ประสิทธิภาพของสารกำจัดวัชพืช คาลารีส® ต่อการควบคุมวัชพืชในข้าวโพดหวาน Efficacy of Calaris on Weed Control

Abstract

Sweet corn is an important crop in Thailand. Weed infestation is commonly on decreasing a growth and yield of the corn both quality and quantity. So, a program of weed management is an essential process. Calaris® is already mixed herbicide including mesotrione 2.5% w/v + atrazine 25% w/v SC. Modes of action of mesotrione is the inhibition of carotenoid synthesis, while atrazine is the photosynthesis inhibition. Calaris® is a selective herbicide registered in maize, corn, and sugarcane by Syngenta Crop Protection Itd. This research aimed to study an efficacy of Calaris® on weed control and its toxicity in sweet corn in order to optimal rate for suggestion. The experimental site was in Sukhothai, Si Samrong District, Khlong Tan Subdistrict, during April to June 2020. A randomized completely block design with 6 treatments and 5 replications including weedy check, hoeing weed control, three of Calaris® by 110, 137 and 165 g ai/rai, and farmer practice, atrazine followed by paraquat. Result showed that all rates of Calaris® had non-significantly on the weed control efficacy but they were higher than hoeing weed control and farmer practice. However, 137 g ai/rai showed more growth and yield of sweet corn than other rates. This result suggested that Calaris® at 137 g ai/rai or 500 mL product/rai was a recommend rate on weed control in sweet corn.