Abstract
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 $210g\;m^{-2}$ of Echinochola crus-galli, $400g\;m^{-2}$ of annual weeds (including Echinochola crus-galli), and $220g\;m^{-2}$ of perennial weeds. Standard fresh weight about the minimum amount of occurred weeds at untreated upland fields was proposed to $250g\;m^{-2}$ of annual weeds and at untreated orchard fields was proposed to $550g\;m^{-2}$ of annual and perennial weeds.
본 시험은 논, 밭, 과원(비농경지 포함)에서 주로 발생하는 잡초의 생체중과 건물중을 비교하여 무처리 최소 총 발생량의 생체중에 대한 기초 자료를 확립하고자 10개 지역에서 시험을 수행하였다. 논 포장의 일년생잡초인 피의 건물률 평균은 14.8%, 일년생잡초(피 포함) 건물률 평균은 12.5%, 다년생잡초 건물률 평균은 13.9%로 나타났다. 밭 포장의 일년생잡초의 건물률 평균은 20.1%로 나타났으며, 과원(비농경지 포함)포장 내 일년생 및 다년생잡초 총계의 평균은 18.4%로 나타났다. 이에 따라, 생체중에 대한 무처리 최소 총발생량은 논 포장에서는 피 $210g\;m^{-2}$, 일년생잡초(피 포함) $400g\;m^{-2}$, 다년생잡초 $220g\;m^{-2}$로 제시할 수 있다. 또한, 밭 포장에서는 일년생잡초 $250g\;m^{-2}$, 과원(비농경지 포함) 포장에서는 일년생 및 다년생잡초 총계 $550g\;m^{-2}$으로 제시할 수 있다.