Research in Agricultural Engineering, 2005 (vol. 51), issue 4
Possibility of reduction of ammonia emissions from manure storage piles
M. Zemek, J. Mareček
Res. Agr. Eng., 2005, 51(4):105-111 | DOI: 10.17221/4911-RAE 
According to the Gothenburg Protocol to abate acidification, eutrophication and ground-level ozone ammonia emissions need to be reduced by 40% in manure storage systems. An abatement of ammonia emissions, suggested in this paper, is based on application of the biotechnological agent Amalgerol. Ammonia emissions from farmyard manure storage piles from broiler and pig breeding were compared in order to verify the reducing potential of the applied biotechnological agent. The experiments carried out under operating conditions proved a positive influence of biotechnological agents on ammonia emissions reduction - decrease in the emissions from the broiler...
The comparison of two types sensors for ammonia emission continual measurement
J. Pecen, P. Zabloudilová
Res. Agr. Eng., 2005, 51(4):112-118 | DOI: 10.17221/4912-RAE
Measurement of the ammonia emissions by two different types of sensors (PHOTO ACOUSTICS analyzer INNOVA and SOLID STATE sensor SP-53) was carried out in laboratory with one material of litter, wood-shavings (with dry or wet material). The initial ammonia concentration and humidity of material were changed. The output data of these sensors were continually saved a processed. A small difference was found out between the output data of these sensors. The difference depends not only on ammonia concentration and humidity of material but also on the duration time from the beginning of measurement. All experiments of ammonia concentration were carried out...
Operational effects of implements on crop residues in soil tillage operations
J. Hůla, R. Šindelář, P. Kovaříček
Res. Agr. Eng., 2005, 51(4):119-124 | DOI: 10.17221/4913-RAE
After spring barley harvest the operational effects of tillers and seed drill on spring barley residues were evaluated in two variants of cultural operations. Generally low values of soil surface coverage by crop residues after cultural operations were performed document that soil tillage and sowing did not comply with the criteria for conservation technologies - the coverage of soil surface by crop residues was lower by 30% after all cultural operations. After silage maize harvest we determined the weight of maize crop residues and coverage of soil surface by these residues after shallow tillage by a disk tiller when nine variants of the operating...
The possibilities of droplet spectrum regulation at application of plant protection products
P. Harašta
Res. Agr. Eng., 2005, 51(4):125-133 | DOI: 10.17221/4914-RAE
Verification of the possibilities of a droplet spectrum regulation due to the change of working pressure, as well as the change of the size of the discharge orifice of a nozzle, was undertaken in laboratory conditions by measurement of the size of a droplet spectrum of the applied liquid. Selected types of low drift nozzles - Albuz AVI 025, Lechler ID 120, Lechler IDK 120-05, Lechler IDN 120-025, TurboDrop 03, Hardi INJET 02, Hardi B JET 02, Hardi LD 02and a flat fan nozzle Hardi ISO F 02-110 - underwent the measurement. The measurement of droplet spectrum was carried out at the nozzle's working height of 500 mm, and at working pressures of 0.1, 0.2,...
The effect of the land shape on the energy intensity of operation steps
L. Jílek, V. Podpěra
Res. Agr. Eng., 2005, 51(4):134-139 | DOI: 10.17221/4915-RAE
The goal of the work is to find and describe the effect of the shape and size of the land on the energy intensity of an agricultural operation. This effect is expressed by means of coefficient KS that is determined by a theoretical calculation; the correctness of the algorithm is confirmed by coefficient KSP determined by a field-laboratory measurement. Both coefficients are determined for seven different lands and the results are compared mutually. The results are also indicated for the calculation of fuel consumption and machine performance with respect to the land size and shape. With the help of these relations,...
Measurement of pressure in hydraulics system of the ZTS 160 45 tractor
Z. Tkáč, J. Jablonický, R. Abrahám, J. Klusa
Res. Agr. Eng., 2005, 51(4):140-144 | DOI: 10.17221/4916-RAE
This contribution is oriented on the field of dynamic loading analysis of three-point hitch of tractor hydraulic pump. The hydraulic pump is placed in circuit of three-point hitch of the tractor ZTS 160 45. Obtained data from operation experiments will be applied for simulation of dynamic loading of the tested hydraulic pump. The measurements were realized during position control with ploughing sets: tractor ZTS 160 45 + plough 5-PN-30 and tractor ZTS 160 45 + plough 7-PHX-35. During the test physical and mechanical properties of soil and operating parameters of ploughing sets were investigated. Pressures of hydraulic system were in range from 3.2...
Bonded wooden balks
D. Herák, R. Chotěborský, M. Müller, P. Hrabě
Res. Agr. Eng., 2005, 51(4):145-151 | DOI: 10.17221/4917-RAE
The paper describes the basic type models of wooden balk structures, their use and typical dimensions of balks. Further the calculation of bonded wooden balks is described. The paper also contains the summary of basic type models with bonded wooden balks. Finally the orientation values for the design of construction elements are described.