The Role of Nitrogen Fertilizers in Sugarcane Root Biomass under Field Conditions

• 作者: André Cesar Vitti Carlos Eduardo Faroni Emídio Cantidio Almeida de Oliveira Henrique Coutinho Junqueira Franco Paulo Cesar Ocheuze Trivelin Rafael Otto Renata Alcarde Sermarini
• 来源期刊: 农业科学(英文)
• 学科: 医学
• 关键词: ROOT System RATOON SHOOT Root: SHOOT RATIO
• 年，卷（期）: 2014,（14）
• 页码范围: 1527-1538
• 页数: 12页
• 分类号: R73

摘要

Sugarcane is used worldwide for sugar, ethanol and energy production. In Brazil, the shift from burned to unburned harvest systems resulted in increases in nitrogen fertilization rates, which can impact root architecture and biomass. The expectation is also an increase in sugarcane biomass. The study hypothesized that high N rates applied to sugarcane fields increases root growth and N stored in roots, promoting higher biomass and N accumulated in shoots. Two experiments were set up in Southeastern Brazil, on a Typic Kandiudox (TK) and Rhodic Eutrudox (RE). Four treatments were studied 1) N application in the plant-cane (0 and 120 kg·ha-1 N) and 2) N application in the ratoon (0 and 150 kg·ha-1 N). The shoot biomass and the root density (by the core method up to 0.6 m) were evaluated over the first ratoon crop cycle, and the N content in those compartments was also examined. There was no carry over effect on N applied at planting in root and shoot biomass in the ratoon crop cycle. At the RE site, the ratoon N fertilization increased root density in the superficial soil layer (0 - 0.2 m) and close to the plants (<0.3 m). The effect of N addition on root biomass, and biomass and N accumulated in shoot was limited in both sites. Increasing N rates in unburned sugarcane fields do not consistently increases root and shoot biomass under Brazilian field conditions.