Research in Agricultural Engineering, 2005 (vol. 51), issue 1
Density and shape characteristics of Agria tubers cultivated at different conditions
J. Blahovec
Res. Agr. Eng., 2005, 51(1):1-6 | DOI: 10.17221/4894-RAE 
Potato variety Agria was cultivated in different fertilising and/or irrigation regimes. Individual tuber dimension and the individual tuber density were studied two months after the harvest with aim to find some potential relation between tuber density and its shape. The stem-bud density gradient was also studied by determination the density of the stem, middle and bud parts of the individual tubers. The results of the measurements brought information on relatively variable parameters that slightly depended on the cultivation conditions.
The reed canary grass (Phalaris arundinacea L.) cultivated for energy utilization
Z. Strašil, V. Váňa, M. Káš
Res. Agr. Eng., 2005, 51(1):7-12 | DOI: 10.17221/4895-RAE
The reed canary grass as a source of energy was tested in field experiments on small plots at three different sites in 1996-2003. The effects of soil and weather conditions, different times of harvest (July, November, March) and different doses of nitrogen fertilization (0, 30, 60 kg/ha) on yields of phytomass were investigated. The effects of the harvest time on the water content in harvested phytomass, loss of phytomass in different harvest period and the content of basic nutrients and heavy metals in plants were all specified. The influence of the year, site and N fertilization on yields of phytomass of the reed canary grass was highly significant....
Relation between leaf area and dimensions of selected medicinal plants
C. Çirak, M. S. Odabaş, B. Sağlam, A. K. Ayan
Res. Agr. Eng., 2005, 51(1):13-19 | DOI: 10.17221/4896-RAE
In this research, leaf area prediction models were developed for some leaf-used medicinal plants namely Calamintha nepeta, Datura stromonium, Melissa officinalis, Mentha piperita, Nerium oleander, Origanum onites and Urtica dioica growing wild in Black Sea region of Turkey. Lamina width, length and leaf area were measured non-destructively to develop the models. The actual leaf areas of the plants were measured by PLACOM Digital Planimeter, and multiple regression analysis with Excel 7.0 computer package program was performed for the plants separately. The produced leaf area prediction models in the present study were formulized as...
New technique and technology of industrial splitting of stacked wood - log-splitter WS 800
J. Tajboš, T. Lukáč
Res. Agr. Eng., 2005, 51(1):20-27 | DOI: 10.17221/4897-RAE
Wood splitting, manual as well as mechanized one is a heavy work. It follows from the fact that usually the wood of the least quality, knot wood with scroll fibres, directed for less valuable assortments from the point of view of the price. Present technique on the contrary is relatively price demanding, requesting besides 2-4 members of operating personnel also adequate concentration of wood mass for the reason of the complete process economic efficiency. We submit in this paper technology analysis of the splitter WS 800 performance with the original concept for the wood manipulation and splitting process as well. Essential advantages of the mentioned...
Emission from energy herbs combustion
P. Hutla, P. Jevič, J. Mazancová, D. Plíštil
Res. Agr. Eng., 2005, 51(1):28-32 | DOI: 10.17221/4898-RAE
The energy herb and waste agricultural biomass create important potential of fossil fuels replacement for heating. At present is being used straw, other energy crops are energy sorrel, reed canary grass, knotweed and miscanthus. At biomass combustion are monitored CO and NOx emissions. For five types of fuels were measured the emission parameters during their combustion in boiler for straw of output 1 MW. The CO emissions are very different for individual fuels. The highest values were achieved for energy sorrel combustion.
Quality of the seed placing in seeding of sugar beet
J. Páltik, L. Nozdrovický, P. Findura, J. Maga
Res. Agr. Eng., 2005, 51(1):33-38 | DOI: 10.17221/4899-RAE
Evaluation of the quality of the sugar beet seeding in field condition is considered. Field experiments were conducted with the set of single seed drills (precision drills) in accordance with the international standard ISO 7256/1. The variability of plant spacing in the row and seeding depth were evaluated. The attention has been payed also to the soil condition and to properties of seeding material, which has been used. For the measuring of seeding depth the inductive and ultrasound sensor were used. According to the results obtained significant differences were observed among the precision drills, which were involved in field experiments. The variability...