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Effects of Subsurface Drip Irrigation and Aeration in Green Pepper Cultivation  

Kwon, Joon-Kook (Protected Horticulture Research Station, NIHHS, RDA)
Kang, Nam-Jun (Protected Horticulture Research Station, NIHHS, RDA)
Cho, Myeomg-Whan (Protected Horticulture Research Station, NIHHS, RDA)
Kang, Yun-Im (Protected Horticulture Research Station, NIHHS, RDA)
Park, Kyoung-Sub (Protected Horticulture Research Station, NIHHS, RDA)
Lee, Jae-Han (Planning & Coordination Division, NIHHS, RDA)
Publication Information
Journal of Bio-Environment Control / v.18, no.3, 2009 , pp. 225-231 More about this Journal
Abstract
'Nokkwang' green pepper plants were grown in soil system (silty loam with pH 6.5) under the greenhouse, to determine the effects of subsurface drip irrigation (SDI) and subsurface drip irrigation plus aeration (SDIA) into root zone comparing with conventional surface drip irrigation (DI) in terms of water use efficiency, soil properties, and growth and fruit yield. Two drip lines per crop row were layed on the soil surface in DI system, buried at a depth of 20cm below the soil surface in SDI system, and also buried at a depth of20cm below the soil surface and aerated for 3minutes a hour during the daytime ($08:00{\sim}19:00$) by a air compressor in SDIA system. A automatic irrigation with starting point of -20kPa and ending point of -10kPa based on soil moisture contents was applied by controllers and electronic vacum soil moisture sensors. Reduction in soil moisture contents was delayed in SDI and SDIA, compared to DI. Irrigation amount applied in pepper cultivation was around 30% less in SDI than in DI. Electric conductivity and nitrate nitrogen content in the surface soil grown green pepper were significantly lowered in SSDI and SDIA, compared to DI. Better development of root system was observed in SDIA and SDI than in DI. Results showed that pepper fruit yield increased by 30% in SDIA and 22% in SDI in comparision with DI.
Keywords
subsurface drip irrigation; aeration; green pepper; automatic irrigation;
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