Evaluation of Pre - emergence Herbicides Efficiency for Weed Control in Curcuma Lanna Snow Fields

Abstract

Weeds are a major problem for Curcuma hybrid cultivation at every growth stage, thereby increasing farmers' cost of labor. Using pre - emergence herbicides may help reduce the cost, but it could have an undesirable impact on plant growth. Therefore, the objective of this research is to assess the effects of pre - emergence herbicide application on Curcuma Lanna Snow germination and growth as well as weed control efficiency, including the incremental costs for using each herbicide. The results showed that application of atrazine at 270 g ai / rai, indaziflam at 10 g ai / rai, isoxaflutole + cyprosulfamide at 9.6 + 9.6 g ai / rai, oxyfluorfen at 47 g ai / rai, pendimethalin at 198 g ai / rai, and sulfentrazone at 115 g ai/rai did not differ significantly and resulted in 74.5 % average weed control efficacy 14 days after application, and did not adversely affect germination, plant height, leaf width, first - leaf unfolding time, and dry weight of C. Lanna Snow 21 days after application. However, marginal analysis revealed that using atrazine as a means for weed control is the most economically efficient. Information about germination, plant growth, weed control efficiency, and marginal efficiency of each chemical indicated that atrazine application was the optimum method for weed control in C. Lanna Snow.