Effects of Fly Ash and Zeolite Application on Amount of Irrigation Water in Dry Seeded Rice

벼 건답직파(乾畓直播) 재배시(栽培時) 석탄회(石炭灰) 및 제오라이트 시용(施用)이 관개수량(灌漑水量)에 미치는 영향(影響)

This study was conducted in the sandy loam soil to find out the effects of fly ash and zeolite applications on saving of irrigation water which was required great quantities during the cultivation days of dry seeded rice. Total water loss was reduced so rapidly in the early growth stage that n was the least in the 18th day after irrigation. After that day it was increasd due to the growth development and the rising temperature. In the daily mean of decreasing water level during the whole irrigation days, control was 47.7mm but the treatments of fly ash and zeolite were 31.8mm and 35.8mm respectively Amounts of the presumed irrigation water of fly ash and zeolite treatments were lower about 29.1% and 20.9%. respectively than that of control during the whole irrigation days These gaps between control and amendment treatments were greater in the early growth stage than in the late stage Hardness, bulk density and the ratio of solid phase in the soil after experiment were the highest in the fly ash treatment and those of control and zeolite treatments were showed the same trends each other. Amounts of water percoration of control and zeolite treatments in the soil were increased 8.2% and 2.6% respectively in comparision with those in the soil after amendment application, but that of fly ash treatment was decreased 42.5%, In contrast to the water percoration of control in the soil after experiment, those of fly ash and zeolite treatments were decreased 76% and 32%.

벼 건답직파(乾畓直播) 재배시(栽培時) 다량(多量) 소요(所要)되는 관개수량(灌漑水量)을 절감(節減)하기 위하여 석탄회(石炭灰) 5톤/10a 및 제오라이트 1톤/10a를 시용(施用)하고 그 효과(效果)를 구명(究明)하고자 배수(排水)가 매우 양호(良好)한 사양질(砂壤質)군 답토양(畓土壤)에서 시험한 결과는 다음과 같다. 감수심(減水深)은 담수초기(湛水初期)에 급격히 감소하여 관개후(灌漑後) 18일경(日頃)에 최소치(最少値)를 보인 후(後) 기온(氣溫)의 상승(上昇)과 벼 생육(生育)의 진전(進展)으로 다시 증가하는 경향을 보였으며, 전관개기간중(全灌漑期間中) H평균(平均) 감수심(減水深)은 무처리(無處理) 47.7, 석탄회(石炭灰) 시용구(施用區) 31.8, 제오라이트 시용구(試用區) 35.8mm/H 이었다. 시험후(試驗後) 토양(土壤)의 경도(硬度), 가비중(假比重) 및 고상율(固相率)은 석탄회구(石炭灰區)에서 가장 높았으며 무처리(無處理)와 제오라이트구(區)는 비슷한 경향이었다. 무처리 및 제오라이트구의 토양(土壤) 투수력(透水力)은 시용직후(施用直後)에 비(比)하여 시험후(試驗後) 토양(土壤)에서 각각 8.2%, 2.6% 증가(增加)된 반면 석탄회구(石炭灰區)에서는 42.5% 감소(減少)되었으며 시험후(試驗後) 토양(土壤)의 처리별(處理別) 투수력(透水力)은 무처리에 비하여 석탄회구는 76%, 제오라이트구는 32% 감소되었다. 전관개기간중(全灌漑期間中) 석탄회(石炭灰) 및 제오라이트구(區)의 퇴정(堆定) 관개수량(灌漑水量)은 무처리에 비하여 각각 30%, 20% 정도 감소되었으며 처리간(處理間) 일평균(日平均) 관개수량(灌漑水量)의 차이(差異)는 생육후기(生育後期)로 갈수록 적어졌다.