S I N G U L A T I N G M A I Z E H A N D P L A N T E R DEVELOPMENT AND EVALUATION OF A SINGULATING MAIZE HAND PLANTER FOR USE IN DEVELOPING COUNTRIES L.

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S I N G U L A T I N G M A I Z E H A N D P L A N T E R DEVELOPMENT AND EVALUATION OF A SINGULATING MAIZE HAND PLANTER FOR USE IN DEVELOPING COUNTRIES L. Aula 1, B.M. Figueiredo 1, N. Macnack 1, S. Dhital 1, J. Mullock 1, E. Miller 1, J.S. Dhillon 1, P. Omara 1, R. Taylor 2 and W. Raun 1. 1 Plant and Soil Sciences, Oklahoma State University 2 Biosystems and Agricultural Engineering, Oklahoma State University INTRODUCTION OBJECTIVE MATERIALS AND METHODS RESULTS DESIGN CONCLUSIONS Maize (Zea mays L.) is one of the most important staple crops for small-holder farmers in the developing world. Maize provides 50% of the calories to third world countries (Ofori et al., 2009). In the developing world, maize planting is accomplished via labor intensive methods. The use of wooden sticks is a common practice (Fig.1) where 2-4 seeds are placed per hill, 40 cm apart. Oklahoma State University has developed a maize hand planter (GreenSeeder) capable of placing one seed per hill and with numerous agronomic benefits. To develop a singulating maize hand planter that delivers at least 85% single seeds and that will result in increased yields and planting efficiency GreenSeeder major components;  Seed hopper, 1.4 m long PVC pipe  Metering unit; Spring Drum Brush Housing  Planter tip  GreenSeeder tested in June 2014  Variables evaluated; Seed sizes: 4069, 3643, 2761 seeds/kg; Drums: 450S, 716M; Housing: H373, H514; Springs: High Strength (HS), Low strength (LS).  Seed sizes tested with springs, drums and housings  Operation; surface struck 100 times  Blank, single, & multiple seeds were recorded  Data analyzed using SAS 9.3 Fig. 3. Percentage of Singles, Doubles and Blanks for Strength of spring  High seed singulation recorded with HS and 2761 seeds/kg. Fig. 5. Performance of the OSU hand planter using different housing and seed size Fig. 4. Performance of Planter with Different Drums and seeds Fig. 6. Percent Blanks, Singles and Doubles using different seed sizes Fig. 1. Farmer in Central America planting maize with traditional metal/wooden stick  Use of drum 450S and 2761 seed size resulted in the highest percent singulation (90%).  Housing and seed size combination had a significant effect on singulation and H373 resulted in 90% singulation.  Singulation significantly higher (86%) with larger seeds than with smaller seeds (44%).  Use of appropriate drum, spring and seed size is vital to achieve high singulation.  Current GreenSeeder offers a viable alternative to traditional stick planting for improving maize production in developing countries.  OSU design also provides an option to apply urea fertilizer, reducing potential volatilization loss. Fig. 2 A. Assembled metering unit; B. (Left to right) External housing, internal housing, spring, drum and lever, tip retainer clip, drum and lever washer and retainer clip and tip; C. H373 External housing; D. H514 External housing; E. 450S Drum; F. 716M Drum; G. Internal brush. a a a a b ab b Different letters above bars with the same color indicate that they are significantly different (p < 0.05) Different letters above bars with the same color, significantly different (p < 0.05) Fig. 7. Urea-N topdress application (left) and a farmer in East Africa planting maize using the GreenSeeder (right) A B C FGE D