국화 ‘백선’의 토양재배에서 관비주기와 시비량에 따른 절화의 생육과 토양 환경의 변화

Changes in Soil Environment and Growth of Cut Flower by Irrigation Interval and Fertilizer Level in Soil Culture of Dendranthema grandiflorum ‘Iwanohakusen’

This study was conducted to examine the effects of irrigation interval and fertilizer level on changes in soil chemical properties and growth of cut flower in soil retarding culture of standard chrysanthemum (Dendranthema grandiflorum) ‘Iwanohakusen’. The compound fertilizer (Poly-Feed, N-P-K 19-19-19) diluted with 1 gㆍL⁻¹ were treated by irrigation intervals of 1 time/1 day (1.5 Lㆍm⁻²), 1 time/2 days (1.5 Lㆍm⁻²), 2 times/3 days (3 Lㆍm⁻²) and 2 times/5 days (3 Lㆍm⁻²). As irrigation interval was long, the nutrient contents of soil decreased. In 1 time/1 day treatment, NO3-N, K, and P2O5 contents of soil decreased, but Ca and Mg contents of soil did not change than before planting. The growth of cut flower, such as stem length, stem diameter, fresh weight, and weight of flower was the best in 1 time/1 day treatment, and was the worst in 2 times/5 days treatment. To examine the proper fertilizer level, the compound fertilizers (Poly-Feed, N-P-K 19-19-19) of 0.2, 0.4, 0.8, and 1.6 kg per 1.5t water were treated 1 time/1 day in 1,000 m² field. In fertilizer level of 0.8 or 1.6 kg, EC and nutrient contents of soil were higher or similar than before planting, and inorganic salts in soil were accumulating continuously. The growth of cut flower, such as stem length, number of leaves, weight, and diameter of flower bud was more effective in fertilizer level of 0.4 kg, but it was the worst in excessive fertilizer level of 1.6 kg. Therefore, fertigation of 0.4 kg compound fertilizer with 1 time/1 day in 1,000 m² field was the most effective for reasonable soil management and cut flower production of high quality in retarding culture of standard chrysanthemum ‘Iwanohakusen’.