on the functional relationships between morphological parameters, the 16 forms of Bird's-foot trefoil studied are divided into three large groups. For the production of the seeds, the forms of the Lv10, and Lv 15 Bird's-foot trefoil proved valuable, which showed a large number of generative shoots. In this regard, these forms of Bird's-foot trefoil can be tested alongside the Lv13 and LV8 genotypes. The highest yield was registered in the genotype Lv1 Bird's-foot trefoil, which achieved a fresh fodder yield of 19 t.ha-1 and a production of 4.39 t.ha-1 dry matter, highly above the average of the experiment. Value for selection shows six more genotypes of Bird's-foot trefoil that exceed the average of the experiment. This research is a basis for improving and selecting valuable, stable genotypes for future cultivation.
Monitoring and 3D modeling of an objective can only be done on the basis of high-precision topo-geodetic measurements, but also on the basis of UAV (drone) technologies, thus resulting in an overview of a certain study area. In this context, the present work aims to develop the creation of the 3D model of a grassland surface following a topographic survey by means of GNSS technology and specialized programs. This topographic survey was carried out with the Leica Viva GS07 GNSS equipment, an instrument that contains a wide range of applications. In this work, I used the Real Time Kinematic method to determine the points based on which I created the 3D model in AutoCAD using the TopoLT program. Because the data obtained is complex, in addition to 2D plans, we also have information that can be analyzed in 3D. For studies regarding the shape and the way of exploitation of the land, we created a digital model of the land which is the 3D digital representation of the respective surface. Based on the digital terrain model, we can easily visualize the relief of the grassland, in the present case the minimum altitude is 572.50 m, and the maximum altitude is 590.00 m, with a level difference of 17.5 m over the entire area. This digital terrain model can also be used to model water flow or other geomorphological processes that occur in the analyzed grassland (landslides, erosion, etc.). Multiple longitudinal or transversal profiles can be created over the entire surface to better observe the relief of the land.
The Italian ryegrass (Lolium multiflorum Lam.) provide a large amount of feed per surface unit due to its high productivity. Due to its wide use, a number of varieties are found on the market, the farmer being put in the situation to choose between those varieties that best meet the needs of his own farm. In this context, the paper aims to evaluate the production capacity at anthesis and the content of feed in protein and fiber in two vegetation phenophases in three varieties of Italian ryegrass. Three varieties were used as biological material; two tetraploids (Linos and Ivan) and one diploid variety (Sprint), grown under the conditions of Agricultural Research and Development Station Lovrin, Romania. According to the research, the tetraploid varieties Linos and Ivan are more productive than the diploid variety Sprint. The Linos variety behaved the best, which in the anthesis phenophase (BBCH65) recorded a production of 92 t.ha-1, with the feed containing 8.7 % protein and 36 % fiber. Regarding the protein and fiber content, the varieties analyzed are grouped according to the harvesting phase: BBCH49 and BBCH65. The highest content in the protein was found in the BBCH49 phenophase and decreased in the BBCH65 phenophase as the fiber content increased. These results can be useful for the farmer in making decisions on the choice of varieties of Lolium multiflorum Lam. and the harvest period.
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