논밭 윤환재배시(輪換栽培時) 잡초발생양상(雜草發生樣相)을 조사(調査)하여 합리적(合理的)인 잡초방제(雜草防除)를 위한 기초자료(基礎資料)로 활용(活用)코져 실험(實驗)을 수행(遂行)하였다. 논 일년생(一年生) 및 다년생(多年生) 잡초(雜草)의 발생량(發生量)은 수도연작구(水稻連作區)에 비하여 윤환구(輪換區)에서 현저(顯著)히 감소(減少)되었고 밭 기간(期間)이 길수록 적었다. 월년생잡초(越年生雜草)의 발생량(發生量)은 수도연작구(水稻連作區)에 비해 대두(大豆)와 수도(水稻)의 윤환구(輪換區)에서 적었으며 특히 그 경향(傾向)은 뚝새풀 발생량(發生量)에서 뚜렷하였다. 또한 월년생(越年生) 잡초량(雜草量)은 논밭 윤환년수(輪換年數)가 l년<2년<3년의 순(順)으로 밭 기간(期間)이 길수록 증가(增加)하였다. 암거시설(暗渠施設)한 수도연작구(水稻連作區) 포장(圃場)에서의 월년생(越年生) 잡초(雜草) 건물중(乾物重)은 무암거시설포장(無暗渠施設圃場)에서 보다 높았으나 대두연작구(大豆連作區)에서는 그 반대(反對)의 경향(傾向)이었다.
This study was carried out to make the most of them as the fundamental data for reasonable weed control when population of weeds was observed in the alternated fields of lowland and upland. The annual and the perennial paddy weeds in the continuous paddy rice field remarkably decreased when compared to that in the alternated field of paddy rice and soybean. The longer was the duration of upland field condition, the less was the population of lowland weeds and the more was the population of upland weeds. Biennial weeds in the contiuous paddy rice field were less than that in the rotated field of paddy rice and soybean, and this tendency was clear in Alopecurus aequalis Sobol. In the continuous cropping of paddy rice, population of biennial weeds in the culverted field was higher than that in the unculverted one, but in the continuous cropping of soybean this tendency was vice versa.
