Nitrogen and phosphorus leaching in a tropical Brazilian soil cropped with sugarcane and irrigated with treated sewage effluent

被引:26
作者
Blum, Julius [1 ,2 ]
Melfi, Adolpho Jose [1 ,2 ]
Montes, Celia Regina [2 ,3 ]
Gomes, Tamara Maria [4 ]
机构
[1] Univ Sao Paulo, ESALQ, Dept Ciencia Solo, Piracicaba, SP, Brazil
[2] Univ Sao Paulo, Nucl Pesquisa Geoquim & Geofis Litosfera NUPEGEL, Piracicaba, SP, Brazil
[3] Univ Sao Paulo, CENA, Lab Anal Ambiental & Geoproc, Piracicaba, SP, Brazil
[4] Univ Sao Paulo, Fac Zootecnia & Engn Alimentos, Dept Engn Alimentos, Pirassununga, SP, Brazil
基金
巴西圣保罗研究基金会;
关键词
Drainage; Groundwater pollution; Wastewater; Error propagation; Soil solution; LAND APPLICATION; WASTE-WATER; ADSORPTION; INDICATOR; QUALITY;
D O I
10.1016/j.agwat.2012.11.010
中图分类号
S3 [农学(农艺学)];
学科分类号
0901 ;
摘要
There are concerns about groundwater contamination with N and P from fertilizers and other anthropogenic wastes. Use of treated sewage effluent (TSE) for crop irrigation can reduce the use of mineral fertilizers; however, it may add more nutrients into the soil than are necessary for crops, increasing the possibility of leaching. Thus, knowledge of nutrient dynamics in TSE irrigated soils is important for the safe use of this resource. However, the reliability of studies regarding ion leaching is limited due the high propagated variance, as these studies involve independent measurements of variables related to soil and soil solution. The objective of this research was to quantify P and N leaching in a TSE-irrigated Brazilian soil and identify the main causes of variance of this quantification. The experiment consisted of a treatment without irrigation and treatments with TSE irrigation to meet 100% and 150% of the crop water demand (CWD). Soil physical properties and soil water potential gradient were used to calculate internal drainage, and nutrient concentration was measured in soil solution samples taken with ceramic suction cups at a depth of 1 m. Variance propagation was calculated by linearization, and the contribution of each variable to the total variance was isolated and quantified. Irrigation with TSE increased N leaching; however, when applied in dosages that met 100% of the CWD, it did not threaten the groundwater quality. P leaching was as low as 100 g ha(-1) and was therefore not an environmental concern. N leaching can be estimated considering the total N input and the rainfall; however, long-term data are needed to improve the accuracy of this estimation. The variance propagation of the soil water potential measurements represented up to 70% of the nitrogen leaching variance. (c) 2012 Elsevier B.V. All rights reserved.
引用
收藏
页码:115 / 122
页数:8
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