Développement d'un système d'analyse d'images pour des tests en laboratoire de machines de semis

International audienceAim of this research is to develop an experimental apparatus to measure distances between seeds for precision sowing machines and to count number of seeds in a determined area for bulk drillers on a conveyor band by using image analyses techniques. System consists of a conveyor band, two cameras, a light, a computer, which includes an image acquisition board, an input board and a software to realise the desired measures using some image processing algorithms. Wheat, sunf lower, onion, and sugar beet seeds were used in this research. The results showed that there is no statistically significant differences between measurement of the image analyses system and human

The effect of moisture content on the thermal conductivities of some cereal grains

[Abstract Not Available

Effect of impeller materials on centrifugal pump characteristics

The purpose of this research was to reduce energy consumption by increasing the efficiency of centrifugal pumps with different impeller materials. The materials were cast iron, cast brass and cast iron coated with chemical polymer composite. Reducing surface roughness caused an increase in pump efficiency and a decrease in power requirement. The power requirement of the pump coated with polymer composite was 9.11 % less than that of the cast iron pump. Power requirement of the cast brass impeller was higher (1 %) than the cast iron pump for the open type pumps. Total head, pump efficiency and the flow rate of the cast brass impeller were higher than those of the cast iron impeller

Possibilities of direct drilling and reduced tillage in second crop silage corn

Reduced tillage techniques and direct seeding method that can replace the conventional methods, were examined in the western part of Turkey (Trakya Region) during the years of 1999 and 2000. In the experiment five tillage methods and no-tillage (DRD) were used. All tillage methods and direct seeding were applied in the dry soil conditions except conventional method. The tillage methods are heavy-duty disc harrow (DIS), plough (PLO), rotary tiller (ROT), tillage combination of tine, rotor and roller (TIC) and conventional tillage method in which plough is used in wet soil condition. The effects of the treatments on soil penetration resistance, mean emergence dates, percentage of emerged seedlings, plant height, stem diameter and silage corn yield were measured. All the parameters tested were found to be statistically significant. Direct seeding method gave the best result for mean of emergence dates (4.93 days) and percentage of emerged seedlings (95.48%). The best result for silage yield (69.32 Mg ha(-1)) was found in tillage combination. The lowest yield (58.92 Mg ha(-1)) was found in the heavy-duty disc harrow tillage method. Direct seeding gives the best results for tillage efficiency parameters, such as fuel consumption, effective power requirement and field efficiency. Reduced tillage and direct seeding methods can be used in second crop silage corn in the region. (c) 2005 Elsevier B.V. All rights reserved

Stray voltage problems in dairy farms and effects on animal behavior

Stray voltage is a small voltage measured between two points that can simultaneously be contacted bya cow. A current will flow between these points. The amount of current depends on the voltage and theresistance of the animal. Reactions of animals to mild electric shocks caused by stray voltage havebeen reported to include behavioral changes, changes in milking characteristics of dairy cows andchanges in production performance. This study evaluated the presence or absence of stray voltage ondairy farms. Questionnaires related to the history of the situation and animal reactions were also usedin the study. Experiments were carried out on 51 dairy farms in Turkey. All farms had more than 30milking cows which are milked by using pipe line milking systems. Stray voltage problems were foundon 12 farms (23%). The relationship between the presence of stray voltage and behavioral change onthe dairy farms was statistically significant (P=0,002). Based on the results, stray voltage sources onthe farms were mostly attributed to faulty wiring, faulty equipment and improper grounding