Data/hora: 24/06/2024 06:00:35

Biblioteca(s): 	Embrapa Pesca e Aquicultura.	
Data corrente: 	26/01/2018	
Data da última atualização: 	26/01/2018	
Autoria: 	KOHMANN, M. M.; SOLLENBERGER, L. E.; VENDRAMINI, J. M. B.; SILVEIRA, M. L.; MORENO, L. S. B.	
Afiliação: 	MARTA M. KOHMANN, UNIVERSITY OF FLORIDA; LYNN E. SOLLENBERGER, UNIVERSITY OF FLORIDA; JOAO M. B. VENDRAMINI, UNIVERSITY OF FLORIDA; MARIA L. SILVEIRA, UNIVERSITY OF FLORIDA; LEONARDO SIMOES DE BARROS MORENO, CNPASA.	
Título: 	Harvest stubble height and K fertilization affect performance of Jiggs and 'Tifton 85' bermudagrasses.	
Ano de publicação: 	2017	
Fonte/Imprenta: 	Crop Science, v. 57, n. 6, p. 3353-3359, Nov./Dec. 2017.	
DOI: 	10.2135/cropsci2017.05.0308	
Idioma: 	Inglês	
Conteúdo: 	Use 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&#8722;1 harvest&#8722;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.	
Palavras-Chave: 	Nitrogen fertilization.	
Thesagro: 	Cynodon Dactylon; Grama bermuda; Proteina.	
Thesaurus Nal: 	Crude protein; Fertilizer application; Stubble.	
Categoria do assunto: 	X Pesquisa, Tecnologia e Engenharia	
Registro original: 	Embrapa Pesca e Aquicultura (CNPASA)	
Exemplares: 	CNPASA - (636-1) - UPC - AP - DD - CNPASA_AP83 -  - 2017.083 - DIS