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Abstract
Emergence and establishment of Brassica spp. under adverse environmental conditions found in the Southern Great Plains appear to be major constraint in the production of spring forage. peld experiments, using 'Purpletop' turnip (Brassica rapa L.) and 'Qfon,' a turnip x Chinese cabbage hybrid [B. rapa L. x B. pekinensis (Lovr) Rupr.], were conducted on Dale silt loam (fine-silty, mixed, thermic, Pachic Haplustoll) soils near El Reno, Oklahoma. Unprimed seeds and seeds primed with PEG 8000 (polyethylene glycol 8000) were planted in burned and unburned plots of bermudagrass [Cynodon dacrylon (L.) pers. cv. Midland] sod at the rate of 2.5 kg ha-' in February 19i6 and 1987 with a no-till drill. After seedling emergence, N (100 kg ha-') and b (60 kg ha-') were broadcast to all plots. Seedling emergence 25 d after seeding was similar for both cultivars in 1986, but Purpletop exhibited greater (P < 0.05) seedling emergence than Qfon in 1987. Priming seeds with PEG increased (P < 0.05) seedling emergence over unpr...
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