Título:	Sugarcane response to phosphorus sources and placement in a very clayey oxisol of the Brazilian Cerrado.
Autoria:	REIN, T. A. SOUSA, D. M. G. de
Afiliação:	THOMAZ ADOLPHO REIN, CPAC; DJALMA MARTINHAO GOMES DE SOUSA, CPAC.
Ano de publicação:	2013
Referência:	In: INTERNATIONAL SOCIETY OF SUGAR CANE TECHNOLOGISTS CONGRESS, 28., 2013, São Paulo. Proceedings [...]. São Paulo: ISSCT, 2013.
Páginas:	p. 477-485.
Conteúdo:	The sugar-ethanol industry in Brazil has expanded towards the “Cerrado” (savanna) region where sugarcane has replaced pastures on soils with low phosphorus (P) availability. Phosphorus fertilisation on sugarcane in Brazil is largely based on water-soluble fertilisers applied in the planting furrow, leading to high concentration of P in this zone due to high P rates employed and wide row spacings. In this study, alternative placement methods and P sources were evaluated in an experiment established in Brasilia, in a randomised block design with four replications. The soil was a very-fine, mixed, isothermic Rhodic Haplustox with low (1.2 mg/dm3 ) Mehlich-1 P content in the top 0.0–0.2 m, and treatments were applied only to the plant cane (cultivar RB 867515). Treatments consisted of a P response curve ranging from 0 to 400 kg/ha P2O5 as broadcast triple superphosphate (TSP) incorporated with a disk harrow before planting and the following treatments at 200 kg/ha of P2O5: TSP applied at the bottom of the planting furrow (banded); TSP half broadcast and half banded; a Moroccan reactive phosphate rock (RPR) broadcast and banded; and a combination of broadcast RPR and banded TSP. Cane and sugar yields were evaluated for the plant cane and two ratoon crops. Maximum cane yields (129.9, 92.7 and 96.7 t/ha, respectively, for the three harvests) with broadcast TSP at 400 kg/ha P2O5 were on average 89% higher compared to the control (no P) treatment. Comparing the two P sources at 200 kg/ha P2O5, yields for the broadcast TSP and RPR treatments were similar for the three harvests, but when the fertilisers were band-applied, yields were on average 16% lower for the RPR. Comparing the fertiliser placement methods, average yields for broadcast TSP and RPR were 19% and 42% higher than band application, respectively. Combined broadcast and band application treatments were not significantly different compared to exclusively broadcast applications. Results show that increases in sugarcane yield and P fertiliser use efficiency in low-P Cerrado soils could be attained by increasing the volume of soil fertilised with P.
Thesagro:	Cana de açúcar Bioenergia Superfosfato Rocha fosfatada Latossolo
NAL Thesaurus:	Sugarcane Bioenergy Superphosphate Rock phosphate Oxisols
Tipo do material:	Artigo em anais e proceedings
Acesso:	openAccess
Aparece nas coleções:	Artigo em anais de congresso (CPAC)