Research in Agricultural Engineering, 2006 (vol. 52), issue 1

ALT pedometer - a new sensor-aided measurement system for improvement in oestrus detection

U. Brehme, U. Stollberg, R. Holz, T. Schleusener

Res. Agr. Eng., 2006, 52(1):1-10 | DOI: 10.17221/4873-RAE  

Without sensor-aided animal data measuring systems far fewer oestrus cycles are recognized because cycle length, oestrus duration and oestrus intensity have developed negatively at high animal performance rates. This development makes it eminently clear that observation of the mating season in the dairy cattle sector is even more important than assumed so far if the financial losses due to insufficient herd fertility are not to become a business problem. Electronic identification and measuring systems represent key technologies for progressive automation in animal husbandry in modern, future-oriented livestock farming. Suitable objective measuring...

Impact of soil compaction in sowing on development and crops of sugar beet

V. Uhlíř, J. Mareček, J. Červinka

Res. Agr. Eng., 2006, 52(1):11-16 | DOI: 10.17221/4874-RAE  

Putting together work operations minimizes the number of machine passes across the plot, which helps to reduce negative soil compaction and to save fuels. However, the combination of working operations also reflects in the increased weight of machines, which - on the other hand - can result exactly in soil compaction. This is why the potential adverse phenomenon can be compensated by using tyres with a larger contact surface with the base. In the case of sowing root crops, some problems may appear with the application of these tyres as a certain part of the stand has been sown in their track. The paper brings an assessment of the possibility to use...

Mapping spatial variability of soil properties and yield by using geostatic method

M. Kroulík, M. Mimra, F. Kumhála, V. Prošek

Res. Agr. Eng., 2006, 52(1):17-24 | DOI: 10.17221/4875-RAE  

The Czech University of Agriculture in Prague (CUA) Farm at Lány started with precision farming technology several years ago. In the first step the yield and nutrients content were monitored. For precision application development, detailed description of soil conditions and interrelationship will be necessary. Pulling force and soil electric conductivity measurement as indirect measuring methods were used for mapping spatial soil variability. These methods demonstrate other ways for description of complex soil media.

Applicability of models based on deterministic chaos theory for forecasting of electricity sales in rural areas

M. Trojanowska

Res. Agr. Eng., 2006, 52(1):25-29 | DOI: 10.17221/4876-RAE  

The applicability of models based on deterministic chaos theory, in particular the self-similar fractal models, logistic models according to Prigogine, logistic models according to Schuster, and heuristic crossing models for one-year-ahead forecasting of the sales of electric energy in the rural areas, is verified in the paper. The model quality assessment was carried out based on the errors analysis of the 10-year ex post forecasts of the electric energy sale to rural consumers by three selected distribution companies. As the electric energy consumption were disturbed by economic crises, the forecasts were developed using not only annual sales value...

Evaluation of factors influencing adhesive bond strength

M. Müller, P. Hrabě, R. Chotěborský, D. Herák

Res. Agr. Eng., 2006, 52(1):30-37 | DOI: 10.17221/4877-RAE  

In the last ten years periods the bonding technology noted a great boom not only in manufacturing industry but in repairing industry, too. The expansion of chemical industry is the cause of this boom. In this way the use of bonding technology in industrial applications brings considerable cost savings. For the successful use of adhesives the knowledge of used adhesives and of further affecting factors is important. Respecting of this know-how is the presumption of the bonded joint successful design. The breaking of the technological procedure and the incorrect design are very often reasons of wrong joints. The paper contains theoretical in formation...