Sunflower planting and emergence with coated seed
1983
Allen, R.R. | Hollingsworth, L.D. | Thomas, J.D.
Air-disk, plate, and plateless drill metering were compared for sunflower seeding accuracy at varying speeds and with different sizes of graded (non-pelleted) seed and pelleted seed. When drill speeds with plate metering were increased from 6.4 to 8.0 km/h, the seeding rate decreased by 15 and 35%, respectively, for pelleted and graded seed. There was no speed effect with air-disk metering. Plateless metering was more accurate with large seed than were other systems. For each metering system, seeding accuracy was lowest for the smallest seed, but pelleting small seed increased seeding accuracy up to the levels for medium-sized seed. In a growth chamber study, seedlings from pelleted seed emerged sooner with medium soil water content, indicating that the clay seed coating can increase water imbibition and speed germination under some soil water conditions.
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