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Table 1.

Estimated nutrients supply at an irrigation rate of 500–925 by Viognier B plot and 450–875 m3 ha−1 by Carignan N plot in treatments TWW-C1 and TWW-C2, respectively, in 2017 growing season, compared to annual fertilization needs of grapevine.

Parameters Viognier Carignan Annual fertilisation-needs* Unit
TWW-C TWW-C
1 2 1 2
Total Nitrogen 21 39 19 37 20 – 70 kg N ha−1
Phosphorus 0.6 1.1 0.5 1.0 3 – 10 kg P ha−1
Potassium 15 28 14 27 25 – 70 kg K ha−1
Calcium 45 84 41 79 39 – 80 kg Ca ha−1
Magnesium 11 19 9 18 6 – 15 kg Mg ha−1
Sulfate 25 47 23 44 6 kg S ha−1

TWW-C: treated wastewater quality C; 1: standard irrigation; 2: reinforced irrigation; *Galet P. (1993) [34].

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