ระยะวิกฤตสำหรับป้องกันกำจัดวัชพืชในแปลงปลูกปทุมมาพันธุ์ลานนาสโนว์

Abstract

Weeds are an important agricultural pests, because it’s have the ability to compete with crops for the growth factors. To avoid weed competition, the control should be carried out during an appropriate weed control period. This research therefore aims to determine the critical period for weed control in Curcuma alismatifolia field. The experiment was conducted in two seasons during May to January at 2020 - 2021 and 2021 - 2022. The results showed that, the different periods of weed infestation and weed free affect to the growth and development of C. alismatifolia. In the first season, the weed infestation periods at 2 - 16 weeks after planting, before eliminating weeds throughout the season affect to the clump weight and the number of rhizome of C. alismatifolia tend to decrease, while weed free periods at 2 - 16 weeks after planting, before weeds infestation throughout the season affect to the clump weight and the number of rhizome of C. alismatifolia tend to increase. For the second season, the weed infestation periods at 12 - 16 and 10 - 16 weeks after planting, before eliminating weeds throughout the season affect to the clump weight and the number of rhizome of C. alismatifolia tend to decrease, respectively. However, the clump weight and the number of rhizome of C. alismatifolia tend to increase with longer weed control periods. In addition, the critical period for weed control in Curcuma alismatifolia field based on acceptable yield loss of the rhizome number at the level of 5 percent indicated that the critical period for weed control of the first seasons is 1 - 14 weeks after planting and the critical period for weed control of the second season is 2 - 12 weeks after planting.