Effect of Drip Irrigation Level on Soil Salinity and Growth of Broccoli (Brassica oleracea L. var. italica) in Saemangeum Reclaimed Tidal Land

Abstract

The objective of this study was to investigate the effect of drip irrigation level on soil salinity and growth of broccoli (Brassica oleracea L. var. italica) at the 'Saemangeum Reclaimed Tidal Land' from April to June, 2015. Drip irrigation was conducted at 1.5, 3.0 and 6.0mm•day -1 level for reduction of resalinization in the plastic vinyl house using 10cm spacing drip irrigation tape. At harvesting stage, the average EC of surface soil was 10.9dS•m -1 for 1.5mm•day -1 , 11.5dS•m -1 for 3.0mm•day -1 and 5.1dS•m -1 for 6.0mm•day -1 and was significantly reduced by 52~56% in 6.0mm•day -1 treated plot compared to those in 1.5 and 3.0mm•day -1 plots. The fresh bud weights of 1.5, 3.0 and 6.0mm•day -1 treatment plots were 60.9, 129.1 and 371.3g•plant -1 , respectively. The estimated soil EC for 50% yield reduction was 7.6dS•m -1 and the desalinization depth by drip irrigation was 30~40cm in soil profile. The total amount of drip irrigation water was estimated to be 422mm and the daily drip irrigation level was 6.0mm•day -1 for the prevention of resalinization during the broccoli growing period at the 'Saemangeum Reclaimed Tidal Land'. Our results suggested that drip irrigation shows effectiveness on the lowering the soil salinity according to the drip irrigation quantity but it needs more research on this study because dynamics of salts in soil can vary with many factors such as soil physico-chemical properties and seasonal climate.

Growth Characteristics of Bell Pepper and Tomato Hydroponically Cultivated in Growth Media Containing Different NaCl Concentrations in Raw Water on Reclaimed Lands

“…Therefore, reclaimed soil is classified as a typical type of salt accumulation soil. The salt content in such soil, i.e., NaCl, increases due to the existence of nearby seawater (Bae et al, 2015).…”

Changes in Ridge Height and Maize Growth with Various Conservation Treatments Affected by Rainfall Characteristics in Saemangeum Reclaimed Land

“…지속적인 농지면적 감소와 정부의 간척지 이용 종합계획 발표 (MAFRA, 2019) 등으로 간척지 논을 벼 재배 외의 밭작물 재배에 이용하는 농지범용화에 대한 연구가 활발히 진행되어왔으며, 간척지에서 사료작물 등의 타 작물 재배 연구가 증가하고 있다 (KREI, 2014;Bae et al, 2018). 이와 함께 간척지에서의 밭작물 생산량 및 자급률 향상을 위한 노력도 진행되고 있으나 (Bae et al, 2015;Ryu et al, 2016;Lee et al, 2020) 해안이나 강 하구 등 평탄한 저지대에 주 로 위치하는 간척지 특성상 높은 지하수위와 배수불량에 의한 통기 부족으로 습해 발생 위험성이 높다 (Sohn et al, 2009b). 따라서 간척지에서 밭작물의 안정적인 생산을 위해서는 배수를 개선할 수 있는 기술의 개발이 매우 중요하다.…”

Managing Soil Organic Matter and Salinity by Crop Cultivation in Saemangeum Reclaimed Tidal Land

“…이는 간척지 토양 특성상 배수가 불량하고 재염화에 의한 염해 발생 등 밭작물 재배에 불리한 환경을 지니고 있기 때문이다. 그러나 최근 간척지의 다원적 활용을 위해 간 척지 밭작물 재배 및 토양 관리방법에 대한 연구가 활발히 진행되고 있다 (Bae et al, 2015;Ryu et al, 2016). 또한 논 에서 타 작물 재배 확대와 밭 식량작물 생산량 확대 정책 수립 등 밭작물 자급률 향상을 위한 다각적인 방안이 모색되 고 있다 (MAFRA, 2016).…”