|
|
|
|
| |
|
|
| Vitti,André Cesar; Franco,Henrique Coutinho Junqueira; Trivelin,Paulo Cesar Ocheuze; Ferreira,Danilo Alves; Otto,Rafael; Fortes,Caio; Faroni,Carlos Eduardo. |
| O objetivo deste trabalho foi avaliar a recuperação, pela cana-planta, do nitrogênio (15N) proveniente da ureia e de resíduos culturais da palhada e do sistema radicular da cultura da cana (Saccharum spp.) incorporados ao solo. O experimento foi instalado na safra de 2005/2006, com a cultivar SP81-3250. No plantio, foram instaladas microparcelas de 1,5x2 m, em que aplicaram-se doses equivalentes a 80 kg ha-1 de N (ureia com 5,05% de 15N) e 14 Mg ha-1 de resíduos culturais, dos quais 9 Mg ha-1 de palhada (PA) e 5 Mg ha-1 de sistema radicular (SR), marcados com 15N (1,07 e 0,81% de 15N, respectivamente). Durante o ciclo da cultura, determinou-se o acúmulo total de N da planta. Embora o aproveitamento do N oriundo da mineralização dos resíduos culturais (PA e... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Saccharum; Cana-de-açúcar; 15N; Raízes; Ureia. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2011000300009 |
| |
|
|
| Franco,Henrique Coutinho Junqueira; Otto,Rafael; Vitti,André Cesar; Faroni,Carlos Eduardo; Oliveira,Emídio Cantídio de Almeida; Fortes,Caio; Ferreira,Danilo Alves; Kölln,Oriel Tiago; Garside,Alan Leslie; Trivelin,Paulo Cesar Ocheuze. |
| ABSTRACTThe low effectiveness of nitrogen fertilizer (N) is a substantial concern that threatens global sugarcane production. The aim of the research reported in this paper was to assess the residual effect of N-fertilizer applied at sugarcane planting over four crop seasons in relation to sugarcane crop yield. Toward this end three field experiments were established in the state of São Paulo, Brazil, during February of 2005 and July of 2009, in a randomized block design with four treatments: 0, 40, 80 and 120 kg ha−1 of N applied as urea during sugarcane planting. Within each plot, a microplot was established to which 15N-labeled urea was applied. The application of N at planting increased plant cane yield in two of the three sites and sucrose content at... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Saccharum; Urea; Nitrogen fertilization; Isotopic technique. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000600528 |
| |
|
|
| Kölln,Oriel Tiago; Franco,Henrique Coutinho Junqueira; Ferreira,Danilo Alves; Vargas,Vitor Paulo; Castro,Saulo Augusto de Quassi; Cantarella,Heitor; Caldana,Camila; Trivelin,Paulo Cesar Ocheuze. |
| ABSTRACT Retaining the mineral N in the form of NH4+ in the soil for a lengthy period is desirable for reducing losses. Furthermore, there is evidence that sugarcane prefers NH4+-N in place of NO3−-N. This study aimed firstly, to evaluate the potential of root extracts of Bracchiaria humidicola andSaccharum spontaneum, in contrast with the DCD (Dicyandiamide) inhibitor, to increase absorption of N by plants fertilized with ammonium sulfate, and secondly, to quantify the emission of N2O fluxes with the use of this inhibitor. The experiment was developed in a glasshouse in an entirely randomized design where four treatments were applied: AS) ammonium sulfate (control); AS+DCD) ammonium sulfate associated with dicyandiamide; AS+BCH) ammonium sulfate... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Ammonium; Nitrate; Dicyandiamide; Nitrification; Nitrous oxide. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000100034 |
| |
|
|
|
