Yield, specific mass and coloration of azuki seeds after desiccation and storage

Abstract

Selection and dosage of desiccating herbicides may bring benefits to bean harvesting and its seed quality. This study aimed to assess yield, apparent specific mass and coloration of azuki bean seeds after pre-harvesting desiccation with different herbicides and doses and subsequent storing. In a first trial, we tested paraquat 400 (g ai ha -1 ), ammonium glufosinate (400 g ai ha -1 ), glyphosate (720 g ai ha -1 ), flumioxazin (30 g ai ha -1 ) and control. In second and third trials, we tested various doses of saflufenacil (0, 50, 75, 100, 150 and 200 g ai ha -1 ) and flumioxazin (0, 20, 25, 30, 35 and 40 g ai ha -1 ). All treatments were divided into plots and the dates of evaluation (at harvest and six months after harvest) into subplots with four replications. Even after storage, paraquat, ammonium glufosinate, glyphosate and flumioxazin had no effect on yield, specific mass or even coloration of azuki bean seeds. None of the doses of saflufenacil and flumioxazin impaired yield, specific mass and L* value of seeds, which is associated to lightness. Nevertheless, after sixmonth storage, the seeds desiccated with saflufenacil and flumioxazin lost color intensity and purity as function of the dose.