The triangular greenness index indicates the weed control efficacy of stored herbicide spray mixtur

Herbicide spray mixture may need to be stored due to mechanical failures, adverse weather conditions, or the use of concentrated spray mixture. Remote sensing has emerged as a valuable tool for assessing pest control efficacy. This study aimed to assess the effect of prolonged storage of spray solution on weed control efficacy using remote sensing. The experiment adopted a randomized block design with four replicates, using a split-plot arrangement. The following factors were analyzed in the present study: four herbicide spray mixture (glyphosate, dicamba, diquat, and 2,4-D) in the main plot, eight storage periods (14, 12, 10, 8, 6, 4, 2, and 0 days before application) in subplots, and seven time points (1, 3, 5, 7, 9, 14, 21, and 28 days after application) in subsubplots. Data analysis involved ANOVA, assumption testing, and Pearson product-moment correlation between methods. The results indicated that stored spray mixture maintain their efficacy in weed control. In addition, the triangular greenness index effectively estimated the weed control efficacy of all herbicides studied, i.e., glyphosate, dicamba, diquat and 2,4-D.