A study on the Use of Low and Wet Land By Underdrainage(1)

암반비수에 의한 저온지이용에 관한 연구(1)

Althow underdrainage has been studied for long time, it is the first attempt in Korea to execute using PVC(Plastic) suction pipes in the low and wet field. First, an execution plot and a control plot were set, and the drainage method and soil temprature in the excuted plot have been examined. The growth of crops and the yeild, the improvement of soil and water quality of irrigation are to be dealt during the next experimental period. The experimental method and the results obtained through the experimentations are as follows: Method 1) Depth: 1meter. interval: 5meters Trench was performed by labor. 2) PVC(plastic) sucking pipe filters were wound with glass nylon. 3) Two. horizontal looks were set in the 5a. plot. Results 1) The soil temprature in the excuted plot went up by $1.2^{\circ}C$ in average than in the control plot during the two years(1966-67) of irrigation period, and the maximum temprature raised a day was $3^{\circ}C$ 2) The under ground water level in the executed plot went down by 45cm. 3) The yield increases were 64% in potato, 57% in barley, and 21% in rice. The yield, soil, and the quality of irrigated water will be experimented during the next experemental period.

본(本) 실험(實驗) 실시(實施)함에 있어서 포장(圃場) 10a를 시공구(施工區) 5a, 대비구(對比區) 5a로 나누고 시공구(施工區)는 인력(人力)으로 터파기를 하는데 깊이 1m, 거리 5m 경사(傾斜) 200분지(分之)1로 하고 관경(管徑) 4.5cm의 plastic 제(製) 흡수관(吸水管) (Glass nylon filter 권(卷))을 시공구(施工區) 5a에 pipe 전소요량(全所要量)이 100m (2.5m, 40개)이며 배수조절용수갑(排水調節龍鬚閘)은 2개소(個所) 설치(設置)하여 관개기(灌漑期)에는 매일(每日) 오후(午後) 5시(時)에 개방(開放)하고 오전(午前) 6시(時)에 닫어 지온(地溫)을 측정(測定)한 결과(結果), 평균(平均) $1.2^{\circ}C$ 상승(上昇)하고 비관개기(非灌漑期)는 맥류(麥類) 및 서류재배(薯類栽培)를 위(爲)해서 수갑(水閘)을 종일(終日)열어 배수(排水)의 목적(目的)을 달성(達成)시켜 서류(薯類) 및 맥류재배(麥類栽培)가 전연불가능(全然不可能)한 저온지(低溫地)가 재배가능(栽培可能)하였으나 배수(排水)와 지외(地外), 생육(生育), 수량(收量), 토양(土壤), 관개수질조사(灌漑水質調査)는 제이차(第二次) 시험(試驗)에서 취급(取扱)하기로 하겠다.