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    Optimization of the seed spacing uniformity performance of a precision seeder using spherical materials and response surface methodology
    (American Society of Agricultural and Biological Engineers, 2010) Yazgi A.; Degirmencioglu A.; Onal I.; Bayram E.
    The objective of this study was to optimize the seed spacing uniformity performance of a precision seeder using spherical materials and Response Surface Methodology (RSM) and to verify the optimum levels of the variables. The variables considered in the study included vacuum on seed plate, the diameter of seed holes and peripheral speed of the seed plate. Spherical materials made of plastic were used and experiments based on Central Composite Design (CCD), one of the designs in RSM were carried out in the laboratory. The data obtained were divided into three different groups in order to obtain the values of Multiple Index, Quality of Feed Index, Miss Index. Other performance indicators called root mean square deviation and CP3 were also calculated and evaluated in the study. Prediction functions mostly for quality of feed index in polynomial form allowed the calculation of the optimum level of each independent variable. Optimum levels of the variables obtained for each spherical material were tested and verified.
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    The performance of developed rotary tiller fitted with pneumatic seeder
    (2010) Cakmak B.; Aykas E.; Onal I.; Cakir E.
    The objective of this study was to evaluate the performance of new developed rotary tiller fitted with pneumatic seeder which can perform tillage and cereal seeding in one pass. The seeding performance of developed machine was examined at laboratory conditions then its performance was compared with conventional seeding machine in the field conditions. The developed machine performs the seeding by first tilling the soil with rotary tiller then placing the seeds with the help of seeding tubes over which soil is evenly distributed. And finally, the seeds are covered by tilled soil and straw. Developed machine enables the seeding by one pass in the field which will decrease the field traffic and prevent the hazardous effects of buried straw on the seeds. Thus, it provides lower energy inputs, increased work rates and timeliness. First the seeding uniformity of the developed machine was examined at laboratory conditions and then compared with conventional seeding machine in the field tests for forward speeds at 1, 1.5, and 2 ms-1 and slopes of the field at 5%-10% and 15%. According to the results, developed machine had similar seedling emergence rate with conventional (80 % and 82 %), while allowing reduced tillage for cereal seeding along with fuel saving when compared to conventional seeding system. Fuel consumption of the developed machine was 16.16 Lha-1 whereas this was 29.60 Lha-1 for conventional seeding system. Developed machine provided better fuel consumption with almost twice less specific power requirement while creating similar seeding conditions as conventional system. When we compare the developed machine with conventional seeding systems for plant emergence and yield parameters in the field, there was no statistical difference regarding plant emergence, shoots ratios, grain yield, stalk/grain ratio, and number of plants per 1 m2 area.