02259naa a2200265 a 450000100080000000500110000800800410001902400370006010000190009724501300011626000090024652014510025565000180170665000270172465000120175165000210176365000180178465000130180265300270181570000240184270000250186670000200189170000210191177300610193220864252018-01-26       2017    bl uuuu     u00u1 u    #d7 a10.2135/cropsci2017.05.03082DOI1 aKOHMANN, M. M.  aHarvest stubble height and K fertilization affect performance of Jiggs and 'Tifton 85' bermudagrasses.h[electronic resource]  c2017  aUse of Jiggs bermudagrass [Cynodon dactylon (L.) Pers.] for hay has increased in warm climates like southern Florida, but effects of defoliation and K fertilizer management on Jiggs adaptation to environments with frequent winter freezes are not known. During 2 yr, K fertilization (0, 17, and 34 kg K ha−1 harvest−1) and cutting stubble height (SH, 8 and 16 cm every 28 d) effects on herbage accumulation (HA), ground cover, K removal, and tissue and soil K were evaluated for Jiggs and ?Tifton 85? (Cynodon spp.) bermudagrasses. All treatments received 240 kg N ha-1 yr-1. Herbage accumulation was greater for 8- than 16-cm SH (8050 and 7330 kg ha-1 yr-1, respectively) and increased linearly from 7040 to 8120 kg ha-1 yr-1 with increasing K fertilization. Potassium fertilization did not affect grass percentage ground cover, but Jiggs had 17 (2014) and 40% (2015) greater cover than Tifton 85. Increasing K fertilization increased tissue K concentration (15 to 19 g kg-1 in 2014 and 13 to 25 g kg-1 in 2015) and K removal in HA (from 104 to 149 kg ha-1 in 2014 and 88 to 216 kg ha-1 in 2015). During 2 yr, soil-extractable K declined 6 mg kg-1 for the zero K level but increased 6 mg kg-1 when K was applied. In a cooler subtropical region characterized by frequent winter freezes and across a range of K fertilizer and SH levels, Jiggs sustained ground cover better than Tifton 85, but K fertilization did not affect persistence.  aCrude protein  aFertilizer application  aStubble  aCynodon Dactylon  aGrama bermuda  aProteina  aNitrogen fertilization1 aSOLLENBERGER, L. E.1 aVENDRAMINI, J. M. B.1 aSILVEIRA, M. L.1 aMORENO, L. S. B.  tCrop Sciencegv. 57, n. 6, p. 3353-3359, Nov./Dec. 2017.