Indaziflam performance in coffee cultivation under different soil cover materials: agronomic efficacy, residual effect, and weed community.

Abstract

The objective of this study was to assess the performance of indaziflam under different soil cover materials in coffee cultivation, focusing on its agronomic efficacy, residual effects, and influence on the weed community. The studies were carried out at two farms: IPACER (sandy clay Oxisol - OXI_sc) and Glória (clay Oxisol - OXI_cl). Evaluation factors included the application of indaziflam (75 g a.i. ha^-1), different soil cover materials (crop debris, organic compost, and bare soil), and the evaluation period was from 30 to 180 d after application (DAA). The agronomic efficacy and residual effect were assessed by injury level, and the indaziflam's residual lifetime (RL₅₀) was estimated using a first-order model. Phytosociological parameters, including absolute and relative frequency, density, abundance, and the importance value index, were evaluated. The results indicated that agronomic efficacy remained above 90% until 120 DAA in all treatments with indaziflam application, with RL₅₀ exceeding 180 days. Weed indices were higher in areas without indaziflam, but treatment similarity analysis revealed that the weed community was primarily influenced by soil type, with a lesser impact from soil cover. Neither crop residues nor organic compost compromised indaziflam efficacy, indicating their suitability for coffee cultivation without the need to increase herbicide doses.