Treated sewage effluent: Agronomical and economical aspects on bermudagrass production

• Published in: Agricultural water management Vol. 116; pp. 151 - 159
• Main Authors: Nogueira, S.F., Pereira, B.F.F., Gomes, T.M., de Paula, A.M., dos Santos, J.A., Montes, C.R.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.01.2013; Elsevier
• Subjects: Agricultural and forest climatology and meteorology. Irrigation. Drainage; Agronomy. Soil science and plant productions; Bermudagrass; Biological and medical sciences; Fundamental and applied biological sciences. Psychology; General agronomy. Plant production; Nitrogen; Plant nutrition; Reclaimed wastewater; Sewage effluent; Water reuse; Sewage effluent; Bermudagrass; Nitrogen; Plant nutrition; Water reuse; Reclaimed wastewater; Non metal; Recycled water; Monocotyledones; Waste water; Group VA element; Cynodon; Gramineae; Angiospermae; Production; Water engineering; Herbaceous plant; Spermatophyta; Recycling; Waste water purification; Effluent
• ISSN: 0378-3774; 1873-2283
• DOI: 10.1016/j.agwat.2012.07.005

► Treated sewage effluent saves 33% of N fertilizer for bermudagrass production. ► Treated sewage effluent increases dry matter of bermudagrass with 7Mgha−1year−1. ► Treated sewage effluent increases the benefit–cost ratio of bermudagrass production. This study investigated the effects of irrigation using treated sewage effluent (TSE) combined with nitrogen (N) fertilization on the productivity and quality of bermudagrass, and on its economic feasibility under tropical conditions. The treatments employed were SI – no irrigation and no fertilization; A100 (control) – irrigation with potable water plus 520kgNha−1year−1 provided as NH4NO3; E0, E33, E66, and E100: irrigation with treated sewage effluent plus 0, 172, 343 and 520kgNha−1year−1 as NH4NO3, respectively. Chemical properties of TSE, shoot dry matter production, N concentration in bermudagrass were determined, and benefit–cost and economic viability analyses were carried out. Tree years of irrigation with TSE had agronomical benefits to bermudagrass such as: (i) saving 33% in N fertilizer by adding of 275kgNha−1year−1, increasing N accumulation in the soil; (ii) providing 70% of the N as NH4+, which is the form most quickly assimilated by the plants; (iii) building up dry matter production with 7Mgha−1year−1 and (iv) increasing leaf N concentration in leaf tissue. The main benefit of TSE irrigation occurs in drought seasons with the increase in N concentration in bermudagrass shoots. Higher N concentration in leaf tissue elevates the quality and the sales price for the grass harvested, thus optimizing the benefit–cost ratio for the producer. Therefore, TSE irrigation is a viable cost-effective alternative if the N concentration in the leaf tissue is considered in the sales price.