Recycled water causes no salinity or toxicity issues in Napa vineyards
2014
In response to Napa Sanitation District's interest in expanding its delivery of recycled
water to vineyards for irrigation, we conducted a feasibility study to assess the
suitability of the water for this use. We adopted two approaches: comparing the water
quality characteristics of the recycled water with those of other local sources of
irrigation water, and evaluating soil samples from a vineyard that was irrigated for
8 years with the recycled water. Results indicate that the quality of the recycled
water is suitable for irrigation, and also that long-term accumulation of salts and
toxic ions have not occurred in the vineyards studied and are unlikely to occur. Nutrients
in the recycled water may be beneficial to vineyards, though the levels of nitrogen
may need to be reduced by planting cover crops in some vineyards.
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