This study evaluated the potential of fulvic acid and greywater irrigation to promote quinoa growth. The study was conducted in a greenhouse in a semiarid region, where quinoa plants were irrigated with greywater and low-salinity water for comparison purposes. They were subjected to the following organic sources of soil conditioners: control (no soil conditioner application), different doses of fulvic acid, and organic matter. Thus, the experiment consisted of a 5 × 2 factorial arrangement. As the main results achieved, it can be highlighted that the application of organic matter or fulvic acid, at doses of 13.4 and 20.1 g L-1, together with irrigation with greywater, provided a better production of quinoa biomass (shot fresh matter of 154, 161, and 141 g, respectively) compared to the control treatment and application of low-salinity water. In addition, the use of soil conditioners, as a result of greywater use, reduced the soil exchangeable sodium percentage (38%) compared to the control treatment (60%). Furthermore, they improved the salt extraction capacity of quinoa, mainly chlorine (44 g m-2), suggesting that quinoa cultivation under greywater + fulvic acid management may be a good alternative for semiarid regions.
Lima et al. (Sat,) studied this question.
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