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39th IAD Conference, August 2012, Szentendre, Hungary Table 1. Suitability of irrigation water according to the classifications used in the study Watercourse/ classification Danu -be Tisa Sava Tami s Bege j Zlatica DTD HS Nejgebauer * Max II Min Ia Max IIIb Class Class USSL Cl Restriction on use C3-S1 None 232 Salinity Infiltration Slight to moderate FAO Na toxicity Restriction on use Slight to moderate Cl toxicity None None C1-S1 None None None None None C3-S1 For sensitive plants Slight to moderate Severe Slight to moderate Slight to moderate Min II C1-S1 None None None None None Max Ib C3-S1 None Slight to moderate Severe None None Min Ia C1-S1 None None None None None Max II C3-S1 For sensitive plants Slight to moderate Severe Slight to moderate None Min Ia C1-S1 None None None None None Max IVb C4-S2 For semitolerant plants Slight to moderate Slight to moderate Slight to moderate Slight to moderate Min II C1-S1 None None None None None Max IVb C4-S3 Should not be used Severe Slight to moderate Slight to moderate Slight to moderate Min II C2-S1 None None None None None Max IVb C4-S2 For semitolerant plants Slight to moderate Severe Slight to moderate Slight to moderate Min II C1-S1 None None None None None * According to this classification, irrigation water is divided into four classes, according to the amount of TDS and ratio (Ca+Mg):Na. First class – excellent water quality (Ia - SO3; Ib - Ia - SO3). Second class – good water quality (SO1). Third class –water quality should be tested (IIIa – SO=700-3000mg/l, (Ca+Mg):Na>3; IIIb - SO=700-3000mg/l, (Ca+Mg):Na>1). Fourth class – unsuitable water quality (IVa – SO
39th IAD Conference, August 2012, Szentendre, Hungary Nejgebauer, most of the analyzed waters were in classes II or III, with occasional samples in class IVb. According to the USSL classification, the analyzed waters were class C3S1 or worse. The FAO classification indicated that a significant number of the samples posed a hazard of salinization that could be associated with deterioration of infiltration properties of soil and in some instances there was a hazard of toxic ions. Concerning the additional assessment of irrigation water quality, the recorded SSP and SAR values indicated the presence of significant amounts of sodium. Even the values of RSC, RSBC and PI were significantly over the recommended limit values. The canal network of the Danube-Tisza-Danube Hydro System (DTD HS) should play an important role in the development of irrigation in Vojvodina. Therefore, it is important to establish the current water quality status in the canal network. There was a mild decreasing trend for water quality and there was an increasing mineralization trend in most of the analyzed samples. In the region of Backa, about one third of the waters were classified in C3S1 class. Two thirds of the waters were in class II according to Nejgebauer. These waters can be used for irrigation. Unfavorable SSP ratios, frequently accompanied by unfavorable RSC values, were simultaneously recorded at the same locations. Based on these results, the waters in DTD HS in the region of Backa can be recommended for irrigation of well-drained soils, providing that the status of the irrigated soils is systematically monitored. A similar situation was found in the analyzed DTD HS locations in the region of Banat, noting that the dominant classes were C3S1 according to the USSL and class II according to Nejgebauer. In the Banat locations, SSP values were as a rule significantly higher than the recommended values. Table 2. Additional procedure for irrigation water assessment Watercourse/Additional irrigation water assessment Danube Tisa Sava Tamis Begej Zlatica DTD HS MAR (%) SSP (%) RSC (meq x l -1 ) 233 RSBC (meq x l -1 ) PI (%) KR (meq x l -1 ) SAR (meq x l -1 ) Max 86.96 31.87 2.00 2.74 128.96 0.56 1.52 Min 15.15 5.09 -3.26 -1.72 33.79 0.04 0.11 Max 76.92 62.06 4.50 4.69 98.57 1.55 2.31 Min 8.37 3.66 -3.15 -0.89 33.71 0.03 0.10 Max 81.37 22.54 1.29 2.87 78.70 0.27 0.80 Min 7.60 3.34 -3.15 -0.83 31.83 0.03 0.08 Max 62.19 68.88 2.32 3.89 93.57 2.17 5.67 Min 9.20 6.51 -1.92 -1.42 41.29 0.06 0.14 Max 85.10 69.42 12.93 18.43 95.92 1.99 5.52 Min 18.51 9.96 -3.56 -0.54 37.32 0.07 0.19 Max 53.67 74.96 3.39 5.55 84.83 2.81 10.58 Min 26.75 29.78 -3.64 -1.21 56.89 0.39 1.12 Max 82.54 96.96 8.49 9.05 119.63 2.40 7.47 Min 2.97 3.01 -6.95 -2.65 14.69 0.01 0.04
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INTERNATIONAL ASSOCIATION FOR DANUB
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The conference was organized under
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Content Keynote lectures Macrophyte
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Content Bioassessment of a heavily
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Keynote lecture
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Topic 1: Ecological processes in ri
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Topic 2: Longitudinal, vertical and
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Secchi depth [m] 0.0 0.2 0.4 0.6 0.
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Discussion 39th IAD Conference, Aug
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Acknowledgments 39th IAD Conference
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Topic 3: Changes in biodiversity Hi
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References 39th IAD Conference, Aug
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Topic 6: Environment and infrastruc
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Topic 8: Technical aspects and the
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Mapping of the virtual scenery 39th
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Outlook 39th IAD Conference, August
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Topic 9 Restoration ecology, landsc
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Results for the Danube 39th IAD Con
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a) c) 39th IAD Conference, August 2
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Topic 2 Longitudinal, vertical and
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Suggestions for proper operation 39
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