This experiment was conducted to establish proper irrigation method for water spinach, subtropical vegetable in plastic film house soils to prepare to future global warming of the Korean peninsula. The evaluation of irrigation with 4 different levels as −20, −40, −50 kPa as a starting point(water potential) were compared to –33 kPa as control. All treatments were ended when water potential reached at –10 kPa respectively. The amount of irrigated water, N content, plant growth and fresh yield were investigated. As a result, water potential was correlated positively with irrigation starting point in cultivation period and irrigation times, but the amount water irrigated per time, N content of harvested plant, fresh and dry yield showed negative correlation. The contents of crude protein, P, K, Ca, Fe of harvested part were most high in –50 kPa treatment. We concluded that –50 kPa was optimal irrigation starting point for water spinach cultivation in unheating plastic film house.

재료 및 방법
 결과 및 고찰
  관수회수, 관수량과 식물체 질소함량의 변화
  식물체 수분함량과 수량성 비교
  수확경엽의 조단백질과 무기성분함량 비교
 적 요
 REFERENCES

• 최병열(경기도농업기술원) | Byoung-Rourl Choi
• 박인태(경기도농업기술원) | In-Tae Park
• 조광래(경기도농업기술원) | Kwang-Rae Cho
• 주옥정(경기도농업기술원) | Ok-Jung Ju
• 김영순(경기도농업기술원) | Young-Soon Kim
• 김천환(국립원예특작과학원 온난화대응농업연구소) | Chun-Hwan Kim
• 성기철(국립원예특작과학원 온난화대응농업연구소) | Ki-Cheol Seong