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.

동절기 산취(Chamecereus silvestrii) ‘희망’의 주·야 온도를 달리하며 처리한 결과 초장은 주간온도 20oC와 야간온도 15oC에서 가장 크게 나타났다. 구경은 주간온도 25oC에서 구직경과 구고의 생육이 우수하였고, 주간온도 25oC에서는 모든 야간온도에서 구직경 생육이 양호하였으며 구고는 주간온도 25oC에서는 20oC에 비해 야간온도가 25oC로 높을수록 생육이 좋았다. 주·야간온도 조합의 합산온도가 높을수록 구직경과 구고신장이 증가하는 경향을 나타났다. 색도에서 Hunter ‘a’ 값은 야간온도가 높을수록 낮아졌으나 ‘b’ 값은 높아져 야간온도가 높으면 탁도가 증가하였다. 또 한 구직경과 구고변화의 증가가 다시 시작되는 기점은 정 식 후 15일로 나타났다.