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  • Küçük Resim Yok
    Öğe
    Development of a computerized measurement system for in-row seed spacing accuracy [Si{dotless}ra Üzeri Tohum Dagi{dotless}li{dotless}m Düzgünlügü İçin Bilgisayar Destekli Ölçme Sistemi Geliştirilmesi]
    (Turkiye Klinikleri Journal of Medical Sciences, 2009) Önal O.; Önal I.
    The aim of this study was to develop a computerized measurement system (CMS) combined with a sticky belt test stand for examining in-row seed spacing distribution accuracy. For this purpose 8 performance parameters were selected for precision seeding: mean seed spacing, the standard deviation, the multiples index, the miss index, the quality of feed index, the precision, the population index, and the coefficient of precision (CP-3). The CMS hardware consisted of a high precision optical mouse coupled with a laser pointer and a notebook computer. The use of optical laser technology is a new method for the determination of seed spacing distribution. The CMS stored seed coordinate data, which was input using a simple user interface, and sent to the data to Microsoft Excel for further statistical analysis. The results obtained from this study confirm that the combination of a sticky belt test stand and CMS can be used instead of a digital caliper and steel tape measure to rapidly and correctly obtain quantitative evaluations of seed spacing uniformity in the laboratory. © TÜBİTAK.
  • Küçük Resim Yok
    Öğe
    An evaluation of seed spacing accuracy of a vacuum type precision metering unit based on theoretical considerations and experiments [Teorik ve deneysel verilere dayali{dotless} olarak vakumlu tek dane ekim ünitesinin tohum arali{dotless}gi{dotless} düzgünlügünün degerlendirilmesi]
    (Turkiye Klinikleri Journal of Medical Sciences, 2012) Önal I.; Degirmencioglu A.; Yazgi A.
    Currently the most widely used machine for precision seeding of cotton and maize seed is vacuum type. The capture of seeds by vacuum plate and the release of seeds from the vacuum plate should be performed precisely without missing or doubling. The physical phenomena should be clarified theoretically to understand how the precision seeding mechanism works. To solve these problems, an attempt was made to develop a nomogram using equations describing the technical characteristics of the seeder used in this study and to describe the seed capture mechanism relying on basic principles of fluid mechanics and aerodynamic properties of seeds. Seed spacing accuracy tests were performed to test the theory on a sticky belt in the laboratory. Quality of feed index, miss and multiple indices, and precision have been taken as a set of criteria for seed spacing accuracy. The regression models developed using the data obtained via sticky band tests showed that 16 seeds s-1 was the upper limit of seed release frequency (SRF) for cotton and maize seeds. The upper limit of vacuum plate peripheral speed was found to be 0.34 m s-1. The use of 72 holes instead of 26 holes in the vacuum plate at 6.3 kPa created a vacuum band in the width of 10 mm around holes and this increased the multiple index and caused a reduction in seeding performance. For this reason, the use of vacuum plates with 60 or 52 holes is recommended for cotton seed. The forward speed of either 1.0 or 1.5 m s-1 was found to be acceptable for the seed spacing of 0.05 and 0.10 m, respectively. Aerodynamic calculations verified that widely used vacuum plates with 26 holes were the appropriate ones for seeding maize seeds. The performance indices, namely the quality of feed, and miss and multiple indices, reduced significantly for cotton and maize seeding when the precision metering unit was run at 20% (11°) slope to the right as compared to the no slope condition. © TÜBİTAK.
  • Küçük Resim Yok
    Öğe
    Seed flow and in-row seed distribution uniformity of the top delivery type fluted roller for onion, carrot and canola seeds [Üstten aki{dotless}şli{dotless} oluklu ekici makarani{dotless}n sogan, havuç ve kanola tohumlari{dotless} i and {dot}çin tohum aki{dotless}si{dotless} ve si{dotless}ra üzeri tohum dagi{dotless}li{dotless}m düzgünlügü]
    (2011) Önal I.; Ertugrul O.
    In this study, seed flow rate, seed flow evenness and in-row seed distribution uniformity of top delivery normal type straight fluted roller were examined in the laboratory experiments for the random seeding of uncoated onion, carrot, canola and coated canola seeds. The regression models developed in this study included the seed flow rate changes with ´large scale fluted roller's, active flute length, rates of revolution. Generally, seed flow evenness of normal top delivery type fluted roller indicated as a value of coefficient of variation (CV) was found below 4% for onion, carrot and canola seeds. When the sticky belt test results were examined from the point of ? goodness criteria and Vf factor of variation, it was found that seeding unit with top delivery type straight fluted roller considered in the study was capable of sowing of uncoated onion and carrot seeds at ´middlé quality, and coated and uncoated canola seeds at ´good´ quality. © Ankara Üniversitesi Ziraat Fakültesi.