Effect of Drainage Mix Ratio on Plant Growth of Cut Roses in a Closed System

Kwon, Oh-Keun; Yoo, Bong Sik; Lee, Su Young; Kim, So Young; Kim, Wonhee

doi:10.11623/frj.2016.24.4.08

Cited by 1 publication

(1 citation statement)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…그런데 작물의 무기이온 흡수는 기상조건이나 작물의 생장 단계 등 식물체의 자체변수 의해 이온간 흡수비율이 달라지므로 (Choi et al, 2008) EC 기준 제어로는 양액내 이온의 균형이 유 지되지는 않는 (Savvas & Manos, 1999) 문제가 있다. 따라서 주기적인 양액교체 (Lee et al, 2005;Ann & Son, 2011), 배액율 조절 (Ann et al, 2010), 원수 희석비율 (Kwon et al, 2014) 등을 통한 이온 불균형 완화 연구가 이루어졌으나 근본적인 문제를 해결할 수는 없었다.…”

unclassified

Control of Mg and P Ion Concentration as a Precondition to Use N, K and Ca Ion Sensors in Closed Hydroponics

Choi,

Yeo,

Rhee

et al. 2016

HST

View full text Add to dashboard Cite

Recycling nutrient solutions in closed hydroponic production systems is usually accompanied by an imbalance of nutrient solutions when concentration is controlled according to electrical conductivity (EC) levels. This study investigated whether it was possible to automatically control the concentrations of five essential elements nitrogen (N), phosphorus (P), potassium (K), calcium (Ca) and magnesium (Mg) using only N, K and Ca ion sensors. N, P, K, Ca, and Mg uptake was measured in the nutrient solution, and relationships between absorbed ions were analyzed through twice-repeated experiments in lettuce. Results confirmed that the pattern of PO4 ion uptake was similar that of N, and the pattern of Mg ion uptake was similar that of Ca. PO4 ion uptake was most highly correlated with N, and Mg was most highly correlated with Ca. Regression coefficients of N and PO4 were significantly different at 1.04 and 0.55, respectively, but were similar between Ca and Mg at 0.35 and 0.40, respectively. Additional experiments were conducted to measure nutrient uptake in pak choi and rose plants, both to confirm the results from the first experiment in lettuce, and to assess possible application to other crops. Coefficients of determination both for N and PO4, and Ca and Mg were considerably high (R 2 = 0.86) in cultured pak choi, and similar results were observed in cultured rose (R 2 = 0.87 and 0.73, respectively). Regression coefficients for cultured pak choi were 0.56 and 0.24, respectively, and for rose were 0.51 and 0.16, respectively. Although the results obtained for N and PO4 were not consistent between the lettuce experiments, N and PO4 have similar regression coefficients for all crops. No common coefficient was found between Ca and Mg.

show abstract

unclassified