Urea and sugarcane straw nitrogen balance in a soil-sugarcane crop system

Pesquisa Agropecuária Brasileira

Glauber José De Castro Gava²  Paulo Cesar Ocheuze Trivelin¹  André Cesar Vitti¹  Mauro Wagner De Oliveira¹ 

[1] ,Agência Paulista de Tecnologia dos Agronegócios Pólo de Desenvolvimento Regional do Centro Oeste Paulista Jaú SP ,Brazil

关键词: N recovery;    fertilizer-15N;    crop residue;    mineralization;    nitrogen use efficiency;    recuperação de N;    fertilizante-15N;    resíduo de colheita;    mineralização;    eficiência de uso de nitrogênio;   

DOI  :  10.1590/S0100-204X2005000700010

来源: SciELO

【 摘 要 】

The objectives of this study were to evaluate nitrogen utilization by sugarcane ratoon from two sources, applied urea and sugarcane straw covering soil surface (trash blanket), besides the recovery of N from both sources in the soil-plant system. The following treatments were established in a randomized block design with four replicates: T1, vinasse-urea (100 kg ha-1 of urea-N) mixture applied on the total area of the soil covered with cane trash labeled with 15N; T2, vinasse-urea mixture (urea labeled with 15N; 100 kg ha-1 of urea-N) applied on the total area of the soil covered with non-labeled sugarcane trash; and T3, urea-15N (100 kg ha-1 of urea-N) applied in furrows at both sides of cane rows, with previous surface application of vinasse, onto soil without trash covering. The vinasse was applied at a rate of 100 m³ ha-1 in all treatments. The experiment was carried out on a Yellow Red Podzolic soil (Paleudalf), from October 1997 to August 1998, in Piracicaba, SP, Brazil. The nitrogen use efficiency of urea by the sugarcane ratoon was 21%, while that of the sugarcane straw was 9%. The main contributions of N from sugarcane trash, during one cycle, are the preservation and increase of the organic N in soil. The tendency for a lower accumulation of urea-N in the sugarcane plant, in the soil surface covered with sugarcane residue, was compensated by the assimilation of N from trash mineralization. Nitrogen derived from cane trash was more available to plants in the second half of the ratoon cycle

【 授权许可】

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