İsmet ÖNAL, Adnan DEĞİRMENCİOĞLU, Arzu YAZGI

An evaluation of seed spacing accuracy of a vacuum type precision metering unit based on theoretical considerations and experiments

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.

Anahtar Kelimeler:

Key words: Precision seeding, seeding performance, vacuum plate

An evaluation of seed spacing accuracy of a vacuum type precision metering unit based on theoretical considerations and experiments

Keywords:

Key words: Precision seeding, seeding performance, vacuum plate,

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Barut ZB (1996) Farklı tohumların ekiminde kullanılan düşey plakalı hava emişli hassas ekici düzenin uygun çalışma koşullarının saptanması. Doktora Tezi. Çukurova Üniversitesi, Fen Bilimleri Enstitüsü, p.157.
Bayat A, Zeren Y, Yaldız O, Gencer O (1993) Havsız pamuk tohumluğu ekim teknikleri üzerinde bir araştırma. In: Proceedings of the 5th Int. Cong. on Mechanization and Energy in Agriculture (Eds Ü Evcim, A Yaltırık, H Bilgen, KO Sındır), Aydın, pp. 246-256.
Corley TE, Stokes CM, Kummer FA (1959) Mechanized cotton production in Alabama. Agricultural Experiment Station, Auburn University Circular 127, Auburn, Alabama. p. 28.
Demmel M, Hahnenkamm O, Kormann G, Peterreins M (2000) Gleichstandsaat bei Silomais. Landtechnik 55: 210-211.
Eck B (1958) Technische Strömungslehre. Springer-Verlag, Berlin
Gorial BY, O’Callaghan JR (1990) Aerodynamic properties of grain/ straw materials. J Agr Eng Res 46: 275-290.
ISO (1984) Sowing equipment- Test methods. Part 1: Single seed drills (precision drills). ISO Standard 7256/1-1984 (E). Genéve. Switzerland: ISO.
Irla E (1982) Saemaschine im Praxiseinsatz und in den Vergleichsprüfung. DLZ 1/82: 24-31.
Irla E, Heusser J (1991) Einzelkornsaemaschinen im Vergleich. Forschungsanstalt für Betriebswirtschaft und Landtechnik (FAT)-Berichte 401, Taenikon TG. p 11.
Jogwich A (1975) Strömungslehre. Verlag W. Girardet, Essen.
Kachman SD, Smith JA (1995) Alternative measures of accuracy in plant spacing for planters using single seed metering. Transaction of the ASAE 38: 379-387.
Mohsenin NN (1970) Physical Properties of Plant and Animal Materials. Gordon and Breach Science Publishers, New York.
Moody FH, Hancock JH, Wilkerson JB (2003) Evaluating planter performance-cotton seed placement accuracy. ASAE Paper No: 03 1146, St Joseph, Michigan.
Önal İ (1981) Seyreltme Yönünden Değişik Ekim Metotlarının Matematik-İstatistik Esasları ve Ülkemiz Koşullarında Pamuk Seyreltmesinin Mekanizasyon Olanakları Üzerinde Bir Araştırma. Ege Üniversitesi, Ziraat Fakültesi Yayınları, No: 388, İzmir.
Önal İ (1987) Vakum prensibiyle çalışan bir pnömatik hassas ekici düzenin ayçiçeği, mısır ve pamuk tohumu ekim başarısı. Ege Üniversitesi Ziraat Fakültesi Dergisi 24: 105-125.
Önal İ (2006a) Ekim, Bakım, Gübreleme Makinaları. Ege Üniversitesi Yayınları,. Ziraat Fakültesi Yayın No: 490. İzmir.
Önal İ (2006b) Tek dane ekimin matematik-istatistik esasları ve ekim makinalarının denemelerinde kullanılması. In: Tarımsal Mekanizasyon 23. Ulusal Kongresi (Eds. I Kavdır, H Kocabıyık, SK Sümer, MB Büyükcan), Çanakkale, pp 97-102.
Önal O, Önal İ (2009) Development of a computerized measurement system for in-row seed spacing accuracy. Turk J Agric For 33: 99-109.
Önal İ, Yazgı A, Değirmencioğlu A (2009) Performance of the metering unit and soil engaging components of a direct seeding machine. Journal of Agricultural Machinery Science 5: 291-302.
Rintelen P (1971) Mais; Ein Handbuch über Produktionstechnik und Ökonomik, DLG Verlag, Frankfurt.
Schön H, Auernhammer H, Bauer R, Boxberger J, Demmel M, Estler M, Gronauer A, Haidn B, Meyer J, Pirkelmann H, Strehler A, Widmann B (1998) Landtechnik Bauwesen. Verfahrenstechnik– Arbeit–Gebaeude–Umwelt. Landwirtschaft sverlag Münster, Hiltrup.
Singh RC, Singh G, Saraswat DC (2005) Optimization of design and operational parameters of a pneumatic seed metering device for planting cotton seeds. Biosystems Engineering 92: 429-438.
Stieger W (1974) Einzelkornerfassung pneumatischer Maiseinzel kornsaegeraete. Dissertation, Institut für Landtechnik der Rheinischen Friedrich-Wilhelms-Universitaet Bonn, p. 181.
Tabak S, Wolf D (1998) Aerodynamic properties of cotton seeds. J Agr Eng Res 70: 257-265.
Wanjura DF (1980) Cotton yield response to plant spacing uniformity. Transactions of the ASAE 23: 56-64.
Wenner HL, Boxberger J, Estler M, Kromer KH, Schön H, Strehler A (1980) Landtechnik Bauwesen Teil B Verfahrenstechniken P f l a n z e n p r o d u k t i o n – F u t t e r b a u – T i e r p r o d u c t i o n . Landwirtschaft sverlag, Münster-Hiltrup
Yazgı A (2010) Vakumlu Tek Dane Ekimde Optimizasyon ve Makina Performansının Matematiksel Modellemesi. Doktora Tezi. Ege Üniversitesi, Fen Bilimleri Enstitüsü, p.189.
Yazgı A, Değirmencioğlu A, Önal İ, Bayram E (2010) Optimization of the seed spacing uniformity performance of a precision seeder using spherical materials and response surface methodology. 2010 ASABE Annual International Meeting. Paper Number 1008560, 17 p., Pittsburg, Pennsylvania.