Confined rotational crop study (quantitative aspect)

In the available confined rotational crop study performed with a bare soil application at 0.454 kg/ha, the lowest total radioactive residues (TRR) were found in wheat grains and red beet roots ranging from 0.03 to 0.07 mg/kg. In all other rotated crops, TRRs were higher, accounting for up to 0.26 and 0.24 mg/kg in red beet leaves and Swiss chard and for up to 1.0 and 2.38 mg/kg in wheat forage and straw, respectively. Although residues in rotated crops decreased with soil ageing, TRR after the third rotation (408 days) were still significant, ranging from 0.03 mg/kg in wheat grain to 0.96 mg/kg in wheat straw. These results suggests possible soil uptake, even at long plant‐back intervals

Field rotational crop study

In the available rotational crop field study performed with a bare soil application of imidacloprid at 1 × 0.15 kg/ha, no residues above the LOQ of 0.05 mg/kg were found in rotational crops. Nevertheless, imidacloprid concentration tested in the rotational field studies (0.16 mg/kg soil) is not covering the soil concentration expected from annual and multiannual applications according to the most critical indoor GAP currently authorised for sweet peppers (calculated as 0.203 mg/kg soil and as 0.348 mg/kg soil, respectively). Consequently, following both annual and multiannual applications of imidacloprid according to the most critical GAP currently authorised for sweet peppers, a possible uptake by crops grown in rotation cannot be excluded

LOQ: limit of quantification; GAP: Good Agricultural Practice.