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Transactions: WSEAS TRANSACTIONS ON ENVIRONMENT AND DEVELOPMENT
Transactions ID Number: 27-593
Full Name: Pedro Correia
Position: Associate Professor
Age: ON
Sex: Male
Address: CDCTPV, University of Algarve
Country: PORTUGAL
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E-mail address: pcorreia@ualg.pt
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Title of the Paper: Combined effects of potassium and wastewater application on the yield and quality of Bermuda grass (Cynodon dactylon) in the Mediterranean regions
Authors as they appear in the Paper: José Beltrão, Rui Santos, Pedro José Correia
Email addresses of all the authors: jbeltrao@ualg.pt; pcorreia@ualg.pt
Number of paper pages: 10
Abstract: The reuse of treated wastewater is considered as an alternative disposable to potable water in the mediterranean agriculture and landscape, namely in golf courses. Bermuda grass (Cynodon dactylon, Peers) is used very often on the fairways, roughs and tees of golf courses of the Mediterranean Basin due to its tolerance to drought, salinity, high temperatures and damages. The objective of this work is to study the response of this cultivar to the combined effects of municipal wastewater and two levels of potassium fertilization, during Spring and Summer. The experimental design known as sprinkle point source was used to simulate the various levels of wastewater application, expressed by the crop coefficient kc. This procedure is characterized by the assumption that a point creates a linear irrigation gradient from the water point source, producing a gradual change in water application, and a high degree of irrigation uniformity must be obtained in parallel isohyets. !
Chemical analysis of wastewater irrigation water was monitored through all the experimental period (from April to September). Climatic data was also recorded. Yield (aboveground biomass) and the good visual appearance (GVA) of the lawn were assessed in two sampling dates, May and July. Municipal wastewater can be used to irrigate Bermuda grass, without an apparent decrease on grass quality. As concluding remarks, it may be seen that the irrigation water amount is the most pronounced limiting production factor of bermuda grass (Cynodon dactilon, Peers), when compared with potassium fertilization, but it is possible that there is a positive interaction between water and irrigation. This response is modulated by evaporative air conditions since lower yields were obtained in summer. On the other hand, if the potassium fertilization is increased, two situations may occur: 1) with high amounts of water application, leaching problems may occur, mainly on sandy soils,!
and production may decrease; 2) if potassium fertilization increases,
and irrigation water decreases, yield decreases due to the increase of salinity (potassium fertilizers are salts), mainly on salt affected soils.
Keywords: GVA – good visual appearance, kc – crop coefficient, salination, leaching, point source
EXTENSION of the file: .doc
Special (Invited) Session: Yield and quality of Bermuda grass (Cynodon dacylon) response to the combined effects of wastewater and potassium application in the Mediterranean Basin.
Organizer of the Session: 518-158.doc
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