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Study on Weeds Fresh Weight Standard for Herbicide Efficacy Evaluation  [2018]

Kim, M.J., Nonghyup Chemical Research Institute, Okcheon, Republic of Korea Kang, K.S., Dongbangagro, Technical Research Institute, Buyeo, Republic of Korea Lim, E.S., Plant Protection Institute, Gimpo, Republic of Korea Song, J.E., Hankooksamgong Agricultural Research Center, Gimje, Republic of Korea

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This study was conducted to establish standard fresh weight data about the minimum amount of occurred weeds at untreated paddy fields, upland fields and orchard fields (including non-cultivated land) in 10 areas. The amount of occurred weeds in each area was compared fresh weight with dry weight. The average percentage for ratio of dry weight to fresh weight in paddy fields was concluded to be 14.8% of Echinochola crus-galli, 12.5% of annual weeds (including Echinochola crus-galli), and 13.9% of perennial weeds. The average percentage for ratio of dry weight to fresh weight in upland fields was concluded to be 20.1% of annual weeds and in orchard fields was concluded to be 18.4% of annual and perennial weeds. According to the research, standard fresh weight about the minimum amount of occurred weeds at untreated paddy fields was proposed to 210 g m-2 of Echinochola crus-galli, 400 g m-² of annual weeds (including Echinochola crus-galli), and 220 g m-² of perennial weeds. Standard fresh weight about the minimum amount of occurred weeds at untreated upland fields was proposed to 250 g m-² of annual weeds and at untreated orchard fields was proposed to 550 g m-² of annual and perennial weeds.

From the journal

Weed and Turfgrass Science

ISSN : 2287-7924