HIGHLIGHTS
SUMMARY
The experimental factor was spraying the lawn with the amino_acid preparation in the form of AMINO ULTRA Fe-20 fertilizer in three doses: 0.3, 0.5, and 0.7 dm3 ·ha-1. For Cu and Zn, the lowest values were obtained for the controls (7.33 mg·kg-1 (d.m.) ± 1.31 mg·kg-1 (d.m.) and 40.1 mg·kg-1 (d.m.) ± 2.97 mg·kg-1 (d.m.), respectively), and the highest for fertilization variant III (8.28 mg·kg-1 (d.m.) ± 0.82 mg·kg-1 . . .
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