Several species also have NOECs that are orders of magnitude lower than the 100-ppb soil threshold.
Certain antibiotics at concentrations < 100 ppb may inhibit a significant fraction of clinically relevant bacteria in the environment; the high potentially affected fractions for erythromycin and ciprofloxacin at the 100-ppb soil threshold are a clear example of this.
Also, the feed in tariff (FIT) is critical on this soiling threshold.
For estimating cleaning cost of PV fields, the design and simulations of PV power plants in Algerian Sahara sites of Adrar (1 MW) and Ouargla (5 MW) demonstrated the existence of soiling threshold allowing cleaning profitability which is situated around 7% in term of minimal level.
Schedules refer to different soil water thresholds, and fixed (40 mm) and variable net irrigation depths, which range form 30 to 54 mm.
The beginning and end of the critical growth stages in question were obtained from DSSAT model runs, and weather data during these stages were evaluated for days exceeding temperature or soil water thresholds as indications of adverse environmental conditions (Table 1).
In the UK, soil contamination thresholds triggering closure or remediation of allotment and garden sites are based on precautionary principles, generating 'scares' that may negatively impact public health disproportionately to the actual health risks of exposure to toxins through own-grown food.
The residential soil lead threshold for cleanup in California is 80 ppm.
For field-moist samples, a critical soil water threshold, below which water repellency prevails, was estimated to be 2.5 4%.
Testing was performed on two types of SMS controllers (LawnLogic LL1004 and Acclima Digital TDT RS500) at three soil moisture threshold settings.
The western regions showed an increase of percentage of days below the soil water threshold during flowering in the med and max projections, in particular at sites DH and FL.
