Evaluating Seed-covering Devices and Presswheels for Directly Seeding Mustard and Cabbage

in HortTechnology
Authors:
Regina P. BracyAssociate professor, Louisiana State University Agricultural Center, Louisiana Agricultural Experiment Station, Hammond Research Station, 21549 Old Covington Hwy, Hammond, LA 70403.

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Richard L. ParishProfessor, Louisiana State University Agricultural Center, Louisiana Agricultural Experiment Station, Hammond Research Station, 21549 Old Covington Hwy, Hammond, LA 70403.

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Stands of brassica crops obtained with precision seeders are sometimes inadequate or nonuniform. Although several types of covering devices and presswheels are available from precision seeder manufacturers, the effects of covering devices and presswheels on plant emergence of direct-seeded Brassica crops have not been determined. In Spring and Fall 1996, six crops of mustard [Brassica juncea (L.) Czerniak] and four crops of cabbage (Brassica oleracea L. capitata group) were direct seeded with a precision belt seeder using four covering devices and four rear presswheels. All of the covering devices and presswheels evaluated were adequate for direct seeding mustard and cabbage under the soil moisture conditions and soil type (silt loam or fine sandy loam) found in these experiments. Although poor stands were obtained with all seed covering devices and presswheels when 7.8 inches (199 mm) of rain occurred within 3 days of planting, plant stand of cabbage was greater when the paired arm device was used than with drag-type or no covering devices.

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