期刊论文详细信息
Revista Brasileira de Ciência do Solo
15N uptake fom manure and fertilizer sources by three consecutive crops under controlled conditions
Héctor Mario Quiroga Garza2  Jorge A. Delgado1  José Antonio Cueto Wong1  William C. Lindemann1 
[1] ,Instituto Nacional de Investigaciones Forestales, Agrícolas y PecuariasCoahuila,México
关键词: denitrification;    nitrogen use efficiency;    annual ryegrass;    salinity;    sudangrass;    denitrificação;    eficiência de uso do nitrogênio;    raygrass anual;    salinidade;    sudangrass;   
DOI  :  10.1590/S0100-06832009000500018
来源: SciELO
PDF
【 摘 要 】

There are several regions of the world where soil N analysis and/or N budgets are not used to determine how much N to apply, resulting in higher than needed N inputs, especially when manure is used. One such region is the North Central "La Comarca Lagunera", one of the most important dairy production areas of Mexico. We conducted a unique controlled greenhouse study using 15N fertilizer and 15N isotopic-labeled manure that was labeled under local conditions to monitor N cycling and recovery under higher N inputs. The manure-N treatment was applied only once and was incorporated in the soil before planting the first forage crop at an equivalent rate of 30, 60 and 120 Mg ha-1 dry manure. The 15N treatments were equivalent to 120 and 240 kg ha-1 (NH4)2SO4-N for each crop. The total N fertilizer for each N fertilized treatment were 360, and 720 kg ha-1 N. We found very low N recoveries: about 9 % from the manure N inputs, lower than the 22 to 25 % from the fertilizer N inputs. The manure N recovered belowground in soil and roots ranged from 82 to 88 %. The low recoveries of N by the aboveground and low soil inorganic nitrate (NO3-N) and ammonium (NH4-N) content after the third harvested suggested that most of the 15N recovered belowground was in the soil organic form. The losses from manure N inputs ranged from 3 to 11 %, lower than the 34 to 39 % lost from fertilizer N sources. Our study shows that excessive applications of manure or fertilizer N that are traditionally used in this region will not increase the rate of N uptake by aboveground compartment but will increase the potential for N losses to the environment.

【 授权许可】

CC BY   
 All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License

【 预 览 】
附件列表
Files Size Format View
RO202005130053790ZK.pdf 746KB PDF download
  文献评价指标  
  下载次数:3次 浏览次数:3次